30 December 2017, Volume 29 Issue 4
    

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  • Analysis on Structured Light Reconstruction Method and Characteristics through Scattering Medium
    The Journal of Light Scattering. 2017, 29(4): 291. https://doi.org/10.13883/j.issn1004-5929.201704001
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    The structured light experiences multiple scattering when passing through biological tissue, dust and other strong scattering medium. The original phase and direction of propagation are changed, and coherence is destroyed, too. Finally, speckle is formed. In this paper, the characteristics and applicability of the reconstruction of structured light are analyzed. Stripe structured light is used to pass through scattering medium as the incident light. Direct inverse method, phase conjugation method and TVAL3 method are adopted to restructure the incident light. The reconstruction results of three methods are analyzed under different measurement noise levels. Simulation results show that: the reconstruction result of direct inverse method is superior to the others when the measurement noise level is 0. And the reconstruction result of TVAL3 method is more perfect when measurement noise exists and under level 0.025 I. However, the reconstruction result of phase conjugation method is poor all through. Meanwhile, the reconstruction of single point and three points light source are realized by the three methods in this paper.
  • Effect of Orientation Numbers on Optical Properties of Nonspherical Dust Aerosols
    The Journal of Light Scattering. 2017, 29(4): 297. https://doi.org/10.13883/j.issn1004-5929.201704002
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    Orientation-averaged optical properties of spheroid dust aerosol particles are carried out based on discrete dipole approximation for size parameters from 0.1 to 23 (corresponding to effective radius from 0.01 to 2 μm at wavelength of 550 nm). The effects of orientation numbers on optical properties of nonspherical dust aerosols are carried out by using different orientation numbers. For monodisperse particles, optical properties of dust spheroid are sensitive to the orientation when using few orientation numbers. However, for polydisperse particles, they are less sensitive to the orientation with the effect of size distribution. For the effect of asphericity degree, the larger it is, the more orientation numbers should be utilized for orientation-averaged optical properties. Take the polydisperse spheroid dust particle as an example, to obtain the orientation-averaged extinction efficiency factor, single scattering albedo and asymmetry parameter (differences less than 1%), the orientation number should be larger than 500 for the aspect ratio of 16, but it is larger than 100 for the aspect ratio of 2.
  • The SERS Spectra Detection of Norfloxacin on Silver Nanowires Substrate
    The Journal of Light Scattering. 2017, 29(4): 303. https://doi.org/10.13883/j.issn1004-5929.201704003
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    In this paper, silver nanowires (AgNWs) were synthesized by a polyol process using AgNO3 as silver source, characterized by scanning electron microscope and UV-vis Spectrophotometer. It shows that the diameter and length of the AgNWs are uniform. The Raman signal were obtained using a handheld Raman spectrometer equipped with a 785 nm incident laser, The results show that the base has a good SERS effect, and the enhancement factor is achieved 1.44×107，When the concentration of 10-3~10-8 mol/L norfloxacin solution was measured, the concentration and intensity of the characteristic peaks were linearly fitted and found to have a good linear correlation. The correlation coefficient R2 was 0.941 01. In order to detect the dispersion of AgNWs on glass, six points were randomly picked on the substrate to obtain the Raman signal of norfloxacin solution (10-3 mol/L). To test the reproducibility of the spectrum, six Raman spectra of norfloxacin solution (10-5 mol/L) samples were detected. The experimental results show that the AgNWs have the better dispersion on the glass and a good spectrum reproducibility in testing norfloxacin
  • SERS Detection of Pesticide Residues by Au-Ag Alloy Nanourchin Structure
    The Journal of Light Scattering. 2017, 29(4): 309. https://doi.org/10.13883/j.issn1004-5929.201704004
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    The SERS detection of organophosphorus pesticide ethyl paraoxon and organochlorine pesticides r-666 were achieved by the high-density Au-Ag alloy nanourchin as SERS substrate. The Ag nanoparticles were synthesized firstly, then L-dopa was used to reduce the Ag nanoparticles, and ultimately the formation of Au-Ag alloy nanourchin structure. Using this high density tipped structure as the SERS substrate to detect the organophosphorus pesticide ethyl paraoxon and organochlorine pesticides r-666 on the portable Raman spectrometer, and the results showed high sensitivity. Therefore, our platform for the detection of pesticide residues provide a simple, convenient and high sensitivity method.
  • Synthesis and Optical Properties of Magnetic Responsive Agarose Photonic Hydrogel
    The Journal of Light Scattering. 2017, 29(4): 314. https://doi.org/10.13883/j.issn1004-5929.201704005
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    In this paper, a novel magnetic responsive photonic hydrogel was prepared by embedding monodisperse Fe3O4 colloidal particles into network of agarose matrix, and its optical properties was investigated. First, carboxyl decorated Fe3O4 colloidal particles were synthesized through a hydrothermal method. Then the Fe3O4 colloidal particles were dispersed in water to form homogeneous colloidal solution. After mixing the colloidal solution with agarose monomer and then complete cross-linking polymerization, a uniform composite agarose hydrogel containing Fe3O4 particles can be obtained. With large pore size of agarose gels, the Fe3O4 particles in agarose matrix are still movable and colloidal crystal arrays can be achieved under external magnetic field. Moreover, the structural color of the gel can be tuned continuously by changing the strength of magnetic field. As-prepared photonic hydrogels, with dynamically tunable structural colors, provide great opportunities for applications of colloidal photonic crystals.
  • Fabrication of Silicon Nanocrystals by Low Temperature Eutectic Alloying and Their Characterization
    The Journal of Light Scattering. 2017, 29(4): 320. https://doi.org/10.13883/j.issn1004-5929.201704006
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    Taking advantage of the eutectic points of Au/Sb and Au/Si at low temperatures, silicon nanocrystals doped with Sb atoms are fabricated on the surface of silicon wafers after an alloying reaction around 400 ℃. Scanning electron microscopy demonstrates that there exist craters in the shape of an inverted pyramid and large amount of nanostructures inside craters on the wafer surface due to Au/Si alloying reactions. Raman scattering spectroscopy verifies that these nanograins largely possess a crystal-like lattice structure. Secondary ion mass spectroscopy reveals that the doping concentration of Sb in Si exceeds 2×1018 cm-3, surpassing the solid solubility of Sb in the bulk silicon crystal. This growth method is easy to implement with a low thermal budget, which potentially provides it the good compatibility with other micro/nano fabrication processes.

  • Quantum Plasmons in Single-layer Boron Phosphide Nanostructures
    The Journal of Light Scattering. 2017, 29(4): 325. https://doi.org/10.13883/j.issn1004-5929.201704007
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    Plasmons in single-layer Boron phosphide (BP) nanostructures is studied on the basis of time-dependent density functional theory (TDDFT). There are two plasmon bands in the single-layer BP nanostructures, one around 3 eV and the other around 9 eV, and the strong plasmon resonances in the visible region of the spectrum of the single-layer BP nanostructures is obstained. The edge configuration (the armchair-edge and the zigzag-edge) and the boundary width along the direction of impulse excitation polarizes plays an important role in the absorption spectrum of the single-layer BP nanostructures. The plasmon resonance mode is a long-range charge transfer excitation in the single-layer BP nanostructures.
     
  • Theoretical and Experimental Investigation on Vibrational Spectroscopy of D-methamphetamine
    The Journal of Light Scattering. 2017, 29(4): 332. https://doi.org/10.13883/j.issn1004-5929.201704008
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    The Raman spectrum and Infrared spectrum of d-methamphetamine were selected by laser confocal micro-Raman spectroscopy and micro-IR spectroscopy. Geometry structure of d-methamphetamine was optimized by density functional theory(DFT) using B3LYP/6-311G++（d,p）. Meanwhile, Raman spectra and IR spectrum of d-methamphetamine were calculated. The results showed that the theoretically calculated spectra were in agreement with the obtained experimental spectra，and on this basis vibrational modes were assigned by soft of Gaussview. This work provides a strong theoretical basis for identification of d-methamphetamine and also supplies significant reference for the spectroscopy research of amphetamine drugs.
  • Raman Analysis of the Lead Pigments of Kumutula Grotto Murals, Xinjiang, China
    The Journal of Light Scattering. 2017, 29(4): 338. https://doi.org/10.13883/j.issn1004-5929.201704009
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    Light microscopy, scanning electron microscopy, and Raman spectra were applied to analyze the lead pigments in Kumutula Grotto murals.The results show that the brown black pigment was lead dioxide and red lead, orange red and brown red pigments were red lead. The key point of the lead pigments was the selection of appropriate laser wavelength and power .The lead pigments was stable when analysed with a laser beam of longer wavelength and suitably low power. Meanwhile, the discoloration of red lead was discovered.
  • Simulation Study of Lidar Detection of the Depolarization Ratio of Adiabatic Water Clouds
    The Journal of Light Scattering. 2017, 29(4): 343. https://doi.org/10.13883/j.issn1004-5929.201704010
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    We simulated the depolarization signal in adiabatic water clouds due to the occurrence of multiple scattering when measure the microphysics characteristics using depolarization lidar. The number density of the adiabatic water clouds is constant in vertical direction. The liquid water content and the effective radius are nonlinear increasing with the height, and the varying rule is controlled by the barometric pressure, temperature, and the thermodynamic formulas. The wavelength of the lidar is chose as 0.355 μm. From the computing results, we can see that depolarization ratio increasing with the depth of the cloud, and it increasing with the receiving field of view angle, but it has great difference with the homogeneous cloud. The effective radius of the cloud with clouds base height is 2 km are less than the one with cloud base height is 1 km, so the depolarization ratio is also small with same number density and observation conditions.
  • Mini UV Raman Spectrometer
    The Journal of Light Scattering. 2017, 29(4): 348. https://doi.org/10.13883/j.issn1004-5929.201704011
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    UV Raman Spectrometer with it intrinsic high sensitivity and lower stray light has attracted much attention in in situ detection of explosives, pollutants and pesticide residues. However, the current commercialize portable Raman spectrometer is excited with visible or IR laser. Herein, we reported a new type of portable UV Raman Spectrometer with the coma abbreviation design through well designed lens system. The spectrometer shows high resolution and wide spectra collection range.
  • Two-Dimensional Infrared Spectra Study of Solid Phase of Glucose Isomer
    The Journal of Light Scattering. 2017, 29(4): 354. https://doi.org/10.13883/j.issn1004-5929.201704012
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    The solid phase glucose structure had been studied by fourier transform attenuated total reflection infrared spectroscopy (ATR-FTIR). The OH stretch vibration (νOH), CH2 asymmetrical stretching vibration (νasCH2), CH2 symmetrical stretching vibration (νsCH2) , CH2 scissoring vibration (δCH2), C-O stretch vibration (νC-O), O-H in-plane bending vibration (δOH), glucose skeleton vibration mode（νⅠ) and glucose skeleton breathing vibration(νⅢ) were found. The solid phase glucoses νⅠ and νⅢ had been discussed by two-dimensional infrared spectroscopy (2D-IR). The α-D-glucopyranose and β-D-glucopyranose were discoverd and influence of temperature change on solid glucose structure was researched by 2D-IR also.
  • Experimental on the Characteristics of Polarized Laser Propagation in Non-Spherical Media
    The Journal of Light Scattering. 2017, 29(4): 361. https://doi.org/10.13883/j.issn1004-5929.201704013
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    The properties of non-spherical particles have important applications in many fields such as atmospheric sciences, oceanography, ecology, physics, optics. The study of the properties of the non-spherical particles has been the focus of international research. In this experiment, we use a new chemical method synthesis ellipsoidal non-spherical particle which a/b(horizontal and vertical ratio) is 1.6 and take this particle as the medium ,produce different concentrations of non-spherical particles in the smog chamber by using the oil mist machine, with different wavelengths of laser (532 nm, 671 nm) as the incident light under uniform conditions, through attenuation film, polarizer and 1/4 wave plate, and to rotate the polarizer to the incident light into 0 degrees, 45 degrees and left-hand polarized light. The wavelength, incident angle and the volume concentration of the non-spherical medium are taken as variables, to study the change situation of degree of polarization (DOP), polarization angle (AOP) and intensity (I), obtain the variation law of polarization transmission characteristics and the pros and cons in performance of guaranteed degree of polarization, provide data and theory for the research on the properties of the non-spherical.
  • The Analytical Formula Research of the Overlap Factor of Off-Axis Lidar
    The Journal of Light Scattering. 2017, 29(4): 367. https://doi.org/10.13883/j.issn1004-5929.201704014
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    In order to correct the near-range signal of off-axis Lidar, according to the definition of overlap factor, using the intensity propagation equation of Gaussian beam, and considering the five relationships between laser beam distribution and telescope field of view, we obtain the analytical formula of the overlap factor of an off-axis lidar, which is expressed as a function of the lidar system parameters. Based on the formula the lidar return signal in Macao is corrected and retrieved. The result shows the validity of the formula obtained in the paper. The influence of the lidar system parameters on the overlap factor is studied numerically by using the analytical formula. And a result is obtained, which is of reference value to the design of a laser lidar system. 
  • Precise Measuring of Crystals by X-Ray Laser Apparatus Interference
    The Journal of Light Scattering. 2017, 29(4): 372. https://doi.org/10.13883/j.issn1004-5929.201704015
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     Based on the advantages of short X-ray laser pulse, excellence monochromaticity, high energy and superior coherence, X-ray laser interferometry is proposed to measure crystal structures and defects in this paper. As the X-ray laser apparatus wavelength of the order of 10-10 m, high-precision measurement can be realized. In addition, X-ray laser measurement of crystal devices system, defective crystal measurement model and crystal parameter measurement model are provided in this paper.
  • Process Optimization of the Residual Stress by Reverse-Epitaxial Growth 3C-SIC Film
    The Journal of Light Scattering. 2017, 29(4): 376. https://doi.org/10.13883/j.issn1004-5929.201704016
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    In order to improve the residual stress and optimize the process conditions of reverse epitaxial 3C-SiC thin films，the 3C-SiC film based on the n-Si (111) was prepared with the methane and hydrogen mixture at the ratio of 1:10 using LPCVD technology. The 3C-SiC films were characterized by X ray diffraction, laser Raman spectroscopy and field emission scanning electron microscopy.  The experimental results show that the optimum reaction temperature is 1200℃, and the reaction temperature either too high or too low is not conducive to grow 3C-SiC film. When the reaction temperature is 1200 ℃, the film thickness and the concentration of defects will increase correspondingly with the increasing reaction time, so that the crystalline quality of the film can be decreased accordingly. However, when the reaction temperature is 1250 ℃, increasing the reaction time will not only increase the thickness of the film, but also reduce the residual stress in the film, and improve the crystalline quality of the film. In addition，the results show that the process of constant temperature and constant time annealing can further reduce the intrinsic residual stress, improve the crystalline quality of the thin film and crystal lattice mismatch.
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