The Counter-Propagation Deduction (CPD) method suggested by the authors is a new one for analyzing electromagnetic (EM) field in stratified media. The mechanism or the method is briefly introduced, and the rield in a ...The Counter-Propagation Deduction (CPD) method suggested by the authors is a new one for analyzing electromagnetic (EM) field in stratified media. The mechanism or the method is briefly introduced, and the rield in a layered medium in the presence or slant incidence of a perpendicularly or parallelly polarized electric wave is investigated. Some illustrative examples show that the method is capable of providing the direct mathematic expressions of the fields in an arbitrary layer, and is convenient for numerical evaluation through an unified program, irrespective of the number of medium layers.展开更多
Here we report the theory formulation and the experiment realization of sum-frequency generation vibrational spectroscopy(SFG-VS)in the cross-propagation(XP)geometry or configuration.In the XP-SFG-VS,the visible and t...Here we report the theory formulation and the experiment realization of sum-frequency generation vibrational spectroscopy(SFG-VS)in the cross-propagation(XP)geometry or configuration.In the XP-SFG-VS,the visible and the infrared(IR)beams in the SFG experiment are delivered to the same location on the surface from visible and IR incident planes perpendicular to each other,avoiding the requirement to have windows or optics to be transparent to both the visible and IR frequencies.Therefore,the XP geometry is applicable to study surfaces in the enclosed vacuum or high pressure chambers with far infrared(FIR)frequencies that can directly access the metal oxide and other lower frequency surface modes,with much broader selection of visible and IR transparent window materials.The potential applications include surface science,material science,fundamental catalytic sciences,as well as low temperature molecular sciences,etc.展开更多
The effect of the polarizations of two counter-propagating relativistic laser pulses interacting with subwavelength thin solid-density foil is investigated.Three-dimensional particle-in-cell simulations and analytical...The effect of the polarizations of two counter-propagating relativistic laser pulses interacting with subwavelength thin solid-density foil is investigated.Three-dimensional particle-in-cell simulations and analytical modelling show that the interaction and resulting transverse instability depend strongly on the polarization directions as well as the intensity distribution of the resultant light field in the foil.The left-and right-handed circularly polarized laser pair with the same phase at the common focal spot in the ultrathin foil leads to the strongest distortion of the foil.The fastest growing mode and maximum growth rate depend mainly on the laser intensity.For all polarization and phase-difference combinations,the instability is weakest when the two laser pulses are exactly out of phase at the common focusing point in the foil.展开更多
The stabilizing process of glass particle in water by optical trap using the pulsed counter-propagating Gaussian beams is investigated. The influence of the optical power and the particle dimension on the rate and tim...The stabilizing process of glass particle in water by optical trap using the pulsed counter-propagating Gaussian beams is investigated. The influence of the optical power and the particle dimension on the rate and time of the stabilizing process is simulated and discussed.展开更多
文摘The Counter-Propagation Deduction (CPD) method suggested by the authors is a new one for analyzing electromagnetic (EM) field in stratified media. The mechanism or the method is briefly introduced, and the rield in a layered medium in the presence or slant incidence of a perpendicularly or parallelly polarized electric wave is investigated. Some illustrative examples show that the method is capable of providing the direct mathematic expressions of the fields in an arbitrary layer, and is convenient for numerical evaluation through an unified program, irrespective of the number of medium layers.
文摘Here we report the theory formulation and the experiment realization of sum-frequency generation vibrational spectroscopy(SFG-VS)in the cross-propagation(XP)geometry or configuration.In the XP-SFG-VS,the visible and the infrared(IR)beams in the SFG experiment are delivered to the same location on the surface from visible and IR incident planes perpendicular to each other,avoiding the requirement to have windows or optics to be transparent to both the visible and IR frequencies.Therefore,the XP geometry is applicable to study surfaces in the enclosed vacuum or high pressure chambers with far infrared(FIR)frequencies that can directly access the metal oxide and other lower frequency surface modes,with much broader selection of visible and IR transparent window materials.The potential applications include surface science,material science,fundamental catalytic sciences,as well as low temperature molecular sciences,etc.
基金supported by the National Natural Science Foundation of China(Grant Nos.12175310,12275356,12305268,12105362,12375244,12135009 and U22411281)the Natural Science Foundation of Hunan Province(Grant Nos.2021JJ40653,2020JJ5031 and 2025JJ30002)+1 种基金the Scientific Research Foundation of the Hunan Provincial Education Department(Grant No.22B0655)the Hunan Provincial Innovation Foundation for Postgraduates(Grant No.CX20210006)。
文摘The effect of the polarizations of two counter-propagating relativistic laser pulses interacting with subwavelength thin solid-density foil is investigated.Three-dimensional particle-in-cell simulations and analytical modelling show that the interaction and resulting transverse instability depend strongly on the polarization directions as well as the intensity distribution of the resultant light field in the foil.The left-and right-handed circularly polarized laser pair with the same phase at the common focal spot in the ultrathin foil leads to the strongest distortion of the foil.The fastest growing mode and maximum growth rate depend mainly on the laser intensity.For all polarization and phase-difference combinations,the instability is weakest when the two laser pulses are exactly out of phase at the common focusing point in the foil.
文摘The stabilizing process of glass particle in water by optical trap using the pulsed counter-propagating Gaussian beams is investigated. The influence of the optical power and the particle dimension on the rate and time of the stabilizing process is simulated and discussed.
