1
|
Feye J, Matthias J, Fischer A, Rudolph D, Treptow J, Popescu R, Franke J, Exarhos AL, Boekelheide ZA, Gerthsen D, Feldmann C, Roesky PW, Rösch ES. SMART RHESINs-Superparamagnetic Magnetite Architecture Made of Phenolic Resin Hollow Spheres Coated with Eu(III) Containing Silica Nanoparticles for Future Quantitative Magnetic Particle Imaging Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2301997. [PMID: 37203272 DOI: 10.1002/smll.202301997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/15/2023] [Indexed: 05/20/2023]
Abstract
Magnetic particle imaging (MPI) is a powerful and rapidly growing tomographic imaging technique that allows for the non-invasive visualization of superparamagnetic nanoparticles (NPs) in living matter. Despite its potential for a wide range of applications, the intrinsic quantitative nature of MPI has not been fully exploited in biological environments. In this study, a novel NP architecture that overcomes this limitation by maintaining a virtually unchanged effective relaxation (Brownian plus Néel) even when immobilized is presented. This superparamagnetic magnetite architecture made of phenolic resin hollow spheres coated with Eu(III) containing silica nanoparticles (SMART RHESINs) was synthesized and studied. Magnetic particle spectroscopy (MPS) measurements confirm their suitability for potential MPI applications. Photobleaching studies show an unexpected photodynamic due to the fluorescence emission peak of the europium ion in combination with the phenol formaldehyde resin (PFR). Cell metabolic activity and proliferation behavior are not affected. Colocalization experiments reveal the distinct accumulation of SMART RHESINs near the Golgi apparatus. Overall, SMART RHESINs show superparamagnetic behavior and special luminescent properties without acute cytotoxicity, making them suitable for bimodal imaging probes for medical use like cancer diagnosis and treatment. SMART RHESINs have the potential to enable quantitative MPS and MPI measurements both in mobile and immobilized environments.
Collapse
Affiliation(s)
- Julia Feye
- Faculty of Engineering, Baden-Württemberg Cooperative State University Karlsruhe, 76133, Karlsruhe, Germany
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Jessica Matthias
- Department of Optical Nanoscopy, Max Planck Institute for Medical Research, 69120, Heidelberg, Germany
| | - Alena Fischer
- Department of Optical Nanoscopy, Max Planck Institute for Medical Research, 69120, Heidelberg, Germany
| | - David Rudolph
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Jens Treptow
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Radian Popescu
- Laboratory for Electron Microscopy, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Jochen Franke
- Bruker, BioSpin MRI GmbH, Preclinical Imaging Division, 76275, Ettlingen, Germany
| | | | | | - Dagmar Gerthsen
- Laboratory for Electron Microscopy, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Claus Feldmann
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Peter W Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Esther S Rösch
- Faculty of Engineering, Baden-Württemberg Cooperative State University Karlsruhe, 76133, Karlsruhe, Germany
| |
Collapse
|
2
|
Heuke S, Silva Martins C, André R, LeGoff L, Rigneault H. Frequency-encoded two-photon excited fluorescence microscopy. OPTICS LETTERS 2023; 48:4113-4116. [PMID: 37527131 DOI: 10.1364/ol.496071] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 07/06/2023] [Indexed: 08/03/2023]
Abstract
Two-photon excited fluorescence (2PEF) microscopy is the most popular non-linear imaging method of biomedical samples. State-of-the art 2PEF microscopes use multiple detectors and spectral filter sets to discriminate different fluorophores based on their distinct emission behavior (emission discrimination). One drawback of 2PEF is that fluorescence photons outside the filter transmission range are inherently lost, thereby reducing the imaging efficiency and speed. Furthermore, emission discrimination of different fluorophores may fail if their emission profiles are too similar. Here, we present an alternative 2PEF method that discriminates fluorophores based on their excitation spectra (excitation discrimination). For excitation we use two lasers of different wavelengths (ω1, ω2) resulting in excitation energies at 2ω1, 2ω2, and the mixing energy ω1+ω2. Both lasers are frequency encoded (FE) by an intensity modulation at distinct frequencies while all 2PEF emission is collected on a single detector. The signal is fed into a lock-in-amplifier and demodulated at various frequencies simultaneously. A customized nonnegative matrix factorization (NNMF) then generates fluorescence images that are free of cross talk. Combining FE-2PEF with multiple detectors has the potential to enable the simultaneous imaging of an unprecedented number of fluorophores.
Collapse
|
3
|
Design, photophysical properties, and applications of fluorene-based fluorophores in two-photon fluorescence bioimaging: A review. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C: PHOTOCHEMISTRY REVIEWS 2022. [DOI: 10.1016/j.jphotochemrev.2022.100529] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
4
|
Gao K, Liu Y, Qiao W, Song Y, Zhao X, Wang A, Li T. Wavelength-tunable 1104 nm nonlinear amplifier loop mirror laser based on a polarization-maintaining double-cladding fiber. OPTICS LETTERS 2022; 47:5-8. [PMID: 34951868 DOI: 10.1364/ol.445683] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 11/20/2021] [Indexed: 06/14/2023]
Abstract
An ytterbium-doped stretched-pulse mode-locked fiber oscillator was fabricated by applying a nonlinear amplifier loop mirror (NALM). The fiber cavity was built using a large-mode area (LMA) polarization-maintaining (PM) double-cladding (DC) fiber. The central wavelength of the generated 24.7 MHz laser can be modified from 1034 to 1104 nm by tuning the intra-cavity loss. The output power of this laser with a wavelength of 1104 nm at the transmission and reflection ports is 7.61 and 0.33 mW, respectively. The corresponding compressed pulse durations are 192 and 187 fs, which are 1.54 and 1.02 times the Fourier-transform-limited pulse duration, respectively.
Collapse
|
5
|
Digby EM, Ma T, Zipfel WR, Milstein JN, Beharry AA. Highly Potent Photoinactivation of Bacteria Using a Water-Soluble, Cell-Permeable, DNA-Binding Photosensitizer. ACS Infect Dis 2021; 7:3052-3061. [PMID: 34617443 DOI: 10.1021/acsinfecdis.1c00313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Antimicrobial photodynamic therapy (APDT) employs a photosensitizer, light, and molecular oxygen to treat infectious diseases via oxidative damage, with a low likelihood for the development of resistance. For optimal APDT efficacy, photosensitizers with cationic charges that can permeate bacteria cells and bind intracellular targets are desired to not limit oxidative damage to the outer bacterial structure. Here we report the application of brominated DAPI (Br-DAPI), a water-soluble, DNA-binding photosensitizer for the eradication of both Gram-negative and Gram-positive bacteria (as demonstrated on N99 Escherichia coli and Bacillus subtilis, respectively). We observe intracellular uptake of Br-DAPI, ROS-mediated bacterial cell death via one- and two-photon excitation, and selective photocytotoxicity of bacteria over mammalian cells. Photocytotoxicity of both N99 E. coli and B. subtilis occurred at submicromolar concentrations (IC50 = 0.2-0.4 μM) and low light doses (5 min irradiation times, 4.5 J cm-2 dose), making it superior to commonly employed APDT phenothiazinium photosensitizers such as methylene blue. Given its high potency and two-photon excitability, Br-DAPI is a promising novel photosensitizer for in vivo APDT applications.
Collapse
Affiliation(s)
- Elyse M. Digby
- Department of Chemical & Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road North, Mississauga, Ontario L5L 1C6, Canada
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Tianyi Ma
- Department of Chemical & Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road North, Mississauga, Ontario L5L 1C6, Canada
- Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada
| | - Warren R. Zipfel
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Joshua N. Milstein
- Department of Chemical & Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road North, Mississauga, Ontario L5L 1C6, Canada
- Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada
| | - Andrew A. Beharry
- Department of Chemical & Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road North, Mississauga, Ontario L5L 1C6, Canada
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| |
Collapse
|
6
|
Du Le VN, Saytashev I, Saha S, Lopez PF, Laughrey M, Ramella-Roman JC. Depth-resolved Mueller matrix polarimetry microscopy of the rat cornea. BIOMEDICAL OPTICS EXPRESS 2020; 11:5982-5994. [PMID: 33150000 PMCID: PMC7587284 DOI: 10.1364/boe.402201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 09/15/2020] [Accepted: 09/21/2020] [Indexed: 05/31/2023]
Abstract
Mueller matrix polarimetry (MMP) is a promising linear imaging modality that can enable visualization and measurement of the polarization properties of the cornea. Although the distribution of corneal birefringence has been reported, depth resolved MMP imaging of the cornea has not been archived and remains challenging. In this work, we perform depth-resolved imaging of the cornea using an improved system that combines Mueller matrix reflectance and transmission microscopy together with nonlinear microscopy utilizing second harmonic generation (SHG) and two photon excitation fluorescence (TPEF). We show that TPEF can reveal corneal epithelial cellular network while SHG can highlight the presence of corneal stromal lamellae. We then demonstrate that, in confocal reflectance measurement, as depth increases from 0 to 80 μm both corneal depolarization and retardation increase. Furthermore, it is shown that the spatial distribution of corneal depolarization and retardation displays similar complexity in both reflectance (confocal and non-confocal) and transmission measurement, likely due to the strong degree of heterogeneity in the stromal lamellae.
Collapse
Affiliation(s)
- V N Du Le
- Department of Biomedical Engineering, College of Engineering and Computing, Florida International University, 10555 West Flagler Street, Miami, FL 33174, USA
| | - Ilyas Saytashev
- Department of Ophthalmology, Herbert Wertheim College of Medicine, Florida International University, 11200 SW 8 Street, Miami, FL 33199, USA
| | - Sudipta Saha
- Department of Biomedical Engineering, College of Engineering and Computing, Florida International University, 10555 West Flagler Street, Miami, FL 33174, USA
| | - Pedro F Lopez
- Department of Ophthalmology, Herbert Wertheim College of Medicine, Florida International University, 11200 SW 8 Street, Miami, FL 33199, USA
| | - Megan Laughrey
- Department of Ophthalmology, Herbert Wertheim College of Medicine, Florida International University, 11200 SW 8 Street, Miami, FL 33199, USA
| | - Jessica C Ramella-Roman
- Department of Biomedical Engineering, College of Engineering and Computing, Florida International University, 10555 West Flagler Street, Miami, FL 33174, USA
- Department of Ophthalmology, Herbert Wertheim College of Medicine, Florida International University, 11200 SW 8 Street, Miami, FL 33199, USA
| |
Collapse
|
7
|
Abeywickrama CS, Wijesinghe KJ, Plescia CB, Fisher LS, Goodson T, Stahelin RV, Pang Y. A pyrene-based two-photon excitable fluorescent probe to visualize nuclei in live cells. Photochem Photobiol Sci 2020; 19:1152-1159. [PMID: 32639494 DOI: 10.1039/d0pp00107d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The two-photon absorption properties of a pyrene-pyridinium dye (1) were studied for potential application in two-photon spectroscopy. When probe 1 was used in cellular two-photon fluorescence microscopy imaging, it allowed the visualization of nuclei in live cells with a relatively low probe concentration (such as 1 μM). Spectroscopic evidence further revealed that probe 1 interacted with DNA as an intercalator. The proposed DNA intercalation properties of probe 1 were consistent with the experimental findings that suggested that the observed nucleus staining ability is dependent on the substituents on the pyridinium fragment of the probe.
Collapse
Affiliation(s)
| | - Kaveesha J Wijesinghe
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, USA
| | - Caroline B Plescia
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 47907, West Lafayette, Indiana, USA
| | - Lloyd S Fisher
- Department of Chemistry, University of Michigan, 48109, Ann Arbor, MI, USA
| | - Theodore Goodson
- Department of Chemistry, University of Michigan, 48109, Ann Arbor, MI, USA
| | - Robert V Stahelin
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 47907, West Lafayette, Indiana, USA
| | - Yi Pang
- Department of Chemistry, University of Akron, 44325, Akron, Ohio, USA. .,Maurice Morton Institute of Polymer Science, University of Akron, 44325, Akron, Ohio, USA.
| |
Collapse
|
8
|
Halip H, Yoshimura Y, Inami W, Kawata Y. Ultrashort laser based two-photon phase-resolved fluorescence lifetime measurement method. Methods Appl Fluoresc 2020; 8:025003. [PMID: 32000143 DOI: 10.1088/2050-6120/ab71c2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This paper presents a two-photon phase-resolved fluorescence-lifetime measurement method based on the use of an ultrashort pulse laser. The proposed method also involves the use of a lock-in amplifier to control the phase difference between the reference and fluorescence signals, thereby facilitating the use of an alternative method for determining fluorescence lifetimes. Verification of the fluorescence lifetimes as measured in this study was performed using rhodamine B and a cellular thermoprobe as samples. In this study, we assume that the fluorescence decay was monoexponential in all cases. Rhodamine B was observed to exhibit an average fluorescence lifetime of 2.15 ns, whereas a temperature sensitivity of 1.39 ns C-1 over a temperature range of 33.79-37.2 °C was demonstrated for the cellular thermoprobe. These results validate the feasibility of the proposed method for accurate measurement of fluorescence lifetimes using a simple laser configuration.
Collapse
Affiliation(s)
- Hafizah Halip
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka, Hamamatsu 432-8561, Japan
| | | | | | | |
Collapse
|
9
|
Guo J, Artur C, Womack T, Eriksen JL, Mayerich D. Multiplex protein-specific microscopy with ultraviolet surface excitation. BIOMEDICAL OPTICS EXPRESS 2020; 11:99-108. [PMID: 32010503 PMCID: PMC6968765 DOI: 10.1364/boe.11.000099] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 11/27/2019] [Accepted: 11/30/2019] [Indexed: 06/01/2023]
Abstract
Immunohistochemical techniques, such as immunofluorescence (IF) staining, enable microscopic imaging of local protein expression within tissue samples. Molecular profiling enabled by IF is critical to understanding pathogenesis and is often involved in complex diagnoses. A recent innovation, known as microscopy with ultraviolet surface excitation (MUSE), uses deep ultraviolet (≈280 nm) illumination to excite labels at the tissue surface, providing equivalent images without fixation, embedding, and sectioning. However, MUSE has not yet been integrated into traditional IF pipelines. This limits its application in more complex diagnoses that rely on protein-specific markers. This paper aims to broaden the applicability of MUSE to multiplex immunohistochemistry using quantum dot nanoparticles. We demonstrate the advantages of quantum dot labels for protein-specific MUSE imaging on both paraffin-embedded and intact tissue, significantly expanding MUSE applicability to protein-specific applications. Furthermore, with recent innovations in three-dimensional ultraviolet fluorescence microscopy, this opens the door to three-dimensional IF imaging with quantum dots using ultraviolet excitation.
Collapse
Affiliation(s)
- Jiaming Guo
- University of Houston, Department of Electrical and Computer Engineering, Houston, TX 77004, USA
- These authors contributed equally to this work
| | - Camille Artur
- University of Houston, Department of Electrical and Computer Engineering, Houston, TX 77004, USA
- These authors contributed equally to this work
| | - Tasha Womack
- University of Houston, Department of Pharmacology, Houston, TX 77004, USA
| | - Jason L. Eriksen
- University of Houston, Department of Pharmacology, Houston, TX 77004, USA
| | - David Mayerich
- University of Houston, Department of Electrical and Computer Engineering, Houston, TX 77004, USA
- University of Houston, NSF I/UCRC BRAIN Center, Houston, TX 77004, USA
| |
Collapse
|
10
|
Ricard C, Arroyo ED, He CX, Portera-Cailliau C, Lepousez G, Canepari M, Fiole D. Two-photon probes for in vivo multicolor microscopy of the structure and signals of brain cells. Brain Struct Funct 2018; 223:3011-3043. [PMID: 29748872 DOI: 10.1007/s00429-018-1678-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 05/03/2018] [Indexed: 02/07/2023]
Abstract
Imaging the brain of living laboratory animals at a microscopic scale can be achieved by two-photon microscopy thanks to the high penetrability and low phototoxicity of the excitation wavelengths used. However, knowledge of the two-photon spectral properties of the myriad fluorescent probes is generally scarce and, for many, non-existent. In addition, the use of different measurement units in published reports further hinders the design of a comprehensive imaging experiment. In this review, we compile and homogenize the two-photon spectral properties of 280 fluorescent probes. We provide practical data, including the wavelengths for optimal two-photon excitation, the peak values of two-photon action cross section or molecular brightness, and the emission ranges. Beyond the spectroscopic description of these fluorophores, we discuss their binding to biological targets. This specificity allows in vivo imaging of cells, their processes, and even organelles and other subcellular structures in the brain. In addition to probes that monitor endogenous cell metabolism, studies of healthy and diseased brain benefit from the specific binding of certain probes to pathology-specific features, ranging from amyloid-β plaques to the autofluorescence of certain antibiotics. A special focus is placed on functional in vivo imaging using two-photon probes that sense specific ions or membrane potential, and that may be combined with optogenetic actuators. Being closely linked to their use, we examine the different routes of intravital delivery of these fluorescent probes according to the target. Finally, we discuss different approaches, strategies, and prerequisites for two-photon multicolor experiments in the brains of living laboratory animals.
Collapse
Affiliation(s)
- Clément Ricard
- Brain Physiology Laboratory, CNRS UMR 8118, 75006, Paris, France.,Faculté de Sciences Fondamentales et Biomédicales, Université Paris Descartes, PRES Sorbonne Paris Cité, 75006, Paris, France.,Fédération de Recherche en Neurosciences FR 3636, Paris, 75006, France
| | - Erica D Arroyo
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Cynthia X He
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Carlos Portera-Cailliau
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, USA.,Department of Neurobiology, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Gabriel Lepousez
- Unité Perception et Mémoire, Département de Neuroscience, Institut Pasteur, 25 rue du Docteur Roux, 75724, Paris Cedex 15, France
| | - Marco Canepari
- Laboratory for Interdisciplinary Physics, UMR 5588 CNRS and Université Grenoble Alpes, 38402, Saint Martin d'Hères, France.,Laboratories of Excellence, Ion Channel Science and Therapeutics, Grenoble, France.,Institut National de la Santé et Recherche Médicale (INSERM), Grenoble, France
| | - Daniel Fiole
- Unité Biothérapies anti-Infectieuses et Immunité, Département des Maladies Infectieuses, Institut de Recherche Biomédicale des Armées, BP 73, 91223, Brétigny-sur-Orge cedex, France. .,Human Histopathology and Animal Models, Infection and Epidemiology Department, Institut Pasteur, 28 rue du docteur Roux, 75725, Paris Cedex 15, France. .,ESRF-The European Synchrotron, 38043, Grenoble cedex, France.
| |
Collapse
|
11
|
Cui Q, Chen Z, Liu Q, Zhang Z, Luo Q, Fu L. Visible continuum pulses based on enhanced dispersive wave generation for endogenous fluorescence imaging. BIOMEDICAL OPTICS EXPRESS 2017; 8:4026-4036. [PMID: 28966844 PMCID: PMC5611920 DOI: 10.1364/boe.8.004026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 07/31/2017] [Accepted: 07/31/2017] [Indexed: 06/07/2023]
Abstract
In this study, we demonstrate endogenous fluorescence imaging using visible continuum pulses based on 100-fs Ti:sapphire oscillator and a nonlinear photonic crystal fiber. Broadband (500-700 nm) and high-power (150 mW) continuum pulses are generated through enhanced dispersive wave generation by pumping femtosecond pulses at the anomalous dispersion region near zero-dispersion wavelength of high-nonlinear photonic crystal fibers. We also minimize the continuum pulse width by determining the proper fiber length. The visible-wavelength two-photon microscopy produces NADH and tryptophan images of mice tissues simultaneously. Our 500-700 nm continuum pulses support extending nonlinear microscopy to visible wavelength range that is inaccessible to 100-fs Ti:sapphire oscillators and other applications requiring visible laser pulses.
Collapse
Affiliation(s)
- Quan Cui
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Zhongyun Chen
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Qian Liu
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Zhihong Zhang
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Qingming Luo
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Ling Fu
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| |
Collapse
|
12
|
Trägårdh J, Murtagh M, Robb G, Parsons M, Lin J, Spence DJ, McConnell G. Two-Color, Two-Photon Imaging at Long Excitation Wavelengths Using a Diamond Raman Laser. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2016; 22:803-807. [PMID: 27492283 DOI: 10.1017/s143192761601151x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate that the second-Stokes output from a diamond Raman laser, pumped by a femtosecond Ti:Sapphire laser, can be used to efficiently excite red-emitting dyes by two-photon excitation at 1,080 nm and beyond. We image HeLa cells expressing red fluorescent protein, as well as dyes such as Texas Red and Mitotracker Red. We demonstrate the potential for simultaneous two-color, two-photon imaging with this laser by using the residual pump beam for excitation of a green-emitting dye. We demonstrate this for the combination of Alexa Fluor 488 and Alexa Fluor 568. Because the Raman laser extends the wavelength range of the Ti:Sapphire laser, resulting in a laser system tunable to 680-1,200 nm, it can be used for two-photon excitation of a large variety and combination of dyes.
Collapse
Affiliation(s)
- Johanna Trägårdh
- 1Centre for Biophotonics,Strathclyde Institute of Pharmacy and Biomedical Sciences,University of Strathclyde,161 Cathedral Street,Glasgow,G4 0RE,UK
| | - Michelle Murtagh
- 1Centre for Biophotonics,Strathclyde Institute of Pharmacy and Biomedical Sciences,University of Strathclyde,161 Cathedral Street,Glasgow,G4 0RE,UK
| | - Gillian Robb
- 1Centre for Biophotonics,Strathclyde Institute of Pharmacy and Biomedical Sciences,University of Strathclyde,161 Cathedral Street,Glasgow,G4 0RE,UK
| | - Maddy Parsons
- 3Randall Division of Cell and Molecular Biophysics,King's College London,Guy's Campus,London,SE11UL,UK
| | - Jipeng Lin
- 2MQ Photonics,Department of Physics and Astronomy,Macquarie University,NSW 2109,Australia
| | - David J Spence
- 2MQ Photonics,Department of Physics and Astronomy,Macquarie University,NSW 2109,Australia
| | - Gail McConnell
- 1Centre for Biophotonics,Strathclyde Institute of Pharmacy and Biomedical Sciences,University of Strathclyde,161 Cathedral Street,Glasgow,G4 0RE,UK
| |
Collapse
|
13
|
Murtagh M, Lin J, Trägårdh J, McConnell G, Spence DJ. Ultrafast second-Stokes diamond Raman laser. OPTICS EXPRESS 2016; 24:8149-8155. [PMID: 27137254 DOI: 10.1364/oe.24.008149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report a synchronously-pumped femtosecond diamond Raman laser operating with a tunable second-Stokes output. Pumped using a mode-locked Ti:sapphire laser at 840-910 nm with a duration of 165 fs, the second-Stokes wavelength was tuneable from 1082 - 1200 nm with sub-picosecond duration. Our results demonstrate potential for cascaded Raman conversion to extend the wavelength coverage of standard laser sources to new regions.
Collapse
|