Nonlinear Optical Phenomenon

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Hai-lung Dai - One of the best experts on this subject based on the ideXlab platform.

  • Molecule‐Membrane Interactions in Biological Cells Studied with Second Harmonic Light Scattering
    Chemistry an Asian journal, 2019
    Co-Authors: Michael J. Wilhelm, Hai-lung Dai
    Abstract:

    The Nonlinear Optical Phenomenon second harmonic light scattering (SHS) can be used for detecting molecules at the membrane surfaces of living biological cells. Over the last decade, SHS has been developed for quantitatively monitoring the adsorption and transport of small and medium size molecules (both neutral and ionic) across membranes in living cells. SHS can be operated with both time and spatial resolution and is even capable of isolating molecule-membrane interactions at specific membrane surfaces in multi-membrane cells, such as bacteria. In this review, we discuss select examples from our lab employing time-resolved SHS to study real-time molecular interactions at the plasma membranes of biological cells. We first demonstrate the utility of this method for determining the transport rates at each membrane/interface in a Gram-negative bacterial cell. Next, we show how SHS can be used to characterize the molecular mechanism of the century old Gram stain protocol for classifying bacteria. Additionally, we examine how membrane structures and molecular charge and polarity affect adsorption and transport, as well as how antimicrobial compounds alter bacteria membrane permeability. Finally, we discuss adaptation of SHS as an imaging modality to quantify molecular adsorption and transport in sub-cellular regions of individual living cells.

  • Time-resolved molecular transport across living cell membranes.
    Biophysical journal, 2013
    Co-Authors: Jia Zeng, Heather M. Eckenrode, Susan M. Dounce, Hai-lung Dai
    Abstract:

    It is shown that the Nonlinear Optical Phenomenon known as second-harmonic generation can be used for label-free, time-resolved study of the transport of molecules through living cell membranes. The adsorption and transport of a 300-Da molecular-mass hydrophobic ion at the Escherichia coli membrane is observed. Remarkably, at low ion concentrations, the second-harmonic generation technique clearly exposes a multistep molecular transport process: Transport of the molecular ion across the outer and cytoplasmic membranes of the Gram-negative bacteria is recorded, in sequence, in time. Fitting of the data to a multiprocess kinematic model reveals that the transport of this hydrophobic ion through the outer membrane is much faster than through the cytoplasmic membrane, likely reflecting the effectiveness of ion transport porins. The observations illustrate an experimental means for studying the interactions of small molecules with cell membranes.

  • Structure and Reactivity within Ultrathin Molecular Films
    2004
    Co-Authors: Hai-lung Dai
    Abstract:

    Abstract : A new technique based on the Nonlinear Optical Phenomenon - second harmonic generation - has been developed for probing the structure of nano- to micrometer thickness thin films made of small and medium size organic molecules. It was found that the magnitude of the inter-molecular interaction plays a critical role in determining the growth mechanism, structure, crystallization kinetics, and phase transitions of the thin molecular films. The Nonlinear Optical technique can even allow the determination of the orientation and alignment of the molecules at the interface between the thin film and the substrate. Order of the molecules in the interfacial layer affects the crystallization mechanism in the thin film.

  • Nonlinear Optical probe of structures and phase transitions in ultrathin molecular films
    Physical Chemistry of Interfaces and Nanomaterials II, 2003
    Co-Authors: Minchul Yang, Susan M. Dounce, Shih-hui Jen, Hai-lung Dai
    Abstract:

    The study of nanometer-thick molecular thin films deposited on a solid surface, due to recent technology applications, has become an important subject. Effective tools for unraveling the intrinsic structure within the molecular films and their growth mechanism, however, are still in the searching. Consequently, little is known about the structure and the most important factors controlling deposition of thin molecular films. This paper summarizes the demonstration showing that the Nonlinear Optical Phenomenon- second harmonic generation- because of its symmetry properties can be used effectively to characterize the structure within the molecular films. Experiments show that disorder-order phase transitions, glass transitions, crystallization kinetics and nucleation processes, and interfacial molecular structure within the thin molecular films can be characterized. The Nonlinear Optical studies have revealed the mechanisms and established the most important criteria for the deposition and growth of ultrathin molecular films.

André Mysyrowicz - One of the best experts on this subject based on the ideXlab platform.

Yu. P. Yakovlev - One of the best experts on this subject based on the ideXlab platform.

  • InAsSb/InAsSbP double heterostructure lasers for 3-4 micrometer spectral range.
    Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2006
    Co-Authors: A P Astakhova, A. N. Imenkov, T. N. Danilova, Victor V. Sherstnev, Yu. P. Yakovlev
    Abstract:

    InAsSb/InAsSbP double heterostructure diode lasers for the spectral range of 3-4 microm grown by liquid phase epitaxy have been investigated. The laser tuning was studied as a function of the stripe width. The temperature and current tuning of such lasers was measured. Emission spectra, far-field patterns and wavelength tuning versus current have been studied in the wide current range from threshold, Ith, up to 6Ith at liquid nitrogen temperature. Current wavelength tuning in single-mode lasing has been obtained both towards the shorter wavelengths (up to 4.56 cm-1) and towards the longer wavelengths (up to 0.9 cm-1) at the temperature T=77K. Comparison of the emission properties of the lasers, driven by different types of current pulses showed the same quantum-mechanical nature of current tuning. The theoretical model of this Nonlinear Optical Phenomenon is proposed. The estimated times of current tuning defined mainly by the photon lifetime in the cavity are about 10(-9) to 10(-12) s. The emission line-width was determined to be 20 MHz. Optimal conditions were found for the use of the lasers and were employed for the detection of NH3, CH3Cl, OCS and atmospheric water.

  • InAsSb/InAsSbP double heterostructure lasers for 3–4 μm spectral range
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2006
    Co-Authors: A P Astakhova, A. N. Imenkov, T. N. Danilova, Victor V. Sherstnev, Yu. P. Yakovlev
    Abstract:

    Abstract InAsSb/InAsSbP double heterostructure diode lasers for the spectral range of 3–4 μm grown by liquid phase epitaxy have been investigated. The laser tuning was studied as a function of the stripe width. The temperature and current tuning of such lasers was measured. Emission spectra, far-field patterns and wavelength tuning versus current have been studied in the wide current range from threshold, I th , up to 6 I th at liquid nitrogen temperature. Current wavelength tuning in single-mode lasing has been obtained both towards the shorter wavelengths (up to 4.56 cm −1 ) and towards the longer wavelengths (up to 0.9 cm −1 ) at the temperature T  = 77 K. Comparison of the emission properties of the lasers, driven by different types of current pulses showed the same quantum-mechanical nature of current tuning. The theoretical model of this Nonlinear Optical Phenomenon is proposed. The estimated times of current tuning defined mainly by the photon lifetime in the cavity are about 10 −9 to 10 −12  s. The emission line-width was determined to be 20 MHz. Optimal conditions were found for the use of the lasers and were employed for the detection of NH 3 , CH 3 Cl, OCS and atmospheric water.

  • Tunable 3.3 μm InAsSb/InAsSbP diode lasers: a new concept of fast lasing due to Nonlinear Optical effects
    Philosophical Transactions of the Royal Society of London. Series A: Mathematical Physical and Engineering Sciences, 2001
    Co-Authors: Yu. P. Yakovlev, A. P. Danilova, A. N. Imenkov, N. M. Kolchanova, Victor V. Sherstnev
    Abstract:

    InAsSb/InAsSbP double heterostructure diode lasers for the spectral range of 3.3 μm grown by liquid phase epitaxy have been investigated. Emission spectra, far–field patterns and wavelength tuning versus current have been studied in the wide current range from threshold value I th up to 3 I th at the temperature of liquid nitrogen. Controlled by current, wavelength tuning in single–mode lasing has been obtained both towards the shorter wavelengths (up to 4.56 cm−1) and towards the longer wavelengths (up to 0.9 cm−1) at the temperature T = 77 K. Comparison of the emission properties of the lasers, driven by different types of current (short pulse current, sawtooth pulse current and in quasi–continuous–wave (CW) regime) showed the same quantum–mechanical nature of current tuning. The theoretical model of this Nonlinear Optical Phenomenon is proposed. The estimated times of current tuning defined mainly by the photon lifetime in the cavity are ca. 10−9 to 10−12 s.

  • Fast tuning of 3.3 μm InAsSb/InAsSbP diode lasers due to Nonlinear Optical effects
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1999
    Co-Authors: A. P. Danilova, A. N. Imenkov, T. N. Danilova, N. M. Kolchanova, M. V. Stepanov, Victor V. Sherstnev, Yu. P. Yakovlev
    Abstract:

    Abstract InAsSb/InAsSbP double heterostructure diode lasers for the spectral range of 3.3 μm grown by liquid phase epitaxy have been investigated. Emission spectra, far-field patterns and wavelength tuning versus current have been studied in the wide current range from threshold value I th up to 3 I th , at the temperature of liquid nitrogen. Controlled by current wavelength tuning in single-mode lasing has been obtained both towards the shorter wavelengths (up to 4.56 cm −1 ) and towards the longer wavelengths (up to 0.9 cm −1 ) at the temperature T =77 K. Comparison of the emission properties of the lasers, driven by different types of current (short pulse current, sawtooth pulse current and in quasi cw regime) showed the same quantum-mechanical nature of current tuning. The theoretical model of this Nonlinear Optical Phenomenon is proposed. The estimated times of current tuning defined mainly by the photon lifetime in the cavity are about 10 −9 –10 −12 s.

  • Fast tuning of 3.3 /spl mu/m InAsSb-InAsSbP diode lasers using Nonlinear Optical effects
    IEE Proceedings - Optoelectronics, 1998
    Co-Authors: A. P. Danilova, A. N. Imenkov, T. N. Danilova, N. M. Kolchanova, M. V. Stepanov, Victor V. Sherstnev, Yu. P. Yakovlev
    Abstract:

    InAsSb-InAsSbP double heterostructures diode lasers for the spectral region 3.3 /spl mu/m grown by liquid phase epitaxy have been investigated. Emission spectra, far-field patterns and wavelength tuning have been studied over a wide current range from threshold value I/sub th/ up to 3I/sub th/ at the temperature of liquid nitrogen. Current-controlled wavelength tuning has been obtained both towards shorter wavelengths (to 4.56 cm/sup -1/) and towards longer wavelengths (up to 0.9 cm/sup -1/) at a temperature T=77 K, at lasing generation that maintains single mode. Comparison of the emission properties of lasers driven by different types of current (short pulse current, sawtooth pulse current and quasi-CW regime) showed the same quantum-mechanical nature of current tuning. A theoretical model of this Nonlinear Optical Phenomenon is proposed. The estimated times of current tuning, defined mainly by the photon lifetime in the cavity, are about 10/sup -9/-10/sup -12/ s.

Anastasia S. Gruzdeva - One of the best experts on this subject based on the ideXlab platform.

  • Formation of electromagnetic shock waves on Optical cycle during propagation of femtosecond laser pulses in transparent solids
    Nonresonant Laser-Matter Interaction (NLMI-10), 2001
    Co-Authors: Vitali E. Gruzdev, Anastasia S. Gruzdeva
    Abstract:

    There is considered formation of shock electromagnetic waves (SHEW) of visible spectral range as possible Nonlinear Optical Phenomenon taking place at laser intensity close to damage threshold induced by femtosecond laser pluses in transparent solids. Main regularities of SHEW formation are studied on the basis of 1D model of plane-wave propagation in isotropic dielectric with Nonlinear Optical responses and dispersion. Special attention is pad to influence of color dispersion on SHEW formation and propagation. Necessary conditions for appearing of SHEW are obtained, in particular, threshold amplitude is estimated. There is presented a model for numerical study of SHEW formation and propagation influenced by dispersion of linear and Nonlinear parts of effective refractive index. Using the simulation, we studied dynamics of SHEW formation on several Optical cycles near leading edge of femtosecond laser pulse propagating in transparent medium. Important observed features of SHEW are discussed.

  • Possibility of the formation of shock electromagnetic waves on Optical cycle due to the generation of higher harmonics
    Laser Optics 2000: Ultrafast Optics and Superstrong Laser Fields, 2001
    Co-Authors: Vitali E. Gruzdev, Anastasia S. Gruzdeva
    Abstract:

    There is considered formation and propagation of shock electromagnetic waves (SEW) of visible spectral range as possible Nonlinear Optical Phenomenon taking place at laser intensities characteristic of femtosecond laser interaction with transparent solids. Main regularities of SHEW formation are studied on the basis of 1D model of plane-wave propagation in isotropic dielectric with Nonlinear Optical response. Special attention is paid to influence of color dispersion and absorption on SEW formation and propagation. Necessary conditions for appearing of SHEW are obtained, in particular, threshold amplitude is estimated. There is presented an model for numerical study of SHEW formation and propagation influenced by dispersion of linear and Nonlinear pats of refractive index. Using the simulation, we studied dynamics of SHEW formation on several Optical cycles near leading edge of femtosecond laser pulse propagating in transparent medium. Important observed features of SHEW are discussed.

  • About possibility of formation of shock electromagnetic waves on Optical cycle due to generation of higher harmonics
    2001
    Co-Authors: Vitali E. Gruzdev, Anastasia S. Gruzdeva
    Abstract:

    There is considered formation and propagation of shock electromagnetic waves (SEW) of visible spectral range as possible Nonlinear Optical Phenomenon taking place at laser intensities characteristic of femtosecond laser interaction with transparent solids. Main regularities of SHEW formation are studied on the basis of ID model of plane-wave propagation in isotropic dielectric with Nonlinear Optical response. Special attention is paid to influence of color dispersion and absorption on SEW formation and propagation. Necessary conditions for appearing of SHEW are obtained, in particular, threshold amplitude is estimated. There is presented a model for numerical study of SHEW formation and propagation influenced by dispersion of linear and Nonlinear parts of refractive index. Using the simulation, we studied dynamics of SHEW formation on several Optical cycles near leading edge of femtosecond laser pulse propagating in transparent medium. Important observed features of SHEW are discussed.

  • Formation of shock electromagnetic waves during femtosecond pulse propagation in transparent solids
    Optical Pulse and Beam Propagation II, 2000
    Co-Authors: Vitali E. Gruzdev, Anastasia S. Gruzdeva
    Abstract:

    There is considered formation and propagation of shock electromagnetic waves (SEW) of visible spectral range as possible Nonlinear Optical Phenomenon taking place at laser intensities characteristic of femtosecond laser interaction with transparent solids. Main regularities of SHEW formation are studied on the basis of 1D model of plane-wave propagation in isotropic dielectric with Nonlinear Optical response. Special attention is paid to influence of color dispersion and absorption on SEW formation and propagation. Necessary conditions for appearing of SHEW are obtained, in particular, threshold amplitude is estimated. There is presented a model for numerical simulation of SHEW formation and propagation influenced by dispersion of linear and Nonlinear parts of refractive index. Using the simulation, we studied dynamics of SHEW formation on several first Optical cycles of femtosecond laser pulse in transparent medium. Important observed features of SHEW of Optical frequency are discussed. Obtained results are considered from the viewpoint of experiments on femtosecond laser interaction, in particular, laser-induced damage.

  • Formation and propagation of shock electromagnetic waves in transparent solids
    High-Power Laser Ablation II, 2000
    Co-Authors: Vitali E. Gruzdev, Anastasia S. Gruzdeva
    Abstract:

    There is considered formation and propagation of shock electromagnetic waves (SHEW) of visible spectral range as possible Nonlinear Optical Phenomenon taking place at laser intensities characteristic of femtosecond laser interaction with transparent isotropic solids. Main regularities of SHEW formation are studied on the basis of 1D model of plane-wave propagation in isotropic dielectric with Kerr Nonlinear Optical response. Necessary conditions for formation of SHEW are obtained, in particular, threshold amplitude is estimated. There is presented a model for numerical simulation of SHEW formation and propagation influenced by dispersion of linear and Nonlinear parts of refractive index. Using the simulation, we studied dynamics of SHEW formation on several first Optical cycles of femtosecond laser pulse in transparent medium. Important observed features of SHEW of Optical frequency are discussed. Obtained results are considered from the viewpoint of experiments on femtosecond laser interaction, in particular, laser damage and ablation.

Yi Liu - One of the best experts on this subject based on the ideXlab platform.

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