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Hu Y, Picher M, Palluel M, Daro N, Freysz E, Stoleriu L, Enachescu C, Chastanet G, Banhart F. Laser-Driven Transient Phase Oscillations in Individual Spin Crossover Particles. Small 2023; 19:e2303701. [PMID: 37246252 DOI: 10.1002/smll.202303701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Indexed: 05/30/2023]
Abstract
An unusual expansion dynamics of individual spin crossover nanoparticles is studied by ultrafast transmission electron microscopy. After exposure to nanosecond laser pulses, the particles exhibit considerable length oscillations during and after their expansion. The vibration period of 50-100 ns is of the same order of magnitude as the time that the particles need for a transition from the low-spin to the high-spin state. The observations are explained in Monte Carlo calculations using a model where elastic and thermal coupling between the molecules within a crystalline spin crossover particle govern the phase transition between the two spin states. The experimentally observed length oscillations are in agreement with the calculations, and it is shown that the system undergoes repeated transitions between the two spin states until relaxation in the high-spin state occurs due to energy dissipation. Spin crossover particles are therefore a unique system where a resonant transition between two phases occurs in a phase transformation of first order.
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Affiliation(s)
- Yaowei Hu
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
| | - Matthieu Picher
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
| | - Marlène Palluel
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Nathalie Daro
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Eric Freysz
- Université de Bordeaux, CNRS UMR 5798, LOMA, Talence cedex, 33405, France
| | - Laurentiu Stoleriu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Cristian Enachescu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Guillaume Chastanet
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Florian Banhart
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
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2
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Maillard M, Amiard-Hudebine G, Tondusson M, Orain M, Freysz E. Kinetics and wavelength dependence of thermal and excited-state population on lens effect induced in a Nd:YAG rod amplifier. Opt Express 2023; 31:1799-1812. [PMID: 36785207 DOI: 10.1364/oe.478909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 12/04/2022] [Indexed: 06/18/2023]
Abstract
Using a wavefront sensor, we have measured the temporal evolution of the lens induced in a Nd:YAG rod amplifier under side pumping by laser diode bars centered around 808 nm in a quasi-continuous wave regime. The evolution of the induced lens is drastically different when measured with a probe pulse centered at 532 nm or 1064.5 nm. To explain this evolution, we developed a model that accounts for both the excited state population of the Nd3+ ions and the thermal contribution to the refractive index of the amplifier. This model, which takes into account amplification and wavelength shift of the probe pulse at 1064.5 nm, makes it possible to quantitatively describe the spectral and temporal evolution of the amplifier focal length. It also shows that the excited state population contribution is more important around 1064.5 nm and can partly compensate for the thermal lens induced in the amplifier.
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3
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Ghawas M, Freysz V, Müller L, Cassagnère S, Freysz E. High power ytterbium rod-type fiber laser delivering tunable picosecond pulses. Opt Express 2022; 30:44569-44579. [PMID: 36522879 DOI: 10.1364/oe.476353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 10/17/2022] [Indexed: 06/17/2023]
Abstract
We designed an all-normal dispersion ytterbium rod-type fiber laser oscillator delivering picosecond pulses which are continuously tunable both in central wavelength and pulse duration. This system delivers self-mode-locked pulses with an average power up to 25 W. At a repetition rate of 78 MHz, it yields picosecond laser pulses, of which the central wavelength and pulse duration can be tuned between 1010 nm - 1060 nm and 4.5 ps - 1.8 ps, respectively. The tunability is obtained by adjusting the position and the width of a slit which acts as a spectral bandwidth filter, placed close to the center of a 4f-folded zero dispersion line inserted in the laser cavity. This oscillator delivers nearly Fourier limited pulses with at most a 1.2 time-bandwidth product. A numerical model accounts well for the behavior of this all-normal dispersion fiber oscillator.
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4
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Degert J, Tondusson M, Freysz V, Abraham E, Kumar S, Freysz E. Ultrafast, broadband and tunable terahertz reflector and neutral density filter based on high resistivity silicon. Opt Express 2022; 30:18995-19004. [PMID: 36221687 DOI: 10.1364/oe.456012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 04/12/2022] [Indexed: 06/16/2023]
Abstract
We report THz transmission and reflection properties of an ultrafast optically excited highly resistive silicon wafer. Amplified Ti:Sapphire femtosecond laser pulses at 800 nm were used to create fluence-dependent carrier density on the front surface of the wafer which modifies the dielectric properties at the THz frequencies. Time-resolved experiments in the optical pump-THz probe configuration were conducted in which THz pulses reflected off from the surface at 0° and 45° angles of incidence make it possible to measure the pump-fluence dependent ultrafast evolution of the reflection and transmission coefficients in 0.5-6 THz range. An analytical model, where both the Drude contributions from the photo-excited electrons and holes account for the change of the dielectric constant of the photo-excited silicon, has been used to evaluate the THz reflection and transmission coefficients at steady state. Thus obtained results match well with the experimental results and demonstrate an all-optical means to convert a silicon wafer into an ultrafast, tunable and broadband neutral density filter or reflector in the THz frequency range.
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5
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Thiet Vu T, Daro N, Marchivie M, Mornet S, Freysz E, Chastanet G. Rational Direct Synthesis of RbMnFe Nanoparticles (RbMnFe = Rb xMn[Fe(CN) 6] (2+x)/3· nH 2O Prussian Blue Analogue). Inorg Chem 2022; 61:2945-2953. [PMID: 35119281 DOI: 10.1021/acs.inorgchem.1c03826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this paper, we report the chemical strategy followed to obtain, in a direct way, nanoparticles of the RbxMn[Fe(CN)6](x+2)/3·nH2O (RbMnFe) Prussian blue analogue with the aim of keeping the switching ability of this compound at the nanoscale. The switching properties come from a reversible electron transfer between the iron and manganese ions and depends on the rubidium content in the structure that has to be higher than 0.6. Despite the multifunctionality of this family of compounds and its interest in various applications, no systematic studies were performed to obtain well-defined nanoparticles. This paper relates to such an investigation. To draw relationship between size reduction, composition, and switching properties, a special attention was brought to the determination of the composition through elemental analysis and structure refinement of powder X-ray diffraction patterns together with infrared spectroscopy and elemental analysis. Several chemical parameters were explored to control both the size reduction and the composition following a direct synthetic approach. The results show that the smaller the particles, the lower the rubidium content. This observation might prevent the observation of switching properties on very small particles. Despite this antagonist effect, we achieved switchable particles of around 200 nm without any use of surfactant. Moreover, the size reduction is associated with the observation of the electron transfer down to 52% of rubidium in the nanoparticles against 64% in microparticles. This work is of particular interest in processing such nanoparticles into devices.
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Affiliation(s)
- Thi Thiet Vu
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, France
| | - Nathalie Daro
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, France
| | - Mathieu Marchivie
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, France
| | - Stéphane Mornet
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, France
| | - Eric Freysz
- University of Bordeaux, CNRS, UMR 5798, LOMA, F-33405 Talence Cedex, France
| | - Guillaume Chastanet
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, France
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6
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Freysz V, Freysz E. Femtosecond OPO pumped by a high power ytterbium rod-type fiber laser mode locked at harmonic repetition rates. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202226702040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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7
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Hu Y, Picher M, Tran NM, Palluel M, Stoleriu L, Daro N, Mornet S, Enachescu C, Freysz E, Banhart F, Chastanet G. Photo-Thermal Switching of Individual Plasmonically Activated Spin Crossover Nanoparticle Imaged by Ultrafast Transmission Electron Microscopy. Adv Mater 2021; 33:e2105586. [PMID: 34601766 DOI: 10.1002/adma.202105586] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/22/2021] [Indexed: 06/13/2023]
Abstract
Spin crossover (SCO) is a promising switching phenomenon when implemented in electronic devices as molecules, thin films or nanoparticles. Among the properties modulated along this phenomenon, optically induced mechanical changes are of tremendous importance as they can work as fast light-induced mechanical switches or allow to investigate and control microstructural strains and fatigability. The development of characterization techniques probing nanoscopic behavior with high spatio-temporal resolution allows to trigger and visualize such mechanical changes of individual nanoscopic objects. Here, ultrafast transmission electron microscopy (UTEM) is used to precisely probe the length changes of individual switchable nanoparticles induced thermally by nanosecond laser pulses. This allows revealing of the mechanisms of spin switching, leading to the macroscopic expansion of SCO materials. This study is conducted on individual pure SCO nanoparticles and SCO nanoparticles encapsulating gold nanorods that serve for plasmonic heating under laser pulses. Length changes are compared with time-resolved optical measurements performed on an assembly of these particles.
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Affiliation(s)
- Yaowei Hu
- Institut de Physique et Chimie des Matériaux, UMR 7504 CNRS, Université de Strasbourg, Strasbourg, F-67034, France
| | - Matthieu Picher
- Institut de Physique et Chimie des Matériaux, UMR 7504 CNRS, Université de Strasbourg, Strasbourg, F-67034, France
| | - Ngoc Minh Tran
- Universite de Bordeaux, CNRS, UMR 5798, LOMA, 358 Cours de la libération, Talence cedex, F-33405, France
| | - Marlène Palluel
- Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux, Bordeaux INP, UMR 5026, Pessac, F-33600, France
| | - Laurentiu Stoleriu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Nathalie Daro
- Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux, Bordeaux INP, UMR 5026, Pessac, F-33600, France
| | - Stephane Mornet
- Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux, Bordeaux INP, UMR 5026, Pessac, F-33600, France
| | - Cristian Enachescu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Eric Freysz
- Universite de Bordeaux, CNRS, UMR 5798, LOMA, 358 Cours de la libération, Talence cedex, F-33405, France
| | - Florian Banhart
- Institut de Physique et Chimie des Matériaux, UMR 7504 CNRS, Université de Strasbourg, Strasbourg, F-67034, France
| | - Guillaume Chastanet
- Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux, Bordeaux INP, UMR 5026, Pessac, F-33600, France
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8
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Kumar S, Nivedan A, Singh A, Kumar Y, Malhotra P, Tondusson M, Freysz E, Kumar S. Optical damage limit of efficient spintronic THz emitters. iScience 2021; 24:103152. [PMID: 34646990 PMCID: PMC8496183 DOI: 10.1016/j.isci.2021.103152] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 08/25/2021] [Accepted: 09/16/2021] [Indexed: 11/04/2022] Open
Abstract
THz pulses are generated from femtosecond pulse-excited ferromagnetic/nonmagnetic spintronic heterostructures via inverse spin Hall effect. The highest possible THz signal strength from spintronic THz emitters is limited by the optical damage threshold of the corresponding heterostructures at the excitation wavelength. For the thickness-optimized spintronic heterostructure, the THz generation efficiency does not saturate with the excitation fluence even up till the damage threshold. Bilayer (Fe, CoFeB)/(Pt, Ta)-based ferromagnetic/nonmagnetic (FM/NM) spintronic heterostructures have been studied for an optimized performance for THz generation when pumped by sub-50 fs amplified laser pulses at 800 nm. Among them, CoFeB/Pt is the best combination for an efficient THz source. The optimized FM/NM spintronic heterostructure having α-phase Ta as the nonmagnetic layer shows the highest damage threshold as compared to those with Pt, irrespective of their generation efficiency. The damage threshold of the Fe/Ta heterostructure on a quartz substrate is ∼85 GW/cm2. THz generation efficiency of (CoFeB,Fe)/(Pt,Ta) spintronic film heterostructures Determination of optical damage threshold at NIR excitation Mean value of the optical damage threshold is ∼60 GW/cm2
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Affiliation(s)
- Sandeep Kumar
- Femtosecond Spectroscopy and Nonlinear Photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Anand Nivedan
- Femtosecond Spectroscopy and Nonlinear Photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Arvind Singh
- Femtosecond Spectroscopy and Nonlinear Photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Yogesh Kumar
- Laser Science and Technology Center, Metcalfe House, Civil Lines, New Delhi 110054, India
| | - Purnima Malhotra
- Laser Science and Technology Center, Metcalfe House, Civil Lines, New Delhi 110054, India
| | - Marc Tondusson
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33405 Talence, France
| | - Eric Freysz
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33405 Talence, France
| | - Sunil Kumar
- Femtosecond Spectroscopy and Nonlinear Photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
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9
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Kumar S, Singh A, Nivedan A, Kumar S, Yun SJ, Lee YH, Tondusson M, Degert J, Oberle J, Freysz E. Sub‐bandgap activated charges transfer in a graphene‐MoS
2
‐graphene heterostructure. Nano Select 2021. [DOI: 10.1002/nano.202000159] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Sunil Kumar
- Femtosecond Spectroscopy and Nonlinear Photonics Laboratory Department of Physics Indian Institute of Technology Delhi New Delhi 110016 India
| | - Arvind Singh
- Femtosecond Spectroscopy and Nonlinear Photonics Laboratory Department of Physics Indian Institute of Technology Delhi New Delhi 110016 India
| | - Anand Nivedan
- Femtosecond Spectroscopy and Nonlinear Photonics Laboratory Department of Physics Indian Institute of Technology Delhi New Delhi 110016 India
| | - Sandeep Kumar
- Femtosecond Spectroscopy and Nonlinear Photonics Laboratory Department of Physics Indian Institute of Technology Delhi New Delhi 110016 India
| | - Seok Joon Yun
- Department of Energy Science Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea
| | - Young Hee Lee
- Department of Energy Science Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea
| | | | - Jérôme Degert
- CNRS, LOMA UMR 5798 Univ. Bordeaux Talence 33405 France
| | - Jean Oberle
- CNRS, LOMA UMR 5798 Univ. Bordeaux Talence 33405 France
| | - Eric Freysz
- CNRS, LOMA UMR 5798 Univ. Bordeaux Talence 33405 France
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10
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Ye H, Freysz V, Bello-Doua R, Pontagnier L, Santarelli G, Cormier E, Freysz E. Electro-optic comb pumped optical parametric oscillator with flexible repetition rate at GHz level. Opt Lett 2021; 46:1652-1655. [PMID: 33793509 DOI: 10.1364/ol.421621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 03/06/2021] [Indexed: 06/12/2023]
Abstract
We present a gigahertz (GHz)-repetition-rate optical parametric oscillator (OPO) pumped by an electro-optic comb at 1.03 µm, delivering sub-picosecond signal pulses across 1.5-1.7 µm from a MgO-doped periodically poled LiNbO3 crystal. Using a pump power of 5 W at 14.2 GHz repetition rate, 378 mW of signal power is obtained at 1.52 µm from a subharmonic cavity, corresponding to a signal extraction efficiency of 7.6%. By cascading a Mach-Zehnder modulator, the pump pulse repetition rate can be divided by any integer number from one to 14, allowing the OPO to operate with a flexible repetition rate from 1 to 14.2 GHz. A strategy leading to quasi-continuous repetition rate tunability of the OPO is also discussed.
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11
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Kumar S, Singh A, Kumar S, Nivedan A, Tondusson M, Degert J, Oberlé J, Yun SJ, Lee YH, Freysz E. Enhancement in optically induced ultrafast THz response of MoSe 2MoS 2 heterobilayer. Opt Express 2021; 29:4181-4190. [PMID: 33771003 DOI: 10.1364/oe.412548] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 12/27/2020] [Indexed: 06/12/2023]
Abstract
THz conductivity of large area MoS2 and MoSe2 monolayers as well as their vertical heterostructure, MoSe2MoS2 is measured in the 0.3-5 THz frequency range. Compared to the monolayers, the ultrafast THz reflectivity of the MoSe2MoS2 heterobilayer is enhanced many folds when optically excited above the direct band gap energies of the constituting monolayers. The free carriers generated in the heterobilayer evolve with the characteristic times found in each of the two monolayers. Surprisingly, the same enhancement is recorded in the ultrafst THz reflectivity of the heterobilayer when excited below the MoS2 bandgap energy. A mechanism accounting for these observations is proposed.
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12
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Sørensen CB, Guiramand L, Degert J, Tondusson M, Skovsen E, Freysz E, Abraham E. Conical versus Gaussian terahertz emission from two-color laser-induced air plasma filaments. Opt Lett 2020; 45:2132-2135. [PMID: 32236087 DOI: 10.1364/ol.390112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 03/12/2020] [Indexed: 06/11/2023]
Abstract
In this Letter, we demonstrate that the far-field terahertz (THz) beam generated from a Ti:Sapphire two-color laser-induced filament can exhibit a conical or Gaussian distribution, depending on the filtering experimental conditions. Using both an incoherent Golay cell detector and a two-dimensional coherent electro-optic detection covering the 0.2-2.6 THz spectral range, in our experimental conditions, we provide evidence that the conical emission is due to photo-induced carriers in the silicon filter, typically used to block the remaining pump laser light. Moreover, the low-frequency THz beam retrieves an almost $ {{\rm TEM}_{00}} $TEM00 Gaussian spatial distribution when the silicon filter is preceded by a large bandgap ceramic filter, which stops the pump beam, thus preventing the carrier generation in the silicon filter.
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13
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Ould Hamouda A, Dutin F, Degert J, Tondusson M, Naim A, Rosa P, Freysz E. Study of the Photoswitching of a Fe(II) Chiral Complex through Linear and Nonlinear Ultrafast Spectroscopy. J Phys Chem Lett 2019; 10:5975-5982. [PMID: 31536709 DOI: 10.1021/acs.jpclett.9b01946] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Photoswitching the physical properties of molecular systems opens large possibilities for driving materials far from equilibrium toward new states. Moreover, ultrashort pulses of light make it possible to induce and to record photoswitching on a very short time scale, opening the way to fascinating new functionalities. Among molecular materials, Fe(II) complexes exhibit an ultrafast spin-state transition during which the spin state of the complex switches from a low spin state (LS, S = 0) to a high spin state (HS, S = 2). The latter process is remarkable: It takes place within ∼100 fs with a quantum efficiency of ∼100%. Moreover, the spin-state switching induces an important shift of the broad metal-to-ligand absorption band of the complex, and it results in large modifications of the physical and chemical properties of the compounds. But because most of the Fe(II) complexes crystallize in centrosymmetric space groups, this prevents them from exhibiting piezoelectric, ferroelectric, as well as second-order nonlinear optical properties such as second-harmonic generation (SHG). This considerably limits their potential applications. We have recently synthesized [Fe(phen)3] [Δ-As2(tartrate)2] chiral complexes that crystallize in a noncentrosymmetric 32 space group. Hereafter, upon the excitation of a thin film of these complexes by a femtosecond laser pulse and performing simultaneously transient absorption (TRA) and time-resolved SHG (TRSH) measurements, we have recorded the ultrafast LS to HS switching. Whereas a single TRA measurement gives only partial information, we demonstrate that TRSH readily reveals the different mechanisms in play during the HS-to-LS state relaxation. Moreover, a simple model makes it possible to evaluate the relaxation times as well as the hyperpolarizabilities of the different excited states through which the system travels during the spin-state transition.
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Affiliation(s)
- Amine Ould Hamouda
- CNRS, Univ. Bordeaux, LOMA UMR 5798 , 351 Cours de la Libération , 33405 Talence , France
| | - Frédéric Dutin
- CNRS, Univ. Bordeaux, LOMA UMR 5798 , 351 Cours de la Libération , 33405 Talence , France
| | - Jérôme Degert
- CNRS, Univ. Bordeaux, LOMA UMR 5798 , 351 Cours de la Libération , 33405 Talence , France
| | - Marc Tondusson
- CNRS, Univ. Bordeaux, LOMA UMR 5798 , 351 Cours de la Libération , 33405 Talence , France
| | - Ahmad Naim
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026 , F-33600 Pessac , France
| | - Patrick Rosa
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026 , F-33600 Pessac , France
| | - Eric Freysz
- CNRS, Univ. Bordeaux, LOMA UMR 5798 , 351 Cours de la Libération , 33405 Talence , France
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14
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Naim A, Bouhadja Y, Cortijo M, Duverger-Nédellec E, Flack HD, Freysz E, Guionneau P, Iazzolino A, Ould Hamouda A, Rosa P, Stefańczyk O, Valentín-Pérez Á, Zeggar M. Design and Study of Structural Linear and Nonlinear Optical Properties of Chiral [Fe(phen)3]2+ Complexes. Inorg Chem 2018; 57:14501-14512. [DOI: 10.1021/acs.inorgchem.8b01089] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Ahmad Naim
- ICMCB, CNRS, Université de Bordeaux, UMR 5026, F-33600 Pessac, France
| | - Yacine Bouhadja
- Department of Chemistry, University of Annaba, BP 12-23200 Sidi-Ammar, Algérie
| | - Miguel Cortijo
- ICMCB, CNRS, Université de Bordeaux, UMR 5026, F-33600 Pessac, France
- CRPP, CNRS, Université de Bordeaux, UMR 5031, F-33600 Pessac, France
| | | | - Howard D. Flack
- Chimie Minérale, Analytique et Appliquée, Sciences II, Université de Genève, 30, Quai Ernest-Ansermet CH-1211 Geneva Switzerland
| | - Eric Freysz
- LOMA, UMR CNRS 5798, 351 Cours de la Libération, FR-33405 Talence Cedex, France
| | | | - Antonio Iazzolino
- LOMA, UMR CNRS 5798, 351 Cours de la Libération, FR-33405 Talence Cedex, France
| | - Amine Ould Hamouda
- LOMA, UMR CNRS 5798, 351 Cours de la Libération, FR-33405 Talence Cedex, France
| | - Patrick Rosa
- ICMCB, CNRS, Université de Bordeaux, UMR 5026, F-33600 Pessac, France
| | - Olaf Stefańczyk
- ICMCB, CNRS, Université de Bordeaux, UMR 5026, F-33600 Pessac, France
| | - Ángela Valentín-Pérez
- ICMCB, CNRS, Université de Bordeaux, UMR 5026, F-33600 Pessac, France
- CRPP, CNRS, Université de Bordeaux, UMR 5031, F-33600 Pessac, France
| | - Mehdi Zeggar
- ICMCB, CNRS, Université de Bordeaux, UMR 5026, F-33600 Pessac, France
- Department of Chemistry, University of Annaba, BP 12-23200 Sidi-Ammar, Algérie
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15
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Ould‐Hamouda A, Viquerat B, Degert J, Matar SF, Létard JF, Guillaume F, Freysz E. Impact of Spin State Transition on Vibrations of [Fe–(PM–BiA)
2
(NCS)
2
] and [Fe–(PM–PEA)
2
(NCS)
2
] Spin Crossover Compounds: Experimental and Theoretical Far IR and Raman Study. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201700979] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Amine Ould‐Hamouda
- Université Bordeaux CNRS, UMR 5798, LOMA 358 cours de la libération 33405 Talence Cedex France
| | - Benjamin Viquerat
- Université Bordeaux CNRS, UMR 5798, LOMA 358 cours de la libération 33405 Talence Cedex France
| | - Jérôme Degert
- Université Bordeaux CNRS, UMR 5798, LOMA 358 cours de la libération 33405 Talence Cedex France
| | - Samir F. Matar
- Université Bordeaux, CNRS, ICMCB 33400 Talence France
- Lebanese German University (LGU) Sahel‐Alma Campus, P.O. Box 206 Jounieh Lebanon
| | | | | | - Eric Freysz
- Université Bordeaux CNRS, UMR 5798, LOMA 358 cours de la libération 33405 Talence Cedex France
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16
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Affiliation(s)
- Amine Ould‐Hamouda
- CNRS UMR 5798, LOMA Universite Bordeaux 358 cours de la libération 33405 Talence Cedex France
| | - Antonio Iazzolino
- CNRS UMR 5798, LOMA Universite Bordeaux 358 cours de la libération 33405 Talence Cedex France
| | - Hiroko Tokoro
- Department of Chemistry School of Science The University of Tokyo 7‐3‐1 Hongo 113‐0033 Bunko‐ku, Tokyo Japan
- Division of Materials Science Faculty of Pure and Applied Sciences University of Tsukuba 1‐1‐1, Tennodai 305‐8573 Tsukuba, Ibaraki Japan
| | - Shin‐Ichi Ohkoshi
- Department of Chemistry School of Science The University of Tokyo 7‐3‐1 Hongo 113‐0033 Bunko‐ku, Tokyo Japan
| | - Eric Freysz
- CNRS UMR 5798, LOMA Universite Bordeaux 358 cours de la libération 33405 Talence Cedex France
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17
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Minasyan A, Trovato C, Degert J, Freysz E, Brasselet E, Abraham E. Geometric phase shaping of terahertz vortex beams. Opt Lett 2017; 42:41-44. [PMID: 28059173 DOI: 10.1364/ol.42.000041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We propose a topological beam-shaping strategy of terahertz (THz) beams using geometric phase elements made of space-variant birefringent slabs. Quasi-monochromatic THz vortex beams are produced and characterized both in amplitude and phase from the reconstructed real-time two-dimensional imaging of the electric field. Nonseparable superpositions of such vortex beams are also obtained and characterized by two-dimensional polarimetric analysis. These results emphasize the versatility of the spin-orbit electromagnetic toolbox to prepare on-demand structured light endowed with polarization-controlled orbital angular momentum content in the THz domain, which should find many uses in future THz technologies.
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18
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Abramczyk H, Brozek-Pluska B, Surmacki J, Tondusson M, Freysz E. Photostability of biological systems—Femtosecond dynamics of zinc tetrasulfonated phthalocyanine at cancerous and noncancerous human Breast tissues. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.08.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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19
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Abraham E, Cahyadi H, Brossard M, Degert J, Freysz E, Yasui T. Development of a wavefront sensor for terahertz pulses. Opt Express 2016; 24:5203-5211. [PMID: 29092346 DOI: 10.1364/oe.24.005203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Wavefront characterization of terahertz pulses is essential to optimize far-field intensity distribution of time-domain (imaging) spectrometers or increase the peak power of intense terahertz sources. In this paper, we report on the wavefront measurement of terahertz pulses using a Hartmann sensor associated with a 2D electro-optic imaging system composed of a ZnTe crystal and a CMOS camera. We quantitatively determined the deformations of planar and converging spherical wavefronts using the modal Zernike reconstruction least-squares method. Associated with deformable mirrors, the sensor will also open the route to terahertz adaptive optics.
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20
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Cornet M, Degert J, Abraham E, Freysz E. Frequency resolved cross-correlation between optical and terahertz pulses: application to ultrashort laser pulse characterization. Opt Express 2016; 24:3003-3010. [PMID: 26906866 DOI: 10.1364/oe.24.003003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We have analyzed both theoretically and experimentally the spectrum of the optical pulses produced by the interaction of optical and THz pulses in a ZnTe crystal. Recorded as a function of the delay between the two pulses, the resulting spectrogram can be viewed as a frequency resolved cross-correlation between the optical and THz pulses making it possible to characterize the optical pulse.
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21
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Cornet M, Degert J, Abraham E, Freysz E. Terahertz-field-induced second harmonic generation through Pockels effect in zinc telluride crystal. Opt Lett 2014; 39:5921-5924. [PMID: 25361120 DOI: 10.1364/ol.39.005921] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report on the second harmonic generation (SHG) of a near-infrared pulse in a zinc telluride crystal through the Pockels effect induced by an intense terahertz pulse. The temporal and angular behaviors of the SHG have been measured and agree well with theoretical predictions. This phenomenon, so far overlooked, makes it possible to generate second harmonic through cascading of two second-order nonlinear phenomena in the near-infrared and terahertz ranges. We also show how this cascading process can be used to sample terahertz pulses.
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22
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Ould-Hamouda A, Tokoro H, Ohkoshi SI, Freysz E. Single-shot time resolved study of the photo-reversible phase transition induced in flakes of Ti3O5 nanoparticles at room temperature. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.05.073] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Guillaume F, Tobon YA, Bonhommeau S, Létard JF, Moulet L, Freysz E. Photoswitching of the spin crossover polymeric material [Fe(Htrz)2(trz)](BF4) under continuous laser irradiation in a Raman scattering experiment. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.04.024] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Deslandes P, Perrin M, Saby J, Sangla D, Salin F, Freysz E. Picosecond to femtosecond pulses from high power self mode-locked ytterbium rod-type fiber laser. Opt Express 2013; 21:10731-10738. [PMID: 23669929 DOI: 10.1364/oe.21.010731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We have designed an ytterbium rod-type fiber laser oscillator with tunable pulse duration. This system that delivers more than 10 W of average power is self mode-locked. It yields femtosecond to picosecond laser pulses at a repetition rate of 74 MHz. The pulse duration is adjusted by changing the spectral width of a band pass filter that is inserted in the laser cavity. Using volume Bragg gratings of 0.9 nm and 0.07 nm spectrum bandwidth, this oscillator delivers nearly Fourier limited 2.8 ps and 18.5 ps pulses, respectively. With a 4 nm interference filter, one obtains picosecond pulses that have been externally dechirped down to 130 fs.
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25
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Galle G, Nicoul M, Woike T, Schaniel D, Freysz E. Monitoring of the ultrafast vibrational kinetic during formation of photo-induced linkage isomers in Na 2[Fe(CN) 5NO]·2H 2O single crystal. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134105005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Galle G, Tribollet J, Jonusauskas G, Tondusson M, Mauriac C, Létard J, Freysz E. High spin ↔ low spin ultrafast excitation and relaxation of an isolated iron(II) complex. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134105010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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27
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Abramczyk H, Jarota A, Brozek-Pluska B, Tondusson M, Freysz E, Musial J, Kordek R. Ultrafast dynamics and Raman imaging of metal complexes of tetrasulphonated phthalocyanines in human cancerous and noncancerous breast tissues. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134107006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Gallé G, Nicoul M, Woike T, Schaniel D, Freysz E. Unraveling the mechanism of NO ligand photoisomerism by time-resolved infrared spectroscopy. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.09.071] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Jarota A, Tondusson M, Galle G, Freysz E, Abramczyk H. Ultrafast dynamics of metal complexes of tetrasulphonated phthalocyanines. J Phys Chem A 2012; 116:4000-9. [PMID: 22471342 DOI: 10.1021/jp3017979] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A promising material in medicine, electronics, optoelectronics, electrochemistry, catalysis, and photophysics, tetrasulphonated aluminum phthalocyanine (AlPcS(4)), is investigated by means of steady-state and time-resolved pump-probe spectroscopies. Absorption and steady-state fluorescence spectroscopy indicate that AlPcS(4) is essentially monomeric. Spectrally resolved pump-probe data are recorded on time scales ranging from femtoseconds to nanoseconds. The nature of these fast processes and pathways of the competing relaxation processes from the initially excited electronic states in aqueous and organic (dimethyl sulfoxide) solutions are discussed. The decays and bleaching recovery have been fitted in the ultrafast window (0-10 ps) and later time window extending to nanoseconds (0-1 ns). While the excited-state dynamics have been found to be sensitive to the solvent environment, we were able to show that the fast dynamics is described by three time constants in the ranges of 115-500 fs, 2-25 ps, and 150-500 ps. We were able to ascribe these three time constants to different processes. The shortest time constants have been assigned to vibrational wavepacket dynamics. The few picosecond components have been assigned to vibrational relaxation in the excited electronic states. Finally, the 150-500 ps components represent the decay from S(1) to the ground state. The experimental and theoretical treatment proposed in this paper provides a basis for a substantial revision of the commonly accepted interpretation of the Soret transition (B transition) that exists in the literature.
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Affiliation(s)
- Arkadiusz Jarota
- Institute of Applied Radiation Chemistry, Laboratory of Laser Molecular Spectroscopy, Technical University of Lodz, Wroblewskiego 15, 93-590 Lodz, Poland
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Tribollet J, Galle G, Jonusauskas G, Deldicque D, Tondusson M, Letard J, Freysz E. Transient absorption spectroscopy of the iron(II) [Fe(phen)3]2+ complex: Study of the non-radiative relaxation of an isolated iron(II) complex. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.07.048] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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31
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Galle G, Degert J, Mauriac C, Etrillard C, Letard J, Freysz E. Nanosecond study of spin state transition induced by a single nanosecond laser shot on [Fe(NH2trz)3] compounds inside and outside their thermal hysteresis loops. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.09.059] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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32
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Kumar S, Kamaraju N, Moravsky A, Loutfy RO, Tondusson M, Freysz E, Sood AK. Terahertz Time Domain Spectroscopy to Detect Low‐Frequency Vibrations of Double‐Walled Carbon Nanotubes. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000524] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sunil Kumar
- Department of Physics and Centre for Ultrafast Laser Applications, Indian Institute of Science, Bangalore 560012, India
| | - Natrajan Kamaraju
- Department of Physics and Centre for Ultrafast Laser Applications, Indian Institute of Science, Bangalore 560012, India
| | | | - R. O. Loutfy
- Materials and Electrochemical Research Corporation, Tucson, AZ, USA
| | - Marc Tondusson
- Université de Bordeaux I, CPMOH, UMR CNRS 5798, 351, Cours de la liberation, 33405 Talence cedex, France
| | - Eric Freysz
- Université de Bordeaux I, CPMOH, UMR CNRS 5798, 351, Cours de la liberation, 33405 Talence cedex, France
| | - Ajay Kumar Sood
- Department of Physics and Centre for Ultrafast Laser Applications, Indian Institute of Science, Bangalore 560012, India
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Kumar S, Kamaraju N, Karthikeyan B, Tondusson M, Freysz E, Sood AK. Direct observation of low frequency confined acoustic phonons in silver nanoparticles: Terahertz time domain spectroscopy. J Chem Phys 2010; 133:014502. [DOI: 10.1063/1.3456372] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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34
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Fouché O, Degert J, Jonusauskas G, Daro N, Létard JF, Freysz E. Mechanism for optical switching of the spin crossover [Fe(NH2-trz)3](Br)2·3H2O compound at room temperature. Phys Chem Chem Phys 2010; 12:3044-52. [DOI: 10.1039/b921984f] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Forestier T, Kaiba A, Pechev S, Denux D, Guionneau P, Etrillard C, Daro N, Freysz E, Létard JF. Nanoparticles of [Fe(NH2-trz)3]Br2.3H2O (NH2-trz=2-amino-1,2,4-triazole) prepared by the reverse micelle technique: influence of particle and coherent domain sizes on spin-crossover properties. Chemistry 2009; 15:6122-30. [PMID: 19504472 DOI: 10.1002/chem.200900297] [Citation(s) in RCA: 150] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
This paper describes the synthesis of iron(II) spin-crossover nanoparticles prepared by the reverse micelle technique by using the non-ionic surfactant Lauropal (Ifralan D0205) from the polyoxyethylenic family. By changing the surfactant/water ratio, the size of the particles of [Fe(NH2-trz)3]Br2.3H2O (with NH2trz=4-amino-1,2,4-triazole) can be controlled. On the macroscopic scale this complex exhibits cooperative thermal spin crossovers at 305 and 320 K. We find that when the size is reduced down to 50 nm, the spin transition becomes gradual and no hysteresis can be detected. For our data it seems that the critical size, for which the existence of a thermal hysteresis can be detected, is around 50 nm. Interestingly, the change of the particle size induces almost no change in the temperature of the thermal spin transition. A systematic determination of coherent domain size carried out on the nanoparticles by powder X-ray diffraction indicates that at approximately 30 nm individual particles consist of one coherent domain.
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Affiliation(s)
- Thibaut Forestier
- CNRS, Université de Bordeaux, ICMCB, 87 Av. Doc. A. Schweitzer, 33608 Pessac, France
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36
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Fouché O, Degert J, Jonusauskas G, Baldé C, Desplanche C, Létard J, Freysz E. Laser induced spin state transition: Spectral and temporal evolution. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2008.12.070] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Arnaud C, Forestier T, Daro N, Freysz E, Létard JF, Pauliat G, Roosen G. Observation of an asymmetry in the thermal hysteresis loop at the scale of a single spin-crossover particle. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.01.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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D'Amico C, Tondusson M, Degert J, Freysz E. Tuning and focusing THz pulses by shaping the pump laser beam profile in a nonlinear crystal. Opt Express 2009; 17:592-597. [PMID: 19158872 DOI: 10.1364/oe.17.000592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Spatially shaped femtosecond laser pulses are used to generate and to focus tunable terahertz (THz) pulses by Optical Rectification in a Zinc Telluride (ZnTe) crystal. It is shown analytically and experimentally that the focusing position and spectrum of the emitted THz pulse can be changed, in the intermediate field zone, by controlling the spatial shape of the near-infrared (NIR) femtosecond (fs) laser pump. In particular, if the pump consists of concentric circles, the emitted THz radiation is confined around the propagation axis, producing a THz pulse train, and focusing position and spectrum can be controlled by changing the number of circles and their diameter.
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Affiliation(s)
- Ciro D'Amico
- Centre de Physique Moléculaire Optique et Hertzienne (C. P. M. O. H), CNRS UMR 5798, Université de Bordeaux 1, 351 cours de la libération, 33405, Talence, France.
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Baldé C, Desplanches C, Gütlich P, Freysz E, Létard J. Effect of the metal dilution on the thermal and light-induced spin transition in [FexMn1−x(bpp)2](NCSe)2: When T(LIESST) reaches T1/2. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.03.124] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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40
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Forestier T, Mornet S, Daro N, Nishihara T, Mouri SI, Tanaka K, Fouché O, Freysz E, Létard JF. Nanoparticles of iron(ii) spin-crossover. Chem Commun (Camb) 2008:4327-9. [DOI: 10.1039/b806347h] [Citation(s) in RCA: 166] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Freysz E, Montant S, Létard S, Létard JF. Single laser pulse induces spin state transition within the hysteresis loop of an Iron compound. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.07.017] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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42
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Hugonnot E, Somekh M, Villate D, Salin F, Freysz E. Optical parametric chirped pulse amplification and spectral shaping of a continuum generated in a photonic band gap fiber. Opt Express 2004; 12:2397-2403. [PMID: 19475076 DOI: 10.1364/opex.12.002397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A chirped pulse, spectrally broadened in a photonic bandgap optical fiber by 120 fs Ti:Sapphire laser pulses, is parametrically amplified in a BBO crystal pumped by a frequency doubled nanosecond Nd:YAG laser pulse. Without changing the frequency of the Ti:Sapphire, a spectral tunability of the amplified pulses is demonstrated. The possibility to achieve broader spectral range amplification is confirmed for a non-collinear pump-signal interaction geometry. For optimal non-collinear interaction geometry, the pulse duration of the original and amplified pulse are similar. Finally, we demonstrate that the combination of two BBO crystals makes it possible to spectrally shape the amplified pulses.
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Caumes JP, Videau L, Rouyer C, Freysz E. Direct measurement of wave-front distortion induced during second-harmonic generation: application to breakup-integral compensation. Opt Lett 2004; 29:899-901. [PMID: 15119415 DOI: 10.1364/ol.29.000899] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The wave-front distortion of femtosecond laser pulses recorded with a Shack-Hartmann analyzer makes it possible to retrieve the nonlinear index of refraction of different glasses and the nonlinear phase shift induced during second-harmonic generation in beta-barium borate (BBO) crystal versus the phase mismatch. It is shown that the nonlinear phase shift induced in a 2-mm-thick BBO crystal allows compensation for up to a 2pi breakup-integral induced in a 4-cm fused-silica glass. The stability of the compensation is reported to be from 10 to 100 GW cm(-2).
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Affiliation(s)
- Jean Pascal Caumes
- Commissariat à l'Energie Atomique, Centre d'Etudes Scientifiques et Techniques d'Aquitaine, B.P. 2, 33114 Le Barp, France
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Guillet de Chatellus H, Freysz E. Static and dynamic profile of the electric field within the bulk of fused silica glass during and after thermal poling. Opt Lett 2003; 28:1624-1626. [PMID: 13677516 DOI: 10.1364/ol.28.001624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We use the electric-field-induced second-harmonic (EFISH) technique to characterize, for the first time to our knowledge, the profile of the electric field induced within the bulk of fused silica glass samples both during and after thermal-poling treatment. During thermal poling, the initially homogeneous electric field decays exponentially from the anodic to the cathodic surface. After the poling treatment, a permanent electric field is induced within the bulk of the sample. It also decays exponentially from a positive value on the anodic surface to a negative value on the cathodic surface. The exponential decay constant depends on the thickness of the sample, the poling time, and the temperature. The temperature evolution of this constant makes it possible to retrieve the activation energy of the rapidly moving ionic species. This ensemble of observations indicates that modifications to models previously proposed are necessary.
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Affiliation(s)
- H Guillet de Chatellus
- Centre de Physique Moléculaire Optique et Hertzienne, Unité Mixte de Recherche 5798, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence Cedex, France
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Olivié G, Villate D, Videau L, Freysz E, Salin F. Temporal characterization of short pulses stretched by fiber Bragg gratings. Opt Lett 2003; 28:1585-1587. [PMID: 12956387 DOI: 10.1364/ol.28.001585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Short femtosecond pulses at 1054 nm are stretched up to 400 ps by long broadband chirped-fiber Bragg gratings. The temporal profile of the reflected pulses is measured with a cross-correlation scheme. The advantage of this technique over the usual spectral measurements is its high sensitivity, since the temporal profile of reflected pulses is revealed to be strongly affected by the presence of defects in the grating. We show that this method is a good test of the quality of fiber Bragg gratings.
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Affiliation(s)
- G Olivié
- Commissariat à l'Energie Atomique, Centre d'Etudes Scientifiques et Techniques d'Aquitaine, B.P. 2, 33114 Le Barp, France.
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Ratera I, Ruiz-Molina D, Sporer C, Marcen S, Montant S, Létard JF, Freysz E, Rovira C, Veciana J. Nonlinear optical properties of open-shell polychlorotriphenylmethyl radicals. Polyhedron 2003. [DOI: 10.1016/s0277-5387(03)00138-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ratera I, Marcen S, Montant S, Ruiz–Molina D, Rovira C, Veciana J, Létard JF, Freysz E. Nonlinear optical properties of polychlorotriphenylmethyl radicals: towards the design of `super-octupolar' molecules. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01059-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Caumes JP, Videau L, Rouyer C, Freysz E. Kerr-like nonlinearity induced via terahertz generation and the electro-optical effect in zinc blende crystals. Phys Rev Lett 2002; 89:047401. [PMID: 12144498 DOI: 10.1103/physrevlett.89.047401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2002] [Indexed: 05/23/2023]
Abstract
A model is proposed to account for Kerr-like nonlinearity induced by femtosecond pulses via terahertz generation and electro-optical effect. This phenomenon, so far overlooked, is evidenced in a zinc blende single crystal with a heterodyne optical Kerr effect setup. The spectral evolution of this phenomenon as well as its noninstantaneous response character are reported. Its competition with a third-order optical Kerr effect is demonstrated.
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Affiliation(s)
- J-P Caumes
- Centre de Physique Moléculaire Optique et Hertzienne, Université Bordeaux I, 351, cours de la libération, 33405 Talence cedex, France
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