1
|
Carey B, Wessling NK, Steeger P, Schmidt R, Michaelis de Vasconcellos S, Bratschitsch R, Arora A. Giant Faraday rotation in atomically thin semiconductors. Nat Commun 2024; 15:3082. [PMID: 38600090 PMCID: PMC11006678 DOI: 10.1038/s41467-024-47294-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 03/21/2024] [Indexed: 04/12/2024] Open
Abstract
Faraday rotation is a fundamental effect in the magneto-optical response of solids, liquids and gases. Materials with a large Verdet constant find applications in optical modulators, sensors and non-reciprocal devices, such as optical isolators. Here, we demonstrate that the plane of polarization of light exhibits a giant Faraday rotation of several degrees around the A exciton transition in hBN-encapsulated monolayers of WSe2 and MoSe2 under moderate magnetic fields. This results in the highest known Verdet constant of -1.9 × 107 deg T-1 cm-1 for any material in the visible regime. Additionally, interlayer excitons in hBN-encapsulated bilayer MoS2 exhibit a large Verdet constant (VIL ≈ +2 × 105 deg T-1 cm-2) of opposite sign compared to A excitons in monolayers. The giant Faraday rotation is due to the giant oscillator strength and high g-factor of the excitons in atomically thin semiconducting transition metal dichalcogenides. We deduce the complete in-plane complex dielectric tensor of hBN-encapsulated WSe2 and MoSe2 monolayers, which is vital for the prediction of Kerr, Faraday and magneto-circular dichroism spectra of 2D heterostructures. Our results pose a crucial advance in the potential usage of two-dimensional materials in ultrathin optical polarization devices.
Collapse
Affiliation(s)
- Benjamin Carey
- Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Strasse 10, Münster, Germany
- School of Mathematics and Physics, The University of Queensland, St Lucia, QLD, Australia
| | - Nils Kolja Wessling
- Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Strasse 10, Münster, Germany
- Institute of Photonics, Department of Physics, University of Strathclyde, 99 George Street, Glasgow, UK
| | - Paul Steeger
- Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Strasse 10, Münster, Germany
| | - Robert Schmidt
- Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Strasse 10, Münster, Germany
| | | | - Rudolf Bratschitsch
- Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Strasse 10, Münster, Germany.
| | - Ashish Arora
- Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Strasse 10, Münster, Germany.
- Department of Physics, Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune, Maharashtra, India.
| |
Collapse
|
2
|
Jiang J, McCartt AD. Mid-infrared trace detection with parts-per-quadrillion quantitation accuracy: Expanding frontiers of radiocarbon sensing. Proc Natl Acad Sci U S A 2024; 121:e2314441121. [PMID: 38513090 PMCID: PMC11009668 DOI: 10.1073/pnas.2314441121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 02/08/2024] [Indexed: 03/23/2024] Open
Abstract
Detection sensitivity is a critical characteristic to consider during selection of spectroscopic techniques. However, high sensitivity alone is insufficient for spectroscopic measurements in spectrally congested regions. Two-color cavity ringdown spectroscopy (2C-CRDS), based on intra-cavity pump-probe detection, simultaneously achieves high detection sensitivity and selectivity. This combination enables mid-infrared detection of radiocarbon dioxide ([Formula: see text]CO[Formula: see text]) molecules in room-temperature CO[Formula: see text] samples, with 1.4 parts-per-quadrillion (ppq, 10[Formula: see text]) sensitivity (average measurement precision) and 4.6-ppq quantitation accuracy (average calibrated measurement error for 21 samples from four separate trials) demonstrated on samples with [Formula: see text]C/C up to [Formula: see text]1.5[Formula: see text] natural abundance ([Formula: see text]1,800 ppq). These highly reproducible measurements, which are the most sensitive and quantitatively accurate in the mid-infrared, are accomplished despite the presence of orders-of-magnitude stronger, one-photon signals from other CO[Formula: see text] isotopologues. This is a major achievement in laser spectroscopy. A room-temperature-operated, compact, and low-cost 2C-CRDS sensor for [Formula: see text]CO[Formula: see text] benefits a wide range of scientific fields that utilize [Formula: see text]C for dating and isotope tracing, most notably atmospheric [Formula: see text]CO[Formula: see text] monitoring to track CO[Formula: see text] emissions from fossil fuels. The 2C-CRDS technique significantly enhances the general utility of high-resolution mid-infrared detection for analytical measurements and fundamental chemical dynamics studies.
Collapse
Affiliation(s)
- Jun Jiang
- Center for Accelerator Mass Spectrometry, Atmospheric, Earth, and Energy Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA94550
| | - A. Daniel McCartt
- Center for Accelerator Mass Spectrometry, Atmospheric, Earth, and Energy Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA94550
| |
Collapse
|
3
|
Cheng F, Zhao W, Fang B, Zhang Y, Yang N, Zhou H, Zhang W. High band-width mid-infrared frequency-modulated Faraday rotation spectrometer for time resolved measurement of the OH radical. OPTICS EXPRESS 2023; 31:25058-25069. [PMID: 37475319 DOI: 10.1364/oe.493270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 07/02/2023] [Indexed: 07/22/2023]
Abstract
We present a novel mid-infrared frequency-modulated Faraday rotation spectrometer (FM-FRS) for highly sensitive and high bandwidth detection of OH radicals in a photolysis reactor. High frequency modulation (up to 150 MHz) of the probe laser using an electro-optical modulator (EOM) was used to produce a modulation sideband on the laser output. An axial magnetic field was applied to the multi-pass Herriott cell, causing the linearly polarized light to undergo Faraday rotation. OH radicals were generated in the cell by photolyzing a mixture of ozone (O3) and water (H2O) with a UV laser pulse. The detection limit of OH reaches 6.8 × 108 molecule/cm3 (1σ, 0.2 ms) after 3 and falling to 8.0 × 107 molecule/cm3 after 100 event integrations. Relying on HITRAN absorption cross section and line shape data, this corresponds to minimum detectable fractional absorption (Amin) of 1.9 × 10-5 and 2.2 × 10-6, respectively. A higher signal-to-noise ratio and better long-term stability was achieved than with conventional FMS because the approach was immune to interference from diamagnetic species and residual amplitude modulation noise. To our knowledge, this work reports the first detection of OH in a photolysis reactor by FM-FRS in the mid-infrared region, a technique that will provide a new and alternative spectroscopic approach for the kinetic study of OH and other intermediate radicals.
Collapse
|
4
|
Dual-comb optical activity spectroscopy for the analysis of vibrational optical activity induced by external magnetic field. Nat Commun 2023; 14:883. [PMID: 36797264 PMCID: PMC9935641 DOI: 10.1038/s41467-023-36509-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Accepted: 02/03/2023] [Indexed: 02/18/2023] Open
Abstract
Optical activity (OA) spectroscopy is a powerful tool to characterize molecular chirality, explore the stereo-specific structure and study the solution-state conformation of biomolecules, which is widely utilized in the fields of molecular chirality, pharmaceutics and analytical chemistry. Due to the considerably weak effect, OA spectral analysis has high demands on measurement speed and sensitivity, especially for organic biomolecules. Moreover, gas-phase OA measurements require higher resolution to resolve Doppler-limited profiles. Here, we show the unmatched potential of dual-comb spectroscopy (DCS) in magnetic optical activity spectroscopy (MOAS) of gas-phase molecules with the resolution of hundred-MHz level and the high-speed measurement of sub-millisecond level. As a demonstration, we achieved the rapid, high-precision and high-resolution MOAS measurement of the nitrogen dioxide [Formula: see text]+[Formula: see text] band and the nitric oxide overtone band, which can be used to analyze fine structure of molecules. Besides, the preliminary demonstration of liquid-phase chiroptical activity (as weak as 10-5) has been achieved with several seconds of sampling time, which could become a routine approach enabling ultrafast dynamics analysis of chiral structural conformations.
Collapse
|
5
|
Gomółka G, Stępniewski G, Pysz D, Buczyński R, Klimczak M, Nikodem M. Highly sensitive methane detection using a mid-infrared interband cascade laser and an anti-resonant hollow-core fiber. OPTICS EXPRESS 2023; 31:3685-3697. [PMID: 36785355 DOI: 10.1364/oe.479963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 12/19/2022] [Indexed: 06/18/2023]
Abstract
For over a decade hollow-core fibers have been used in optical gas sensors in the role of gas cells. However, very few examples of actual real-life applications of those sensors have been demonstrated so far. In this paper, we present a highly-sensitive hollow-core fiber based methane sensor. Mid-infrared distributed feedback interband cascade laser operating near 3.27 µm is used to detect gas inside anti-resonant hollow-core fiber. R(3) line near 3057.71 cm-1 located in ν3 band of methane is targeted. Compact, lens-free optical setup with an all-silica negative curvature hollow-core fiber as the gas cell is demonstrated. Using wavelength modulation spectroscopy and 7.5-m-long fiber the detection limit as low as 1.54 ppbv (at 20 s) is obtained. The demonstrated system is applied for a week-long continuous monitoring of ambient methane and water vapor in atmospheric air at ground level. Diurnal cycles in methane concentrations are observed, what proves the sensor's usability in environmental monitoring.
Collapse
|
6
|
Cao Y, Liu K, Wang R, Gao X, Kang R, Fang Y, Chen W. NO 2 Sensor Based on Faraday Rotation Spectroscopy Using Ring Array Permanent Magnets. Anal Chem 2023; 95:1680-1685. [PMID: 36602469 DOI: 10.1021/acs.analchem.2c04821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Faraday rotation spectroscopy (FRS) exploits the magneto-optical effect to achieve highly selective and sensitive detection of paramagnetic molecules. Usually, a solenoid coil is used to provide a longitudinal magnetic field to produce the magneto-optical effect. However, such a method has the disadvantages of excessive power consumption and susceptibility to electromagnetic interference. In the present work, a novel FRS approach based on a combination of a neodymium iron boron permanent magnet ring array and a Herriott multipass absorption cell is proposed. A longitudinal magnetic field was generated by using 14 identical neodymium iron boron permanent magnet rings combined in a non-equidistant form according to their magnetic field's spatial distribution characteristics. The average magnetic field strength within a length of 380 mm was 346 gauss. A quantum cascade laser was used to target the optimum 441 ← 440 Q-branch nitrogen dioxide transition at 1613.25 cm-1 (6.2 μm) with an optical power of 40 mW. Coupling to a Herriott multipass absorption cell, a minimum detection limit of 0.4 ppb was achieved with an integration time of 70 s. The low-power FRS nitrogen dioxide sensor proposed in this work is expected to be developed into a robust field-deployable environment monitoring system.
Collapse
Affiliation(s)
- Yuan Cao
- HFIPS, Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, Hefei230031, China.,Advanced Laser Technology Laboratory of Anhui Province, Hefei230037, China
| | - Kun Liu
- HFIPS, Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, Hefei230031, China
| | - Ruifeng Wang
- University of Science and Technology of China, Hefei230031, China
| | - Xiaoming Gao
- HFIPS, Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, Hefei230031, China
| | - Ronghua Kang
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang110016, China
| | - Yunting Fang
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang110016, China
| | - Weidong Chen
- Laboratoire de Physicochimie de l'Atmosphère, Université du Littoral Côte d'Opale, 189A, Av. Maurice Schumann, Dunkerque59140, France
| |
Collapse
|
7
|
Carey B, Wessling NK, Steeger P, Klusmann C, Schneider R, Fix M, Schmidt R, Albrecht M, Michaelis de Vasconcellos S, Bratschitsch R, Arora A. High-Performance Broadband Faraday Rotation Spectroscopy of 2D Materials and Thin Magnetic Films. SMALL METHODS 2022; 6:e2200885. [PMID: 36228108 DOI: 10.1002/smtd.202200885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 09/21/2022] [Indexed: 06/16/2023]
Abstract
A Faraday rotation spectroscopy (FRS) technique is presented for measurements on the micrometer scale. Spectral acquisition speeds of about two orders of magnitude faster than state-of-the-art modulation spectroscopy setups are demonstrated. The experimental method is based on charge-coupled-device detection, avoiding speed-limiting components, such as polarization modulators with lock-in amplifiers. At the same time, FRS spectra are obtained with a sensitivity of 20 µrad ( 0.001 ° \[0.001{\bm{^\circ }}\] ) over a broad spectral range (525-800 nm), which is on par with state-of-the-art polarization-modulation techniques. The new measurement and analysis technique also automatically cancels unwanted Faraday rotation backgrounds. Using the setup, Faraday rotation spectroscopy of excitons is performed in a hexagonal boron nitride-encapsulated atomically thin semiconductor WS2 under magnetic fields of up to 1.4 T at room temperature and liquid helium temperature. An exciton g-factor of -4.4 ± 0.3 is determined at room temperature, and -4.2 ± 0.2 at liquid helium temperature. In addition, FRS and hysteresis loop measurements are performed on a 20 nm thick film of an amorphous magnetic Tb20 Fe80 alloy.
Collapse
Affiliation(s)
- Benjamin Carey
- Institute of Physics and Center for Nanotechnology, University of Münster, 48149, Münster, Germany
- School of Mathematics and Physics, The University of Queensland, Saint Lucia, QLD, 4072, Australia
| | - Nils Kolja Wessling
- Institute of Physics and Center for Nanotechnology, University of Münster, 48149, Münster, Germany
- Institute of Photonics, Department of Physics, University of Strathclyde, Glasgow, G1 1RD, UK
| | - Paul Steeger
- Institute of Physics and Center for Nanotechnology, University of Münster, 48149, Münster, Germany
| | - Christoph Klusmann
- Institute of Physics and Center for Nanotechnology, University of Münster, 48149, Münster, Germany
| | - Robert Schneider
- Institute of Physics and Center for Nanotechnology, University of Münster, 48149, Münster, Germany
| | - Mario Fix
- Institute of Physics, University of Augsburg, 86159, Augsburg, Germany
| | - Robert Schmidt
- Institute of Physics and Center for Nanotechnology, University of Münster, 48149, Münster, Germany
| | - Manfred Albrecht
- Institute of Physics, University of Augsburg, 86159, Augsburg, Germany
| | | | - Rudolf Bratschitsch
- Institute of Physics and Center for Nanotechnology, University of Münster, 48149, Münster, Germany
| | - Ashish Arora
- Institute of Physics and Center for Nanotechnology, University of Münster, 48149, Münster, Germany
- Department of Physics, Indian Institute of Science Education and Research, Pune, 411008, India
| |
Collapse
|
8
|
Quintero-Monsebaiz R, Perea-Ramírez LI, Piris M, Vela A. Spectroscopic properties of open shell diatomic molecules using Piris natural orbital functionals. Phys Chem Chem Phys 2021; 23:2953-2963. [PMID: 33480904 DOI: 10.1039/d0cp05430e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spectroscopic properties such as equilibrium distances, vibrational constants, rotational constants, dissociation energies, and excitation energies are calculated for nine heteronuclear diatomic molecules (PH, NF, NH, NO, CS, AlF, ClF, BeO and CF) using an interactive pair model (PNOF7s), that has been generalized for spin multiplet states, and its second order perturbation variant, NOF-MP2, which was also generalized for multiplets. The results obtained are compared with Complete Active Space (CASSCF) and Complete Active Space Perturbation Theory (CASPT2). It is shown that the potential energy curves provided by the PNOF functional for open shell diatomic molecules are in acceptable agreement with those from CASSCF and CASPT2. The spectroscopic constants depending at most on the second derivative of the potential energy are in good agreement with experiment, while those requiring the evaluation of the third and fourth derivatives show larger deviations from experiment and from those predicted by CASPT2. Thus, it is shown that the PNOF functional extension to multiplets is an alternative approach in predicting spectroscopic constants of molecules where static correlation plays an important role, like the open shell heteronuclear diatomic molecules studied in this work.
Collapse
Affiliation(s)
- Raúl Quintero-Monsebaiz
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Gustavo A. Madero, 07360 Ciudad de México, Mexico.
| | - Luis Ignacio Perea-Ramírez
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Gustavo A. Madero, 07360 Ciudad de México, Mexico.
| | - Mario Piris
- Donostia International Physics Center (DIPC), 20018 Donostia, Euskadi, Spain and Euskal Herriko Unibertsitatea (UPV/EHU), PK 1072, 20080 Donostia, Euskadi, Spain and Basque Foundation for Science (IKERBASQUE), Plaza Euskadi 5, 48009 Bilbao, Euskadi, Spain.
| | - Alberto Vela
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Gustavo A. Madero, 07360 Ciudad de México, Mexico.
| |
Collapse
|
9
|
Teng CC, Yan C, Rousso A, Zhong H, Chen T, Zhang EJ, Ju Y, Wysocki G. Time-resolved HO 2 detection with Faraday rotation spectroscopy in a photolysis reactor. OPTICS EXPRESS 2021; 29:2769-2779. [PMID: 33726467 DOI: 10.1364/oe.413063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
Faraday rotation spectroscopy (FRS) employs the Faraday effect to detect Zeeman splitting in the presence of a magnetic field. In this article, we present system design and implementation of radical sensing in a photolysis reactor using FRS. High sensitivity (100 ppb) and time resolved in situ HO2 detection is enabled with a digitally balanced acquisition scheme. Specific advantages of employing FRS for sensing in such dynamic environments are examined and rigorously compared to the more established conventional laser absorption spectroscopy (LAS). Experimental results show that FRS enables HO2 detection when LAS is deficient, and FRS compares favorably in terms of precision when LAS is applicable. The immunity of FRS to spectral interferences such as absorption of hydrocarbons and other diamagnetic species absorption and optical fringing are highlighted in comparison to LAS.
Collapse
|
10
|
Abbas MA, van Dijk L, Jahromi KE, Nematollahi M, Harren FJM, Khodabakhsh A. Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer. SENSORS (BASEL, SWITZERLAND) 2020; 20:E6831. [PMID: 33260402 PMCID: PMC7730292 DOI: 10.3390/s20236831] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 11/25/2020] [Accepted: 11/26/2020] [Indexed: 11/16/2022]
Abstract
Conventional mechanical Fourier Transform Spectrometers (FTS) can simultaneously measure absorption and dispersion spectra of gas-phase samples. However, they usually need very long measurement times to achieve time-resolved spectra with a good spectral and temporal resolution. Here, we present a mid-infrared dual-comb-based FTS in an asymmetric configuration, providing broadband absorption and dispersion spectra with a spectral resolution of 5 GHz (0.18 nm at a wavelength of 3333 nm), a temporal resolution of 20 μs, a total wavelength coverage over 300 cm-1 and a total measurement time of ~70 s. We used the dual-comb spectrometer to monitor the reaction dynamics of methane and ethane in an electrical plasma discharge. We observed ethane/methane formation as a recombination reaction of hydrocarbon radicals in the discharge in various static and dynamic conditions. The results demonstrate a new analytical approach for measuring fast molecular absorption and dispersion changes and monitoring the fast dynamics of chemical reactions over a broad wavelength range, which can be interesting for chemical kinetic research, particularly for the combustion and plasma analysis community.
Collapse
Affiliation(s)
- Muhammad Ali Abbas
- Trace Gas Research Group, Department of Molecular and Laser Physics, Institute of Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The Netherlands; (L.v.D.); (K.E.J.); (M.N.); (F.J.M.H.); (A.K.)
| | | | | | | | | | | |
Collapse
|
11
|
Wei N, Fang B, Zhao W, Wang C, Yang N, Zhang W, Chen W, Fittschen C. Time-Resolved Laser-Flash Photolysis Faraday Rotation Spectrometer: A New Tool for Total OH Reactivity Measurement and Free Radical Kinetics Research. Anal Chem 2020; 92:4334-4339. [PMID: 31984730 DOI: 10.1021/acs.analchem.9b05117] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The total OH reactivity (kOH') is an important parameter for quantitative assessment of the atmospheric oxidation capacity. Although laboratory measurement of kOH' has been achieved 20 years ago, the instruments required are often costly and complex. Long-term atmospheric observations remain challenging and elusive. In this work, a novel instrument combining laser-flash photolysis with a mid-infrared Faraday rotation spectrometer (LFP-FRS) has been developed for the measurement of kOH' and for studying gas phase free radical kinetics. The reactor is composed of a Herriott-type optical multipass cell, and OH radicals were generated by flash photolysis of ozone with a 266 nm pulsed Nd:YAG laser. The decay of the OH signal was directly measured with a time-resolved FRS spectrometer at 2.8 μm. The overlapping path length between the pump beam and probe beam was 25 m. High performance was achieved by subtracting the signals before and after flash photolysis to eliminate interferences caused by H2O absorption and background drift. The optimum precisions (1σ) of OH concentration and kOH' measurement were 4 × 106 molecules cm-3 and 0.09 s-1 over data acquisition times of 56 and 112 s, respectively. The performance of the system was evaluated by the reaction of OH with CO and NO. The measured rate coefficients (kOH+CO and kOH+NO) were in good agreement with values reported in the literature. The developed LFP-FRS provides a new, high precision, and highly selective tool for atmospheric chemistry research of OH radicals and other transient paramagnetic free radicals such as HO2 radicals.
Collapse
Affiliation(s)
- Nana Wei
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui China.,University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Bo Fang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui China.,University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Weixiong Zhao
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui China
| | - Chunhui Wang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui China.,University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Nana Yang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui China.,University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Weijun Zhang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui China.,University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Weidong Chen
- Laboratoire de Physicochimie de l'Atmosphère, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - Christa Fittschen
- Université Lille, CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| |
Collapse
|
12
|
Heffler E, Carpagnano GE, Favero E, Guida G, Maniscalco M, Motta A, Paoletti G, Rolla G, Baraldi E, Pezzella V, Piacentini G, Nardini S. Fractional Exhaled Nitric Oxide (FENO) in the management of asthma: a position paper of the Italian Respiratory Society (SIP/IRS) and Italian Society of Allergy, Asthma and Clinical Immunology (SIAAIC). Multidiscip Respir Med 2020; 15:36. [PMID: 32269772 PMCID: PMC7137762 DOI: 10.4081/mrm.2020.36] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 02/05/2020] [Indexed: 02/08/2023] Open
Abstract
Asthma prevalence in Italy is on the rise and is estimated to be over 6% of the general population. The diagnosis of asthma can be challenging and elusive, especially in children and the last two decades has brought evidences that asthma is not a single disease but consists of various phenotypes. Symptoms can be underestimated by the patient or underreported to the clinician and physical signs can be scanty. Usual objective measures, like spirometry, are necessary but sometimes not significant. Despite proper treatment, asthma can be a very severe condition (even leading to death), however new drugs have recently become available which can be very effective in its control. Since asthma is currently thought to be caused by inflammation, a direct measure of the latter can be of paramount importance. For this purpose, the measurement of Fractional Exhaled Nitric Oxide (FENO) has been used since the early years of the current century as a non-invasive, easy-to-assess tool useful for diagnosing and managing asthma. This SIP-IRS/SIAAIC Position Paper is a narrative review which summarizes the evidence behind the usefulness of FENO in the diagnosis, management and phenotypization of asthma.
Collapse
Affiliation(s)
- Enrico Heffler
- Personalized Medicine, Asthma and Allergy, Humanitas Clinical and Research Center IRCCS, Rozzano (MI).,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele (MI)
| | - Giovanna Elisiana Carpagnano
- Department of Medical and Surgical Sciences, University of Foggia; Section of Respiratory Diseases, Hospital d'Avanzo, Foggia
| | - Elisabetta Favero
- Department of Medicine-DIMED, Immunological and Respiratory Rare Disease, Allergologic Clinic Ca' Foncello Hospital, Treviso
| | - Giuseppe Guida
- Allergy and Pneumology Unit, A.O. S. Croce e Carle, Cuneo
| | - Mauro Maniscalco
- Respiratory Rehabilitation Unit, ICS Maugeri, Institute of Telese Terme IRCCS
| | - Andrea Motta
- Institute of Biomolecular Chemistry, National Research Council, Pozzuoli (NA)
| | - Giovanni Paoletti
- Personalized Medicine, Asthma and Allergy, Humanitas Clinical and Research Center IRCCS, Rozzano (MI).,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele (MI)
| | - Giovanni Rolla
- Allergy and Clinical Immunology, University of Turin and A.O. Mauriziano, Turin
| | - Eugenio Baraldi
- Department of Woman's and Child's Health, University Hospital of Padua
| | - Vincenza Pezzella
- Department of Woman, Child and of General and Specialized Surgery, University of Campania "Luigi Vanvitelli", Naples
| | - Giorgio Piacentini
- Paediatric Section, Department of Surgery, Dentistry, Paediatrics and Gynaecology, University of Verona
| | - Stefano Nardini
- Italian Respiratory Society-Società Italiana di Pneumologia, Milan, Italy
| |
Collapse
|
13
|
Fang B, Yang NN, Wang CH, Zhao WX, Xu XZ, Zhang Y, Zhang WJ. Detection of nitric oxide with Faraday rotation spectroscopy at 5.33 µm. CHINESE J CHEM PHYS 2020. [DOI: 10.1063/1674-0068/cjcp1910182] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Bo Fang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Na-na Yang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Chun-hui Wang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China
| | - Wei-xiong Zhao
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
| | - Xue-zhe Xu
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
| | - Yang Zhang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
| | - Wei-jun Zhang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China
| |
Collapse
|
14
|
Gianella M, Press SA, Manfred KM, Norman HC, Islam M, Ritchie GAD. Sensitive detection of HO radicals produced in an atmospheric pressure plasma using Faraday rotation cavity ring-down spectroscopy. J Chem Phys 2019; 151:124202. [PMID: 31575168 DOI: 10.1063/1.5119191] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Cavity ring-down spectroscopy (CRDS) is a well-established, highly sensitive absorption technique whose sensitivity and selectivity for trace radical sensing can be further enhanced by measuring the polarization rotation of the intracavity light by the paramagnetic samples in the presence of a magnetic field. In this paper, we highlight the use of this Faraday rotation cavity ring-down spectroscopy (FR-CRDS) for the detection of HO2 radicals. In particular, we use a cold atmospheric pressure plasma jet as a highly efficient source of HO2 radicals and show that FR-CRDS in the near-infrared spectral region (1506 nm) has the potential to be a useful tool for studying radical chemistry. By simultaneously measuring ring-down times of orthogonal linearly polarized light, measurements of Faraday effect-induced rotation angles (θ) and absorption coefficients (α) are retrieved from the same data set. The Faraday rotation measurement exhibits better long-term stability and enhanced sensitivity due to its differential nature, whereby highly correlated noise between the two channels and slow drifts cancel out. The bandwidth-normalized sensitivities are αmin=2.2×10-11 cm-1 Hz-1/2 and θmin=0.62 nrad Hz-1/2. The latter corresponds to a minimum detectable (circular) birefringence of Δnmin=5×10-16 Hz-1/2. Using the overlapping qQ3(N = 4-9) transitions of HO2, we estimate limits of detection of 3.1 × 108 cm-3 based on traditional (absorption) CRDS methods and 6.7 × 107 cm-3 using FR-CRDS detection, where each point of the spectrum was acquired during 2 s. In addition, Verdet constants for pertinent carrier (He, Ar) and bulk (N2, O2) gases were recorded in this spectral region for the first time. These show good agreement with recent measurements of air and values extrapolated from reported Verdet constants at shorter wavelengths, demonstrating the potential of FR-CRDS for measurements of very weak Faraday effects and providing a quantitative validation to the computed rotation angles.
Collapse
Affiliation(s)
- Michele Gianella
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Rd., Oxford OX1 3QZ, United Kingdom
| | - Sioned A Press
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Rd., Oxford OX1 3QZ, United Kingdom
| | - Katherine M Manfred
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Rd., Oxford OX1 3QZ, United Kingdom
| | - Helen C Norman
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Rd., Oxford OX1 3QZ, United Kingdom
| | - Meez Islam
- School of Science, Engineering and Design, Teesside University, Borough Road, Middlesbrough TS1 3BA, United Kingdom
| | - Grant A D Ritchie
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Rd., Oxford OX1 3QZ, United Kingdom
| |
Collapse
|
15
|
Patrick CL, Westberg J, Wysocki G. Cavity Attenuated Phase Shift Faraday Rotation Spectroscopy. Anal Chem 2019; 91:1696-1700. [PMID: 30562454 DOI: 10.1021/acs.analchem.8b04359] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cavity attenuated phase shift Faraday rotation spectroscopy has been developed and demonstrated by oxygen detection near 762 nm. The system incorporates a high-finesse cavity together with phase-sensitive balanced polarimetric detection for sensitivity enhancement and achieves a minimum detectable polarization rotation angle (1σ) of 5.6 × 10-9 rad/√Hz, which corresponds to an absorption sensitivity of 4.5 × 10-10 cm-1/√Hz without the need for high sampling rate data acquisition. The technique is insusceptible to spectral interferences, which makes it highly suitable for chemical trace gas detection of paramagnetic molecules such as nitric oxide, nitrogen dioxide, oxygen, and the hydroxyl/hydroperoxyl radicals.
Collapse
Affiliation(s)
- Charles Link Patrick
- Department of Electrical Engineering , Princeton University , Princeton , New Jersey 08544 , United States
| | - Jonas Westberg
- Department of Electrical Engineering , Princeton University , Princeton , New Jersey 08544 , United States
| | - Gerard Wysocki
- Department of Electrical Engineering , Princeton University , Princeton , New Jersey 08544 , United States
| |
Collapse
|
16
|
Liu J, Zhou Y, Guo S, Hou J, Zhao G, Ma W, Wu Y, Dong L, Zhang L, Yin W, Xiao L, Axner O, Jia S. A novel methodology to directly pre-determine the relative wavelength response of DFB laser in wavelength modulation spectroscopy. OPTICS EXPRESS 2019; 27:1249-1261. [PMID: 30696194 DOI: 10.1364/oe.27.001249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 12/07/2018] [Indexed: 06/09/2023]
Abstract
A novel methodology to directly pre-determine the relative wavelength response (RWR) of a DFB laser, in terms of a combined current linearly scanned wavelength response and current modulated wavelength response (CMWR), in wavelength modulation spectroscopy (WMS) is presented. It is shown that the assessed RWR can be used to mimic the measured response with standard deviation of discriminations that are below 3.4 × 10-3cm-1 under a variety of conditions. It is also shown that its performance supersedes two commonly used assessment models of the CMWR but is slightly worse than that of the third model, however with the benefit of solely using a single fitting parameter (the concentration) instead of more. When the novel method is applied to the assessment of CO2 concentration in a Herriot-type multipass cell by using the technique of calibration-free WMS, the results show that there is virtually no difference compared to that by use of the best of the other methods. It is concluded that the novel method is more robust and simplifies the retrieval process of gas concentration.
Collapse
|
17
|
Montilla-Bascón G, Mandon J, Harren FJM, Mur LAJ, Cristescu SM, Prats E. Quantum Cascade Lasers-Based Detection of Nitric Oxide. Methods Mol Biol 2019; 1747:49-57. [PMID: 29600450 DOI: 10.1007/978-1-4939-7695-9_5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Despite the established importance of nitric oxide (NO) in many physiological and molecular processes in plants, most methods for quantifying NO are open to criticism This reflects the differing methods either lacking specificity or sensitivity, or even from an undue dependence of results on experimental conditions (i.e., chemical concentrations, pH, etc.). In this chapter we describe a protocol to measure gaseous NO produced by a biological sample using quantum cascade laser (QCL)-based spectroscopy. This technique is based on absorption of the laser light by the NO molecules which have been passed from a biological sample into an optical s cell that is equipped with two mirrors placed at both ends. This design greatly increases the interaction path length with the NO molecules due to multiple reflections of the light coupled inside the cell. Thus, the method is able to provide online, in planta measurements of the dynamics of NO production, being highly selective and sensitive (down to ppbv levels;1 ppbv = part per billion by volume mixing ratio = 1:10-9).
Collapse
Affiliation(s)
- Gracia Montilla-Bascón
- Institute for Sustainable Agriculture, Spanish Council for Scientific Research (CSIC), Córdoba, Spain
| | - Julien Mandon
- Department of Molecular and Laser Physics, Radboud University, Nijmegen, The Netherlands
| | - Frans J M Harren
- Department of Molecular and Laser Physics, Radboud University, Nijmegen, The Netherlands
| | - Luis A J Mur
- Institute of Biological, Environmental and Rural Sciences, University of Aberystwyth, Aberystwyth, UK
| | - Simona M Cristescu
- Department of Molecular and Laser Physics, Radboud University, Nijmegen, The Netherlands
| | - Elena Prats
- Institute for Sustainable Agriculture, Spanish Council for Scientific Research (CSIC), Córdoba, Spain.
| |
Collapse
|
18
|
Pinto THP, Gianella M, Ritchie GAD. Optical saturation effects in intracavity Faraday modulation spectroscopy (INFAMOS). J Chem Phys 2018; 149:174202. [PMID: 30408999 DOI: 10.1063/1.5040577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report on the observation of saturation effects in Intracavity Faraday Modulation Spectroscopy (INFAMOS). A quantum cascade laser operating at ∼5.3 μm is used to probe the 2Π3/2 and 2Π1/2 R(3.5) transitions in the fundamental band of nitric oxide. With average intracavity intensities up to 450 W cm-2, the saturation of these molecular transitions is observed up to a total pressure of ∼240 Torr. The experimental data are interpreted by incorporating saturation into a model for the INFAMOS line shape in the homogeneously broadened limit.
Collapse
Affiliation(s)
- Tomás H P Pinto
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Michele Gianella
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Grant A D Ritchie
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| |
Collapse
|
19
|
Richard L, Romanini D, Ventrillard I. Nitric Oxide Analysis Down to ppt Levels by Optical-Feedback Cavity-Enhanced Absorption Spectroscopy. SENSORS (BASEL, SWITZERLAND) 2018; 18:E1997. [PMID: 29932103 PMCID: PMC6068816 DOI: 10.3390/s18071997] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 06/18/2018] [Accepted: 06/19/2018] [Indexed: 02/03/2023]
Abstract
Monitoring nitric oxide at the trace level is required in a large range of applications. We report on a trace gas analyzer optimized for nitric oxide measurements by Optical Feedback Cavity Enhanced Absorption Spectroscopy with an interband cascade laser at 5.3 µm. The short response time of the instrument allows for reaching the level of 50 ppt in only 180 ms. Its stability enables averaging up to 12 min to reach a detection limit of 0.9 ppt. Absolute concentration calibration requires to account for the optical saturation effect that results from the intense absorption line intensity addressed here, in the mid infrared region, in contrast to instruments that are operating in the near infrared region.
Collapse
Affiliation(s)
- Lucile Richard
- LIPhy, University Grenoble Alpes, CNRS, F-38000 Grenoble, France.
| | - Daniele Romanini
- LIPhy, University Grenoble Alpes, CNRS, F-38000 Grenoble, France.
| | | |
Collapse
|
20
|
Zhao W, Fang B, Lin X, Gai Y, Zhang W, Chen W, Chen Z, Zhang H, Chen W. Superconducting-Magnet-Based Faraday Rotation Spectrometer for Real Time in Situ Measurement of OH Radicals at 10 6 Molecule/cm 3 Level in an Atmospheric Simulation Chamber. Anal Chem 2018; 90:3958-3964. [PMID: 29490135 DOI: 10.1021/acs.analchem.7b04949] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Atmospheric simulation chambers play vital roles in the validation of chemical mechanisms and act as a bridge between field measurements and modeling. Chambers operating at atmospheric levels of OH radicals (106-107 molecule/cm3) can significantly enhance the possibility for investigating the discrepancies between the observation and model predications. However, few chambers can directly detect chamber OH radicals at ambient levels. In this paper, we report on the first combination of a superconducting magnet with midinfrared Faraday rotation spectroscopy (FRS) for real time in situ measurement of the OH concentration in an atmospheric simulation chamber. With the use of a multipass enhanced FRS, a detection limit of 3.2 × 106 OH/cm3 (2σ, 4 s) was achieved with an absorption path length of 108 m. The developed FRS system provided a unique, self-calibrated analytical instrument for in situ direct measurement of chamber OH concentration.
Collapse
Affiliation(s)
- Weixiong Zhao
- Laboratory of Atmospheric Physico-Chemistry , Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences , Hefei 230031 , Anhui , China
| | - Bo Fang
- Laboratory of Atmospheric Physico-Chemistry , Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences , Hefei 230031 , Anhui , China
| | - Xiaoxiao Lin
- Laboratory of Atmospheric Physico-Chemistry , Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences , Hefei 230031 , Anhui , China
| | - Yanbo Gai
- Laboratory of Atmospheric Physico-Chemistry , Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences , Hefei 230031 , Anhui , China
| | - Weijun Zhang
- Laboratory of Atmospheric Physico-Chemistry , Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences , Hefei 230031 , Anhui , China.,School of Environmental Science and Optoelectronic Technology , University of Science and Technology of China , Hefei 230026 , Anhui , China
| | - Wenge Chen
- High Magnetic Field Laboratory , Chinese Academy of Sciences , Hefei 230031 , Anhui , China
| | - Zhiyou Chen
- High Magnetic Field Laboratory , Chinese Academy of Sciences , Hefei 230031 , Anhui , China
| | - Haifeng Zhang
- Vacree Technologies Co., Ltd. , Hefei 230088 , Anhui , China
| | - Weidong Chen
- Laboratoire de Physicochimie de l'Atmosphère , Université du Littoral Côte d'Opale , 59140 Dunkerque , France
| |
Collapse
|
21
|
Wu K, Feng Y, Li J, Yu G, Liu L, Xiong Y, Li F. Demonstration of a mid-infrared NO molecular Faraday optical filter. OPTICS EXPRESS 2017; 25:30916-30930. [PMID: 29245771 DOI: 10.1364/oe.25.030916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 11/21/2017] [Indexed: 06/07/2023]
Abstract
A molecular Faraday optical filter (MFOF) working in the mid-infrared region is realized for the first time. NO molecule was used as the working material of the MFOF for potential applications in atmospheric remote sensing and combustion diagnosis. We develop a complete theory to describe the performance of MFOF by taking both Zeeman absorption and Faraday rotation into account. We also record the Faraday rotation transmission (FRT) signal using a quantum cascade laser over the range of 1,820 cm-1 to 1,922 cm-1 and calibrate it by using a 101.6 mm long solid germanium etalon with a free spectral range of 0.012 cm-1. Good agreement between the simulation results and experimental data is achieved. The NO-MFOF's transmission characteristics as a function of magnetic field and pressure are studied in detail. Both Comb-like FRT spectrum and single branch transmission spectrum are obtained by changing the magnetic field. The diversity of FRT spectrum expands the range of potential applications in infrared optical remote sensing. This filtering method can also be extended to the lines of other paramagnetic molecules.
Collapse
|
22
|
Gianella M, Pinto THP, Wu X, Ritchie GAD. Intracavity Faraday modulation spectroscopy (INFAMOS): A tool for radical detection. J Chem Phys 2017; 147:054201. [PMID: 28789542 DOI: 10.1063/1.4985900] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
We present the intra-cavity Faraday modulation spectroscopy technique, whereby optical feedback cavity-enhanced spectroscopy is coupled with Faraday modulation spectroscopy to greatly enhance the interaction path length of a laser beam with a paramagnetic sample in a magnetic field. We describe a first prototype based upon a cw quantum cascade laser targeting a selection of fundamental rovibrational R-branch transitions of nitric oxide (1890 cm-1), consisting of a linear cavity (finesse F=6300) and a water-cooled solenoid. We demonstrate a minimum detectable Verdet constant of Vmin=4.7×10-14 rad cm-1 G-1 Hz-1/2 (at SNR = 1), corresponding to a single-pass rotation angle of 1.6×10-10 rad Hz-1/2 and a limit of detection of 0.21 ppbv Hz-1/2 NO.
Collapse
Affiliation(s)
- Michele Gianella
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Tomas H P Pinto
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Xia Wu
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Grant A D Ritchie
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| |
Collapse
|
23
|
Liu X, Chae I, Miriyala N, Lee D, Thundat T, Kim S. Broadband Mid-Infrared Stand-Off Reflection-Absorption Spectroscopy Using a Pulsed External Cavity Quantum Cascade Laser. APPLIED SPECTROSCOPY 2017; 71:1494-1505. [PMID: 28664781 DOI: 10.1177/0003702817693233] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Broadband mid-infrared molecular spectroscopy is essential for detection and identification of many chemicals and materials. In this report, we present stand-off mid-infrared spectra of 1,3,5-trinitro-1,3,5-triazine or cyclotrimethylene trinitramine (RDX) residues on a stainless-steel surface measured by a broadband external cavity quantum cascade laser (QCL) system. The pulsed QCL is continuously scanned over 800 cm-1 in the molecular fingerprint region and the amplitude of the reflection signal is measured by either a boxcar-averager-based scheme or a lock-in-amplifier-based scheme with 1 MHz and 100 kHz quartz crystal oscillators. The main background noise is due to the laser source instability and is around 0.1% of normalized intensity. The direct absorption spectra have linewidth resolution around 0.1 cm-1 and peak height sensitivity around 10-2 due to baseline interference fringes. Stand-off detection of 5-50 µg/cm2 of RDX trace adsorbed on a stainless steel surface at the distance of 5 m is presented.
Collapse
Affiliation(s)
- Xunchen Liu
- 1 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Inseok Chae
- 2 Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Naresh Miriyala
- 2 Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Dongkyu Lee
- 3 Daegu Research Center for Medical Devices, Korea Institute of Machinery & Materials (KIMM), Daegu, Republic of Korea
| | - Thomas Thundat
- 2 Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Seonghwan Kim
- 4 Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB, Canada
| |
Collapse
|
24
|
Horváth I, Barnes PJ, Loukides S, Sterk PJ, Högman M, Olin AC, Amann A, Antus B, Baraldi E, Bikov A, Boots AW, Bos LD, Brinkman P, Bucca C, Carpagnano GE, Corradi M, Cristescu S, de Jongste JC, Dinh-Xuan AT, Dompeling E, Fens N, Fowler S, Hohlfeld JM, Holz O, Jöbsis Q, Van De Kant K, Knobel HH, Kostikas K, Lehtimäki L, Lundberg J, Montuschi P, Van Muylem A, Pennazza G, Reinhold P, Ricciardolo FLM, Rosias P, Santonico M, van der Schee MP, van Schooten FJ, Spanevello A, Tonia T, Vink TJ. A European Respiratory Society technical standard: exhaled biomarkers in lung disease. Eur Respir J 2017; 49:49/4/1600965. [PMID: 28446552 DOI: 10.1183/13993003.00965-2016] [Citation(s) in RCA: 362] [Impact Index Per Article: 51.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 01/09/2017] [Indexed: 12/19/2022]
Abstract
Breath tests cover the fraction of nitric oxide in expired gas (FeNO), volatile organic compounds (VOCs), variables in exhaled breath condensate (EBC) and other measurements. For EBC and for FeNO, official recommendations for standardised procedures are more than 10 years old and there is none for exhaled VOCs and particles. The aim of this document is to provide technical standards and recommendations for sample collection and analytic approaches and to highlight future research priorities in the field. For EBC and FeNO, new developments and advances in technology have been evaluated in the current document. This report is not intended to provide clinical guidance on disease diagnosis and management.Clinicians and researchers with expertise in exhaled biomarkers were invited to participate. Published studies regarding methodology of breath tests were selected, discussed and evaluated in a consensus-based manner by the Task Force members.Recommendations for standardisation of sampling, analysing and reporting of data and suggestions for research to cover gaps in the evidence have been created and summarised.Application of breath biomarker measurement in a standardised manner will provide comparable results, thereby facilitating the potential use of these biomarkers in clinical practice.
Collapse
Affiliation(s)
- Ildiko Horváth
- Dept of Pulmonology, National Korányi Institute of Pulmonology, Budapest, Hungary
| | - Peter J Barnes
- National Heart and Lung Institute, Imperial College London, Royal Brompton Hospital, London, UK
| | | | - Peter J Sterk
- Dept of Respiratory Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Marieann Högman
- Centre for Research & Development, Uppsala University/Gävleborg County Council, Gävle, Sweden
| | - Anna-Carin Olin
- Occupational and Environmental Medicine, Sahlgrenska Academy and University Hospital, Goteborg, Sweden
| | - Anton Amann
- Innsbruck Medical University, Innsbruck, Austria
| | - Balazs Antus
- Dept of Pathophysiology, National Korányi Institute of Pulmonology, Budapest, Hungary
| | | | - Andras Bikov
- Dept of Pulmonology, Semmelweis University, Budapest, Hungary
| | - Agnes W Boots
- Dept of Pharmacology and Toxicology, University of Maastricht, Maastricht, The Netherlands
| | - Lieuwe D Bos
- Intensive Care, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Paul Brinkman
- Dept of Respiratory Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Caterina Bucca
- Biomedical Sciences and Human Oncology, Universita' di Torino, Turin, Italy
| | | | | | - Simona Cristescu
- Dept of Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands
| | - Johan C de Jongste
- Dept of Pediatrics/Respiratory Medicine, Erasmus MC-Sophia Childrens' Hospital, Rotterdam, The Netherlands
| | | | - Edward Dompeling
- Dept of Paediatrics/Family Medicine Research School CAPHRI, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Niki Fens
- Dept of Respiratory Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Stephen Fowler
- Respiratory Research Group, University of Manchester Wythenshawe Hospital, Manchester, UK
| | - Jens M Hohlfeld
- Clinical Airway Research, Fraunhofer Institute of Toxicology and Experimental Medicine (ITEM), Hannover, Germany.,Medizinische Hochschule Hannover, Hannover, Germany
| | - Olaf Holz
- Clinical Airway Research, Fraunhofer Institute of Toxicology and Experimental Medicine (ITEM), Hannover, Germany
| | - Quirijn Jöbsis
- Department of Paediatric Respiratory Medicine, Maastricht University Medical Centre (MUMC+), Maastricht, The Netherlands
| | - Kim Van De Kant
- Dept of Paediatrics/Family Medicine Research School CAPHRI, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Hugo H Knobel
- Philips Research, High Tech Campus 11, Eindhoven, The Netherlands
| | | | | | - Jon Lundberg
- Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Paolo Montuschi
- Pharmacology, Catholic University of the Sacred Heart, Rome, Italy
| | - Alain Van Muylem
- Hopital Erasme Cliniques Universitaires de Bruxelles, Bruxelles, Belgium
| | - Giorgio Pennazza
- Faculty of Engineering, University Campus Bio-Medico, Rome, Italy
| | - Petra Reinhold
- Institute of Molecular Pathogenesis, Friedrich Loeffler Institut, Jena, Germany
| | - Fabio L M Ricciardolo
- Clinic of Respiratory Disease, Dept of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | - Philippe Rosias
- Dept of Paediatrics/Family Medicine Research School CAPHRI, Maastricht University Medical Centre, Maastricht, The Netherlands.,Dept of Pediatrics, Maasland Hospital, Sittard, The Netherlands
| | - Marco Santonico
- Faculty of Engineering, University Campus Bio-Medico, Rome, Italy
| | - Marc P van der Schee
- Dept of Respiratory Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | | | | | - Thomy Tonia
- European Respiratory Society, Lausanne, Switzerland
| | - Teunis J Vink
- Philips Research, High Tech Campus 11, Eindhoven, The Netherlands
| |
Collapse
|
25
|
Wojtas J, Gluszek A, Hudzikowski A, Tittel FK. Mid-Infrared Trace Gas Sensor Technology Based on Intracavity Quartz-Enhanced Photoacoustic Spectroscopy. SENSORS 2017; 17:s17030513. [PMID: 28273836 PMCID: PMC5375799 DOI: 10.3390/s17030513] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 02/24/2017] [Accepted: 03/02/2017] [Indexed: 01/31/2023]
Abstract
The application of compact inexpensive trace gas sensor technology to a mid-infrared nitric oxide (NO) detectoion using intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) is reported. A minimum detection limit of 4.8 ppbv within a 30 ms integration time was demonstrated by using a room-temperature, continuous-wave, distributed-feedback quantum cascade laser (QCL) emitting at 5.263 µm (1900.08 cm-1) and a new compact design of a high-finesse bow-tie optical cavity with an integrated resonant quartz tuning fork (QTF). The optimum configuration of the bow-tie cavity was simulated using custom software. Measurements were performed with a wavelength modulation scheme (WM) using a 2f detection procedure.
Collapse
Affiliation(s)
- Jacek Wojtas
- Institute of Optoelectronics, Military University of Technology, 00-908 Warsaw, Poland.
| | - Aleksander Gluszek
- Electronics Faculty, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland.
| | - Arkadiusz Hudzikowski
- Electronics Faculty, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland.
| | - Frank K Tittel
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005-1892, USA.
| |
Collapse
|
26
|
|
27
|
De A, Banik GD, Maity A, Pal M, Pradhan M. Continuous wave external-cavity quantum cascade laser-based high-resolution cavity ring-down spectrometer for ultrasensitive trace gas detection. OPTICS LETTERS 2016; 41:1949-1952. [PMID: 27128046 DOI: 10.1364/ol.41.001949] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A high-resolution cavity ring-down spectroscopic (CRDS) system based on a continuous wave (cw) mode-hop-free (MHF) external-cavity quantum cascade laser (EC-QCL) operating at λ∼5.2 μm has been developed for ultrasensitive detection of nitric oxide (NO). We report the performance of the high-resolution EC-QCL based cw-CRDS instrument by measuring the rotationally resolved Λ-doublet e and f components of the P(7.5) line in the fundamental band of NO at 1850.169 cm-1 and 1850.179 cm-1. A noise-equivalent absorption coefficient of 1.01×10-9 cm-1 Hz-1/2 was achieved based on an empty cavity ring-down time of τ0=5.6 μs and standard deviation of 0.11% with averaging of six ring-down time determinations. The CRDS sensor demonstrates the advantages of measuring parts per billion NO concentrations in N2, as well as in human breath samples with ultrahigh sensitivity and specificity. The CRDS system could also be generalized to measure simultaneously many other trace molecular species within the broad tuning range of cw EC-QCL, as well as for studying the rotationally resolved hyperfine structures.
Collapse
|
28
|
Cai T, Gao G, Wang M. Simultaneous detection of atmospheric CH(4) and CO using a single tunable multi-mode diode laser at 2.33 μm. OPTICS EXPRESS 2016; 24:859-873. [PMID: 26832469 DOI: 10.1364/oe.24.000859] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report on the first application (to our knowledge) of an extended-wavelength (2.33 μm) multi-mode diode laser for simultaneous measurement of the concentrations of CH(4) and CO in the ambient air. The signals identification and quantitative analysis are performed using correlation spectroscopy. A Herriott cell and the wavelength modulation spectroscopy technique with second harmonic detection are also utilized to improve the detection sensitivity of the system. The detection limits of the system are estimated to be about 81 ppbv and 31 ppbv for CH(4) and CO, respectively. The accuracy, sensitivity, precision, and stability are also analyzed to confirm the potential of the system.
Collapse
|
29
|
Mandon J, Mur LAJ, Harren FJM, Cristescu SM. Laser-Based Methods for Detection of Nitric Oxide in Plants. Methods Mol Biol 2016; 1424:113-126. [PMID: 27094415 DOI: 10.1007/978-1-4939-3600-7_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nitric oxide (NO) plays an important role in plant signaling and in response to various stress conditions. Therefore, real-time measurements of NO production provide better insights into understanding plant processes and can help developing strategies to improve food production and postharvest quality. Using laser-based spectroscopic methods, sensitive, online, in planta measurements of plant-pathogen interactions are possible. This chapter introduces the basic principle of the optical detectors using different laser sources for accurate monitoring of fast dynamic changes of NO production. Several applications are also presented to demonstrate the suitability of these detectors for detection of NO in plants.
Collapse
Affiliation(s)
- Julien Mandon
- Department of Molecular and Laser Physics, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Luis A J Mur
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Penglais Campus, Edward Llywd Building, Aberystwyth, Wales, SY23 3DA, UK
| | - Frans J M Harren
- Department of Molecular and Laser Physics, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Simona M Cristescu
- Department of Molecular and Laser Physics, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
| |
Collapse
|
30
|
Nitric oxide isotopic analyzer based on a compact dual-modulation Faraday rotation spectrometer. SENSORS 2015; 15:25992-6008. [PMID: 26473876 PMCID: PMC4634453 DOI: 10.3390/s151025992] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 09/28/2015] [Accepted: 10/08/2015] [Indexed: 11/29/2022]
Abstract
We have developed a transportable spectroscopic nitrogen isotopic analyzer. The spectrometer is based on dual-modulation Faraday rotation spectroscopy of nitric oxide isotopologues with near shot-noise limited performance and baseline-free operation. Noise analysis indicates minor isotope (15NO) detection sensitivity of 0.36 ppbv·Hz−1/2, corresponding to noise-equivalent Faraday rotation angle (NEA) of 1.31 × 10−8 rad·Hz−1/2 and noise-equivalent absorbance (αL)min of 6.27 × 10−8 Hz−1/2. White-noise limited performance at 2.8× the shot-noise limit is observed up to ~1000 s, allowing reliable calibration and sample measurement within the drift-free interval of the spectrometer. Integration with wet-chemistry based on acidic vanadium(III) enables conversion of aqueous nitrate/nitrite samples to gaseous NO for total nitrogen isotope analysis. Isotopic ratiometry is accomplished via time-multiplexed measurements of two NO isotope transitions. For 5 μmol potassium nitrate samples, the instrument consistently yields ratiometric precision below 0.3‰, thus demonstrating potential as an in situ diagnostic tool for environmental nitrogen cycle studies.
Collapse
|
31
|
Chesnokov E, Kubarev V, Koshlyakov P, Getmanov Y, Shevchenko O. Non-Faraday rotation of the free induction decay in gaseous NO. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.07.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
32
|
Kalchmair S, Blanchard R, Mansuripur TS, de Naurois GM, Pfluegl C, Witinski MF, Diehl L, Capasso F, Loncar M. High tuning stability of sampled grating quantum cascade lasers. OPTICS EXPRESS 2015; 23:15734-15747. [PMID: 26193552 DOI: 10.1364/oe.23.015734] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Predictable tuning behavior and stable laser operation are both crucial for laser spectroscopy measurements. We report a sampled grating quantum cascade laser (QCL) with high spectral tuning stability over the entire tuning range. We have determined the minimum loss margin required to suppress undesired lasing modes in order to ensure predictable tuning behavior. We have quantified power fluctuations and drift of our devices by measuring the Allan deviation. To demonstrate the feasibility of sampled grating QCLs for high-precision molecular spectroscopy, we have built a simple transmission spectroscopy setup. Our results prove that sampled grating QCLs are suitable light sources for highly sensitive spectroscopy measurements.
Collapse
|
33
|
Wang Y, Nikodem M, Zhang E, Cikach F, Barnes J, Comhair S, Dweik RA, Kao C, Wysocki G. Shot-noise limited Faraday rotation spectroscopy for detection of nitric oxide isotopes in breath, urine, and blood. Sci Rep 2015; 5:9096. [PMID: 25767064 PMCID: PMC4357895 DOI: 10.1038/srep09096] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 02/19/2015] [Indexed: 11/24/2022] Open
Abstract
Measurement of NO and/or its metabolites in the various body compartments has transformed our understanding of biology. The inability of the current NO measurement methods to account for naturally occurring and experimental NO isotopes, however, has prevented the scientific community from fully understating NO metabolism in vivo. Here we present a mid-IR Faraday rotation spectrometer (FRS) for detection of NO isotopes. The instrument utilizes a novel dual modulation/demodulation (DM) FRS method which exhibits noise performance at only 2 times the fundamental quantum shot-noise level and provides the record sensitivity in its class. This is achieved with a system that is fully autonomous, robust, transportable, and does not require cryogenic cooling. The DM-FRS enables continuous monitoring of nitric oxide isotopes with the detection limits of 3.72 ppbv/Hz1/2 to14NO and 0.53 ppbv/Hz1/2 to15NO using only 45 cm active optical path. This DM-FRS measurement method can be used to improve the performance of conventional FRS sensors targeting other radical species. The feasibility of the instrument to perform measurements relevant to studies of NO metabolism in humans is demonstrated.
Collapse
Affiliation(s)
- Yin Wang
- Electrical Engineering Department, Princeton University, Princeton, NJ 08540, USA
| | - Michal Nikodem
- Electrical Engineering Department, Princeton University, Princeton, NJ 08540, USA
| | - Eric Zhang
- Electrical Engineering Department, Princeton University, Princeton, NJ 08540, USA
| | - Frank Cikach
- Department of Pathobiology/Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Jarrod Barnes
- Department of Pathobiology/Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Suzy Comhair
- Department of Pathobiology/Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Raed A Dweik
- 1] Department of Pathobiology/Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA [2] Pulmonary and Critical Care Medicine/Respiratory Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Christina Kao
- Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
| | - Gerard Wysocki
- Electrical Engineering Department, Princeton University, Princeton, NJ 08540, USA
| |
Collapse
|
34
|
Zhang EJ, Brumfield B, Wysocki G. Hybrid Faraday rotation spectrometer for sub-ppm detection of atmospheric O2. OPTICS EXPRESS 2014; 22:15957-15968. [PMID: 24977851 DOI: 10.1364/oe.22.015957] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Faraday rotation spectroscopy (FRS) of O(2) is performed at atmospheric conditions using a DFB diode laser and permanent rare-earth magnets. Polarization rotation is detected with a hybrid-FRS detection method that combines the advantages of two conventional approaches: balanced optical-detection and conventional FRS with an optimized analyzer offset angle for maximum sensitivity enhancement. A measurement precision of 0.6 ppmv·Hz(-1/2) for atmospheric O(2) has been achieved. The theoretical model of hybrid detection is described, and the calculated detection limits are in excellent agreement with experimental values.
Collapse
|
35
|
Brumfield B, Sun W, Wang Y, Ju Y, Wysocki G. Dual modulation Faraday rotation spectroscopy of HO2 in a flow reactor. OPTICS LETTERS 2014; 39:1783-1786. [PMID: 24686604 DOI: 10.1364/ol.39.001783] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The technique of dual modulation Faraday rotation spectroscopy (DM-FRS) has been applied to achieve technical-noise-limited detection of HO2 at the exit of an atmospheric pressure flow reactor. This was implemented by combining direct current modulation at 51 kHz of an external cavity quantum cascade laser system with 610 Hz modulation of the magnetic field generated by a Helmholtz coil. The DM-FRS measurement had a 1.5 times better signal-to-noise ratio than a conventional FRS measurement acquired under identical flow reactor conditions. High harmonic detection of the FRS signal also eliminated the substantial offset associated with electromagnetic interference pickup from the Helmholtz coils that is observed in the conventional FRS spectrum. A noise equivalent angle of 8.9×10(-9) rad Hz(-1/2) was measured for the DM-FRS measurement, corresponding to a 3σ detection limit for HO2 of 0.35 ppmv Hz(-1/2).
Collapse
|
36
|
Phillips MC, Taubman MS, Bernacki BE, Cannon BD, Stahl RD, Schiffern JT, Myers TL. Real-time trace gas sensing of fluorocarbons using a swept-wavelength external cavity quantum cascade laser. Analyst 2014; 139:2047-56. [DOI: 10.1039/c3an01642k] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
37
|
Nikodem M, Plant G, Wang Z, Prucnal P, Wysocki G. Chirped lasers dispersion spectroscopy implemented with single- and dual-sideband electro-optical modulators. OPTICS EXPRESS 2013; 21:14649-14655. [PMID: 23787653 DOI: 10.1364/oe.21.014649] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report new approaches for signal generation in Chirped Laser Dispersion Spectroscopy (CLaDS). Two optical arrangements based on electro-optical modulators significantly reduce CLaDS system complexity and enable optimum performance when applied to detection of GHz-wide molecular transitions. Proof-of-principle experiments in the near-infrared spectral range are presented and potential strategies for application in the mid-infrared are discussed.
Collapse
Affiliation(s)
- Michal Nikodem
- Electrical Engineering Department, Princeton University, Princeton, NJ 08540, USA.
| | | | | | | | | |
Collapse
|
38
|
Cristescu SM, Mandon J, Harren FJM, Meriläinen P, Högman M. Methods of NO detection in exhaled breath. J Breath Res 2013; 7:017104. [PMID: 23445766 DOI: 10.1088/1752-7155/7/1/017104] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
There is still an unexplored potential for exhaled nitric oxide (NO) in many clinical applications. This study presents an overview of the currently available methods for monitoring NO in exhaled breath and the use of the modelling of NO production and transport in the lung in clinical practice. Three technologies are described, namely chemiluminescence, electrochemical sensing and laser-based detection with their advantages and limitations. Comparisons are made in terms of sensitivity, time response, size, costs and suitability for clinical purposes. The importance of the flow rate for NO sampling is discussed from the perspective of the recent recommendations for standardized procedures for online and offline NO measurement. The measurement of NO at one flow rate, such as 50 ml s(-1), can neither determine the alveolar site/peripheral contribution nor quantify the difference in NO diffusion from the airways walls. The use of NO modelling (linear or non-linear approach) can solve this problem and provide useful information about the source of NO. This is of great value in diagnostic procedures of respiratory diseases and in treatment with anti-inflammatory drugs.
Collapse
Affiliation(s)
- S M Cristescu
- Life Science Trace Gas Facility, Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands.
| | | | | | | | | |
Collapse
|
39
|
Wörle K, Seichter F, Wilk A, Armacost C, Day T, Godejohann M, Wachter U, Vogt J, Radermacher P, Mizaikoff B. Breath analysis with broadly tunable quantum cascade lasers. Anal Chem 2013; 85:2697-702. [PMID: 23320383 DOI: 10.1021/ac3030703] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
With the availability of broadly tunable external cavity quantum cascade lasers (EC-QCLs), particularly bright mid-infrared (MIR; 3-20 μm) light sources are available offering high spectral brightness along with an analytically relevant spectral tuning range of >2 μm. Accurate isotope ratio determination of (12)CO2 and (13)CO2 in exhaled breath is of critical importance in the field of breath analysis, which may be addressed via measurements in the MIR spectral regime. Here, we combine for the first time an EC-QCL tunable across the (12)CO2/(13)CO2 spectral band with a miniaturized hollow waveguide gas cell for quantitatively determining the (12)CO2/(13)CO2 ratio within the exhaled breath of mice. Due to partially overlapping spectral features, these studies are augmented by appropriate multivariate data evaluation and calibration techniques based on partial least-squares regression along with optimized data preprocessing. Highly accurate determinations of the isotope ratio within breath samples collected from a mouse intensive care unit validated via hyphenated gas chromatography-mass spectrometry confirm the viability of IR-HWG-EC-QCL sensing techniques for isotope-selective exhaled breath analysis.
Collapse
Affiliation(s)
- Katharina Wörle
- Institute of Analytical and Bioanalytical Chemistry, University of Ulm, 89081 Ulm, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Englich FV, Grabka M, Lancaster DG, Monro TM. Magnetic field interaction with guided light for detection of an active gaseous medium within an optical fiber. OPTICS EXPRESS 2013; 21:2491-2499. [PMID: 23389230 DOI: 10.1364/oe.21.002491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report a novel fiber-optic sensing architecture for the detection of paramagnetic gases. By interacting a modulated magnetic field with guided light within a microstructured optical fiber, it is possible to exploit Faraday Rotation Spectroscopy (FRS) within unprecedentedly small sample volumes. This approach, which utilizes magnetic circular birefringence and magnetic circular dichroism effects, is applied to a photonic bandgap fiber to detect molecular oxygen and operates at a wavelength of 762.309 nm. The optical fiber sensor has a 4.2 nL detection volume and 14.8 cm long sensing region. The observed FRS spectra are compared with a theoretical model that provides a first understanding of guided-mode FRS signals. This FRS guided-wave sensor offers the prospect of new compact sensing schemes.
Collapse
Affiliation(s)
- Florian V Englich
- Institute for Photonics and Advanced Sensing (IPAS) and School of Chemistry and Physics, The University of Adelaide, SA 5005, Australia.
| | | | | | | |
Collapse
|
41
|
Wang Y, Nikodem M, Wysocki G. Cryogen-free heterodyne-enhanced mid-infrared Faraday rotation spectrometer. OPTICS EXPRESS 2013; 21:740-55. [PMID: 23388967 PMCID: PMC3635467 DOI: 10.1364/oe.21.000740] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Revised: 11/20/2012] [Accepted: 12/21/2012] [Indexed: 05/13/2023]
Abstract
A new detection method for Faraday rotation spectra of paramagnetic molecular species is presented. Near shot-noise limited performance in the mid-infrared is demonstrated using a heterodyne enhanced Faraday rotation spectroscopy (H-FRS) system without any cryogenic cooling. Theoretical analysis is performed to estimate the ultimate sensitivity to polarization rotation for both heterodyne and conventional FRS. Sensing of nitric oxide (NO) has been performed with an H-FRS system based on thermoelectrically cooled 5.24 μm quantum cascade laser (QCL) and a mercury-cadmium-telluride photodetector. The QCL relative intensity noise that dominates at low frequencies is largely avoided by performing the heterodyne detection in radio frequency range. H-FRS exhibits a total noise level of only 3.7 times the fundamental shot noise. The achieved sensitivity to polarization rotation of 1.8 × 10(-8) rad/Hz(1/2) is only 5.6 times higher than the ultimate theoretical sensitivity limit estimated for this system. The path- and bandwidth-normalized NO detection limit of 3.1 ppbv-m/Hz(1/2) was achieved using the R(17/2) transition of NO at 1906.73 cm(-1).
Collapse
Affiliation(s)
- Yin Wang
- Electrical Engineering Department, Princeton University, Princeton, New Jersey, 08544, USA
| | - Michal Nikodem
- Electrical Engineering Department, Princeton University, Princeton, New Jersey, 08544, USA
| | - Gerard Wysocki
- Electrical Engineering Department, Princeton University, Princeton, New Jersey, 08544, USA
| |
Collapse
|
42
|
Brumfield B, Wysocki G. Faraday rotation spectroscopy based on permanent magnets for sensitive detection of oxygen at atmospheric conditions. OPTICS EXPRESS 2012; 20:29727-29742. [PMID: 23388800 DOI: 10.1364/oe.20.029727] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A low-power Faraday rotation spectroscopy system that uses permanent rare-earth magnets has been developed for detection of O₂ at 762 nm. The experimental signals are generated using laser wavelength modulation combined with a balanced detection scheme that permits quantum shot noise limited performance. A noise equivalent polarization rotation angle of 8 × 10⁻⁸ rad/Hz¹/² is estimated from the experimental noise, and this agrees well with a theoretical model based on Jones calculus. A bandwidth normalized minimum detection limit to oxygen of 6 ppmv/Hz¹/² with an ultimate minimum of 1.3 ppmv at integration times of ~1 minute has been demonstrated.
Collapse
Affiliation(s)
- Brian Brumfield
- Electrical Engineering Department, Princeton University, Princeton, New Jersey 08544, USA
| | | |
Collapse
|
43
|
Studies of low-frequency intermolecular hydrogen-bonded vibrations using a continuous supersonic slit jet mid-infrared quantum cascade laser spectrometer. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.09.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
44
|
Nikodem M, Wysocki G. Chirped laser dispersion spectroscopy for remote open-path trace-gas sensing. SENSORS 2012; 12:16466-81. [PMID: 23443389 PMCID: PMC3571793 DOI: 10.3390/s121216466] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Revised: 10/26/2012] [Accepted: 11/21/2012] [Indexed: 11/16/2022]
Abstract
In this paper we present a prototype instrument for remote open-path detection of nitrous oxide. The sensor is based on a 4.53 μm quantum cascade laser and uses the chirped laser dispersion spectroscopy (CLaDS) technique for molecular concentration measurements. To the best of our knowledge this is the first demonstration of open-path laser-based trace-gas detection using a molecular dispersion measurement. The prototype sensor achieves a detection limit down to the single-ppbv level and exhibits excellent stability and robustness. The instrument characterization, field deployment performance, and the advantages of applying dispersion sensing to sensitive trace-gas detection in a remote open-path configuration are presented.
Collapse
Affiliation(s)
| | - Gerard Wysocki
- Author to whom correspondence should be addressed; E-Mail:
| |
Collapse
|
45
|
Nowak KM, Ohta T, Suganuma T, Yokotsuka T, Fujimoto J, Mizoguchi H, Endo A. Spectral characteristics of quantum-cascade laser operating at 10.6 μm wavelength for a seed application in laser-produced-plasma extreme UV source. OPTICS LETTERS 2012; 37:4765-4767. [PMID: 23164906 DOI: 10.1364/ol.37.004765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this Letter, we investigate, for the first time to our knowledge, the spectral properties of a quantum-cascade laser (QCL) from a point of view of a new application as a laser seeder for a nanosecond-pulse high-repetition frequency CO(2) laser operating at 10.6 μm wavelength. The motivation for this work is a renewed interest in such a pulse format and wavelength driven by a development of extreme UV (EUV) laser-produced-plasma (LPP) sources. These sources use pulsed multikilowatt CO(2) lasers to drive the EUV-emitting plasmas. Basic spectral performance characteristics of a custom-made QCL chip are measured, such as tuning range and chirp rate. The QCL is shown to have all essential qualities of a robust seed source for a high-repetition nanosecond-pulsed CO(2) laser required by EUV LPP sources.
Collapse
|
46
|
Spagnolo V, Patimisco P, Borri S, Scamarcio G, Bernacki BE, Kriesel J. Part-per-trillion level SF6 detection using a quartz enhanced photoacoustic spectroscopy-based sensor with single-mode fiber-coupled quantum cascade laser excitation. OPTICS LETTERS 2012; 37:4461-3. [PMID: 23114329 DOI: 10.1364/ol.37.004461] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A sensitive spectroscopic sensor based on a hollow-core fiber-coupled quantum cascade laser (QCL) emitting at 10.54 μm and quartz enhanced photoacoustic spectroscopy (QEPAS) technique is reported. The design and realization of mid-IR fiber and coupler optics has ensured single-mode QCL beam delivery to the QEPAS sensor. The collimation optics was designed to produce a laser beam of significantly reduced beam size and waist so as to prevent illumination of the quartz tuning fork and microresonator tubes. SF(6) was selected as the target gas. A minimum detection sensitivity of 50 parts per trillion in 1 s was achieved with a QCL power of 18 mW, corresponding to a normalized noise-equivalent absorption of 2.7×10(-10) W·cm(-1)/Hz(1/2).
Collapse
Affiliation(s)
- Vincenzo Spagnolo
- Dipartimento Interateneo di Fisica, University and Politecnico of Bari, CNR-IFN UOS BARI, Bari, Italy.
| | | | | | | | | | | |
Collapse
|
47
|
Nikodem M, Wysocki G. Molecular dispersion spectroscopy--new capabilities in laser chemical sensing. Ann N Y Acad Sci 2012; 1260:101-11. [PMID: 22809459 DOI: 10.1111/j.1749-6632.2012.06660.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Laser spectroscopic techniques suitable for molecular dispersion sensing enable new applications and strategies in chemical detection. This paper discusses the current state of the art and provides an overview of recently developed chirped laser dispersion spectroscopy (CLaDS)-based techniques. CLaDS and its derivatives allow for quantitative spectroscopy of trace gases and enable new capabilities, such as extended dynamic range of concentration measurements, high immunity to photodetected intensity fluctuations, or capability of direct processing of spectroscopic signals in optical domain. Several experimental configurations based on quantum cascade lasers and examples of molecular spectroscopic data are presented to demonstrate capabilities of molecular dispersion spectroscopy in the mid-infrared spectral region.
Collapse
Affiliation(s)
- Michal Nikodem
- Electrical Engineering Department, Princeton University, Princeton, New Jersey, USA
| | | |
Collapse
|
48
|
Hangauer A, Chen J, Strzoda R, Amann MC. Feasibility study of Zeeman modulation spectrometry with a hollow capillary fiber based gas cell. OPTICS LETTERS 2012; 37:1265-1267. [PMID: 22466216 DOI: 10.1364/ol.37.001265] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
For paramagnetic gases (e.g., O2, NO, NO2, OH) Zeeman modulation spectrometry is a method for spectrometric gas sensing with extraordinary selectivity. In this Letter it is combined with a hollow capillary based gas cell, where the gas is filled in long light-guiding capillary that is placed inside a toroidal coil. Over conventional Zeeman spectrometry this has the advantage of lower power consumption at long optical path length, since several loops of the hollow capillary fiber can be placed in the coil. Compared to wavelength modulation spectrometry the advantage is insensitivity to interference by multimode propagation in the fiber and absorption by other nonparamagnetic gases, which should enhance both sensor stability and sensitivity. Experimental and theoretical results are presented, showing the feasibility of the approach.
Collapse
Affiliation(s)
- Andreas Hangauer
- Walter Schottky Institute, Technical University of Munich, 85748 Garching, Germany.
| | | | | | | |
Collapse
|
49
|
Arslanov DD, Swinkels K, Cristescu SM, Harren FJM. Real-time, subsecond, multicomponent breath analysis by Optical Parametric Oscillator based Off-Axis Integrated Cavity Output Spectroscopy. OPTICS EXPRESS 2011; 19:24078-24089. [PMID: 22109433 DOI: 10.1364/oe.19.024078] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Breath analysis is an attractive field of research, due to its high potential for non-invasive medical diagnostics. Among others, laser-based absorption spectroscopy is an excellent method for the detection of gases in exhaled breath, because it can combine a high sensitivity with a good selectivity, and a high temporal resolution. Here, we use a fast-scanning continuous wave, singly-resonant Optical Parametric Oscillator (wavelength range between 3 and 4 μm, linewidth 40 MHz, output power > 1 W, scanning speed 100 THz/s) with Off-Axis Integrated Cavity Output Spectroscopy for rapid and sensitive trace gas detection. Real-time, low- ppbv detection of ethane is demonstrated in exhaled human breath during free exhalations. Also, simultaneous, real-time multi-component gas detection of ethane, methane and water was performed in exhaled breath using a wide spectral coverage over 17 cm(-1) in 1 second. Furthermore, real-time detection of acetone, a molecule with a wide absorption spectrum, was shown in exhaled breath, with a sub-second time resolution (0.4 s).
Collapse
Affiliation(s)
- Denis D Arslanov
- Life Science Trace Gas Research Group, Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University, P.O. Box 9010, NL-6500 GL Nijmegen, The Netherlands.
| | | | | | | |
Collapse
|
50
|
Rao GN, Karpf A. External cavity tunable quantum cascade lasers and their applications to trace gas monitoring. APPLIED OPTICS 2011; 50:A100-A115. [PMID: 21283214 DOI: 10.1364/ao.50.00a100] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Since the first quantum cascade laser (QCL) was demonstrated approximately 16 years ago, we have witnessed an explosion of interesting developments in QCL technology and QCL-based trace gas sensors. QCLs operate in the mid-IR region (3-24 μm) and can directly access the rotational vibrational bands of most molecular species and, therefore, are ideally suited for trace gas detection with high specificity and sensitivity. These sensors have applications in a wide range of fields, including environmental monitoring, atmospheric chemistry, medical diagnostics, homeland security, detection of explosive compounds, and industrial process control, to name a few. Tunable external cavity (EC)-QCLs in particular offer narrow linewidths, wide ranges of tunability, and stable power outputs, which open up new possibilities for sensor development. These features allow for the simultaneous detection of multiple species and the study of large molecules, free radicals, ions, and reaction kinetics. In this article, we review the current status of EC-QCLs and sensor developments based on them and speculate on possible future developments.
Collapse
Affiliation(s)
- Gottipaty N Rao
- Department of Physics, Adelphi University, Garden City, New York 11530, USA.
| | | |
Collapse
|