30 September 2017, Volume 29 Issue 3
    

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  • Study of the High-order Optical Parameter of Scattering Phase Function
    The Journal of Light Scattering. 2017, 29(3): 191-196. https://doi.org/10.13883/j.issn1004-5929.201703002
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  • Study on the Scattering Characteristics Mechanism of Random Rough Surfaces
    The Journal of Light Scattering. 2017, 29(3): 197-202. https://doi.org/10.13883/j.issn1004-5929.201703003
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    To study random rough surface scattering distribution characteristics and influence factors of distribution characteristics, linear filtering method is used to generate Gaussian random rough surface, and Monte Carlo numerical method based on Kirchhoff Approximation is deduced to calculate the scattering light intensity spatial distribution from one set random metal and one set dielectric rough surfaces illuminated by S and P polarized light. The three characteristics of the scattering light intensity distribution peak, the intensity distribution width and the position of peak are reviewed. Numerical calculation results show that significant differences between scattering characteristics of metal surfaces and the dielectric surfaces exist. The light scattering characteristics are jointly influenced by the slope distribution and reflectance of surface element. The random rough surface scattering light intensity distribution is affected by common influence of surface element slope distribution and surface element reflectivity of random surface, and good consistency between the common influence result and numerical calculation result.
  • Joint Inversion of Radiative Properties of Anisotropic Medium
    The Journal of Light Scattering. 2017, 29(3): 203-209. https://doi.org/10.13883/j.issn1004-5929.201703004
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    The joint inverse model of radiative characteristic parameters of anisotropic scattering medium was established used BP neural network method combined with the Monte Carlo method and BEER law. Firstly, the scattering and absorption coefficients of the isotropic medium were inversed by the combination of the hemispherical transmittance and reflectance, then the collimated transmittance was added to the measurement parameters. The absorption coefficient, scattering coefficient and scattering asymmetry factor of anisotropic medium were inversed by the joint inverse model based on the hemispherical transmittance, reflectance and collimated transmittance. The inverse results show that this model, which has practical significance, can inverse three radiative characteristic parameters of anisotropic medium accurately. What’s more, the measurement error was taken into account. In the case of different degree of measurement error, the results show that the measurement error has a great influence on the inversion of the scattering asymmetry factor.
  • Phosphorus doping to improve the Surface-enhanced Raman scattering property of TiO2 in TiO2/MBA/Ag sandwich structure
    The Journal of Light Scattering. 2017, 29(3): 210-215. https://doi.org/10.13883/j.issn1004-5929.201703005
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    In this paper, P doping TiO2 were synthesized by using H3PO4 as phosphorus source via a facile sol-hydrothermal process, and silver nanoparticles were synthesized by Lee and Meisel method. We choose 4-Mercaptobenzoic acid (4-MBA) as the probe molecule to build TiO2/MBA/Ag sandwich structures as active substrates for surface-enhanced Raman scattering (SERS). The samples were characterized for morphology, structure, optical property and surface chemical composition by Transmission Electron Microscope (TEM), X-Ray Diffraction (XRD), (X-Ray Photoelectron Spectroscopy (XPS), UV–visible diffuse reflectance spectra (DRS) and Raman spectroscopy. It shows that the crystal size of TiO2 was about 6-12 nm and P doping could not influence the phase of the crystal. XPS revealed that P5+ replace Ti4+ and doping into the crystal lattice by forming O-P-O. The Raman result shows that P doped TiO2 has a higher intensity of Raman signals in P-TiO2/MBA/Ag sandwich structures than that in pure TiO2/MBA/Ag, the 1.77% P-TiO2 own the strongest Raman signals than any other samples, this is due to phosphorus doping which narrow the energy band gap of TiO2 and abundant the surface states, these were profitable for TiO2 to MBA molecule charge transfer process.
  • Substrates of Silver Nanoparticles on Different Plates for Surface Enhanced Raman Spectroscopy
    The Journal of Light Scattering. 2017, 29(3): 216-221. https://doi.org/10.13883/j.issn1004-5929.201703006
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    We prepared the flower-like silver nanoparticles by using chemical reduction method and deposited it on silicon wafer, TiO2 film and glass plate (AgNP@Si, AgNP@TiO2, AgNP@G) separately in order to get substrates for surface enhanced Raman spectroscopy. The repeatability, sensitivity and uniformity of these substrates were studied by using R6G solution. The detection limit of AgNP@TiO2 and AgNP@Si was 10-8 mol·L-1, while the AgNP@G was 10-7 mol·L-1. Meanwhile, Repeatability and uniformity of AgNP@Si are better than others. The results show that the AgNP@Si has the best Raman enhancement effect, the simple preparation, good repeatability and uniformity.
  • The Absorption Characteristics of Ag/Si Core-Shell Nanoparticle Clouds
    The Journal of Light Scattering. 2017, 29(3): 222-227. https://doi.org/10.13883/j.issn1004-5929.201703007
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    Localized surface plasmon resonance (LSPR) can be excited on metal nanoparticles. The LSPR occurs when the oscillation frequency of electrons is equal to that of the incident light. At this frequency, the absorption of metal nanoparticles can be strengthened. The LSPR effect has been applied to the surface-enhanced Raman scattering (SERS). In this study, absorption of Ag-Si core-shell nanoparticle clouds is investigated. The finite-difference time-domain method is applied to obtain the absorption of particulate media, with core-shell nanoparticle randomly distributed. Effects of particle volume fraction, core and shell radii, spherical and ellipsoidal shapes are analyzed. Tuning of absorption peaks by different factors is also discussed.
  • Database Foundation of Raman Spectra of Explosives and Drugs and the Information Search System
    The Journal of Light Scattering. 2017, 29(3): 228-233. https://doi.org/10.13883/j.issn1004-5929.201703008
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    31 kinds of explosives and 73 kinds of drugs were recorded the Raman Spectrum, the correct region of Raman spectrum was selected to be the normal to used in database. Database of normal Raman spectrum and information search system is build by software. In correct information of Raman frequency shift and height is recorded in the database. The Raman spectrum of unknown was compared with region of Raman spectrum, Raman peaks that are strong, are curve fitted, then the with the normal Raman spectrum in the database by information search system, the result is correct. The database has the function of add, delete, back up, recover and subtract baseline. Some facts will influence the search result is analyzed.
  • Study on Blue Gel Pen Inks Based on Raman Spectroscopy and Multivariate Statistical
    The Journal of Light Scattering. 2017, 29(3): 234-238. https://doi.org/10.13883/j.issn1004-5929.201703009
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    As a non-destructive analysis technology，Raman spectroscopy, has been widely used in writing materials analysis in the field of document examination in recent years. The main method to identify the inks by Raman spectrum is direct comparison of the number, the position and the feature of peak. Chemometrics is the discipline that creates a link between measured values and the system state in chemical system through statistical or mathematical method, which can be used for the analysis of spectral data. This study was combined the similarity analysis and principal component analysis (PCA) in chemometrics with Raman spectra data of 28 blue gel pen inks collected on market. The results of classification by two analysis methods were almost accordant, which the 28 blue gel pen inks could be divided into five categories using two methods. The results showed that the data obtained from Raman spectroscopy combined with chemometrics analysis method for data analysis and identification, was more objective and accurate than the direct comparison of spectra.
  • In Situ Research on Alpinia galanga(L.) Willd and Alpinia conchigera Griff Oil Cell with Raman
    The Journal of Light Scattering. 2017, 29(3): 239-242. https://doi.org/10.13883/j.issn1004-5929.201703010
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    In order to identify the essential oils ingredient in oil cells at room temperature, utmost avoid active change of essential oil ingredient and avoid sample pretreatment and extractions which can be labor intensive, this article presents a novel and original approach to analyze in situ the main components of the essential oils in Alpinia galanga(L.) Willd and Alpinia conchigera Griff oil cells by means of Raman spectroscopy. Fresh samples were prepared by free-hand section. Under the DXR Laser confocal micro Raman spectrometer, the oil cells can be seen with objective lens of 20.The two sample have similar Raman spectrum, high intensity bands are present at  1636/1643、1605/1607、1291/1293、1199/1204、1168/1168 cm-1，middle intensity bands are present at 1585/-、1439/1437、1308/-、907/908、856/856、797/788、731/732、632/633cm-1 .Its means that the two sample have the same principal component. It has been found that the Raman spectrum of two sample correlate very well with 1’ -acetoxychavico lacetate(ACA) Raman spectrum. There are main 16 spectroscopic bands in the Raman spectrum of ACA. The 18 presented spectroscopic bands of Alpinia conchigera Griff oil cell there are 15 bands correlate very well with ACA. But for Alpinia galanga(L.)Will 19 bands there are 14 bands correlate very well with ACA .The Raman spectroscopy of ACA was calculated by Density Functional Theory (DFT). The Raman spectroscopic bands were assignment with the help of calculation.

  • Effects of the Degree of Non-spherical Particles on Extinction Coefficient
    The Journal of Light Scattering. 2017, 29(3): 243-251. https://doi.org/10.13883/j.issn1004-5929.201703001
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    The aerosol properties in northern subsurb of Nanjing is measured regularly by micro-pulse lidar of Nanjing comprehensive observation base of China Meteorological Administration.We caculated the depolarization ratio and the extinction coefficient of the aerosol,respectively acquired the profiles of depolarization ratio and extinction coefficient.We analysed the relationship of the variation trend between the depolarization ratio and the extinction coefficient,and we finally found the certain correlation existing between those two factors.Preliminary detection results showed that:at the same time,the variation trends of the two are the same on sunny and haze days, and are also the same when the ice clouds is detected, while the trends are opposite when the water clouds is detected.In other words,when detecting aerosol and ice clouds,particles of the non-spherical feature is apparent, extinction coefficient is larger;when detecting water clouds,particles of the spherical feature is apparent, extinction coefficient is larger.
  • The Effect of Relative Humidity on the Extinction Coefficient of Aerosols
    The Journal of Light Scattering. 2017, 29(3): 251-256. https://doi.org/10.13883/j.issn1004-5929.201703011
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    The extinction coefficient is one of the critical parameters of the aerosols optical properties. In this study, the influence of relative humidity on the extinction coefficient of spherical particles has been carefully investigated, based on combining the Mie scattering theory with the humidity growth model of the particle size and the refractive index. The results indicate that the particle size increases and the refractive index decreases with the increase of relative humidity in the range 60%-95% when the incident wavelength is 808nm, which leads to the right shift of the extinction coefficient curve as well as the more obvious fluctuation of the curve. Furthermore, the extinction coefficient of small particles exponentially increases with the increase of relative humidity, while that of the larger particle decreases with small fluctuations. In addition, the law between the extinction coefficient and the relative humidity for small particles remain unchanged under different incident light conditions. The results of this work provide an important theoretical guidance for the study of the optical properties of aerosols and the atmospheric environmental quality.
  • Forensic Differentiation of Copy Paper by Infrared Spectroscopy
    The Journal of Light Scattering. 2017, 29(3): 257-260. https://doi.org/10.13883/j.issn1004-5929.201703012
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     In this paper, we make use of infrared spectroscopy with ATR to study copy papers which often appear in the criminal scene, 62 similar type of copy papers from different areas were characterized by infrared spectroscopy. The ratio of the peak area of cellulose and inorganic filler was established as a new method for the identification of copy papers, the degree of differentiation reached 91.96%, which reached the purpose of non-destructive, rapid and accurate inspection.
  • Spectral Unmixing of Mineral Pigment Mixture by Using Derivative of Ratio Spectroscopy Based on the Mode
    The Journal of Light Scattering. 2017, 29(3): 261-265. https://doi.org/10.13883/j.issn1004-5929.201703013
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    In the field of cultural relics restoration，to determine the proportion of mixed pigment has been a troublesome thing. The traditional cultural relics repair method is usually based on the repair worker’s experience，in which efficiency is not high. By improving the method of selecting characteristic bands，the derivative of ratio spectroscopy based on the mode is proposed. The simulation data and real data results show that this method can reduce the test range of color in the repair process，improve the unmixing accuracy，which might have great potential application in the analysis of cultural relics pigments recognition.
  • Rotation Analysis of Unstable Spaces Based on Optical Scattering
    The Journal of Light Scattering. 2017, 29(3): 266-270. https://doi.org/10.13883/j.issn1004-5929.201703014
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    On the basis of optical scattering properties, the paper proposes an experimental simulation scheme and a data processing method to calculate the rotation rate of the spatial instability target, which is also successfully inverted. The experiment systematically simulates the actual optical observation. Therefore, satellite model attitude, solar azimuth and detector observation angle are the same as what STK simulated respectively. Moreover, the detection process of STSS satellites with low orbit is simulated. The data is collected from multiple experimental periods and analyzed by spectral analysis, autocorrelation analysis and crossover residual method, all of which can invert the rotation rate of the model satellite. Using crossover residual method, however, is found least interfered and delivers the most accurate results. The paper provides data ground for the future research on rotation rate of the spatial instability target on the basis of optical scattering properties.
  • Simulation Study of Influence on Relationship between Energy Band Structure and Spectral Characteristics of Blue GaN-Based LED
    The Journal of Light Scattering. 2017, 29(3): 271-276. https://doi.org/10.13883/j.issn1004-5929.201703015
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    GaN based InGaN / GaN quantum well blue light-emitting diode (LED) structure was used to research theoptical properties bythe Silvaco TCAD software in this paper. The results reveal that, the peak value of spectrum with higher applied voltage shifted to lower wavelength (blueshift), and another peak arisen at 0.365μm. The luminous efficiency increased rapidly when the forward current was small and gradually became saturated with the further increase of the forward current. The sample with higher In fraction and thicker well width shown red shift and lower luminous efficiency. The simulation results provide some basis reference for the design and optimization of blue LED with InGaN / GaNquantum well structure.
  • Realization of Plasmon Induced Transparency with Metamaterials
    The Journal of Light Scattering. 2017, 29(3): 277-284. https://doi.org/10.13883/j.issn1004-5929.201703016
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    Electromagnetically induced transparency is a quantum interference effect in a material that is induced by two different incident light. With its unique physical phenomena, it plays an important role in the application of quantum communication and nonlinear optics. In recent years, artificial metamaterials have developed rapidly and become a hotspot in the field of plasma science. Metamaterials can be used to control the physical structure and characteristic. Besides, it reduces the requirement of experiment, simulating a phenomenon similar to electromagnetic induced transparency, namely, plasmon induced transparency. This paper introduces the basic principle of plasmon induced transparency, summing up several structures of plasmon induced transparency, and its recent development, providing the basis for micro sensor applications as well as the design of plasmon induced transparency structure.
  • The Simulation Research of Total-Reflection X-Ray Fluorescence Analysis Technology Applied in Measurement of Galvanized Sheet Layer
    The Journal of Light Scattering. 2017, 29(3): 285. https://doi.org/10.13883/j.issn1004-5929.201703017
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    This paper analyzes the traditional X-ray fluorescence method to measure the zinc layer thickness of galvanized sheets layer. It proposes a measuring method of galvanized zinc layer based on total reflection X-ray fluorescence analysis technology, and the X-ray total reflection model is set up for simulation in the MCNP. When the X-ray total reflection occurs, zinc layer will almost make the X-ray source reflect completely, associated with a small amount of X-ray fluorescence producing in the normal direction of the galvanized sheet. Using this X-ray fluorescence to analyze directly can effectively reduce the scattering background of source X-ray, improve the accuracy of measurement and reduce the required source X-ray energy. The Simulation results demonstrate that the feasibility of the X-ray total reflection on galvanized sheet, it provides the theoretical basis for practical application.
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