30 June 2017, Volume 29 Issue 2
    

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  • Impacts of the Strain on Band Structures of Two-Dimensional Photonic Honeycomb Lattices
    WANG Yaole，XU Gongjie
    The Journal of Light Scattering. 2017, 29(2): 97-101. https://doi.org/10.13883/j.issn1004-5929.201702018
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        Based on plane wave method, the impacts of strain on band structures of two-dimensional photonic crystal with honeycomb lattices are studied numerically in this work. The directions of strain are assumped to be along zigzag and armchair boundary, and the range of uniaxial deformation is 20%. The bandstructure change obviously since strain-induced symmetry breaking. For the strain along zigzag direction, the gap of TE mode decreases with the stretching of crystal lattice, while the gap of TM mode disappears when the strain is over 16%. As for the strain along armchair direction, the gap of TE mode gradually decreases when the compressed strength is over 15% and keeps almost rubust for other strain case; the gap of TM mode vanishes for a strain larger than 18%. These results play an important role in improving strain engineering and designing two-dimensional photonic devices.
  • A Numerical Study of Dependencies of Aerosol Scattering and Absorption on Its Refractive Index
    ZHANG Xiaolin, MAO Mao, YIN Yan
    The Journal of Light Scattering. 2017, 29(2): 102-106. https://doi.org/10.13883/j.issn1004-5929.201702005
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        The dependencies of aerosol scattering and absorption properties on its refractive index for size parameters from 0.1 to 100 are numerical investigated. Aerosol real part and imaginary part of refractive index affect both scattering and absorption properties, since they are an organic whole. For ambient aerosols, the retrieved effective refractive index is unique for small particles in nucleation and accumulation models. However, if abundant coarse particles exist, the dependency of aerosol scattering and absorption on its refractive index is complex with the effective refractive index retrieved only in proper database.
  • Research of Non-Coplanar Ultraviolet Non-Line-of-Sight Single Scattering Link Model
    HE Hua
    The Journal of Light Scattering. 2017, 29(2): 107-113. https://doi.org/10.13883/j.issn1004-5929.201702003
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       Based on Ultraviolet Non-line-of-sight Single Scattering Link in coplanar Model, this paper analyzed non-coplanar mode when transmitter and receiver do not face each other. Three non-coplanar cases are analyzed in this paper, one is either of transceiver does not face the other part, one is both of transceiver do not face each other. This paper mainly analyzes three non coplanar cases, the first kind is either part faces to the other part; The other two kinds are both parts do not face to each other on the same side and different sides. The simulation show that the former two kinds can communicate, but receiving power is not very high. The third kind can not communicate, because it is difficult to form a common scattering volume in the air.
  • Preparation and Investigation of a High Activity Silver Nanoparticles SERS Substrate
    The Journal of Light Scattering. 2017, 29(2): 114-118. https://doi.org/10.13883/j.issn1004-5929.201702006
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    A homogeneous monolayer film of the silver nanoparticles was prepared, and a highly active surface-enhanced Raman scattering substrate was obtained. Using rhodamine 6G (R6G) as a probe molecule, the SERS characteristic of the silver nanoparticles monolayer film was compared with both SERS substrates by direct dropping silver colloid mixing with and without R6G, respectively. It was found that the monolayer film exhibited a high sensitivity (The detection limit of R6G was 10-9 mol/L) and reproducibility. The enhanced reason was analyzed by finite difference time domain (FDTD) method. The results showed that the experimental results and theoretical simulation were in line.
  • Surface-Enhanced Raman Spectra Studies of m-Hydroxybenzoic Acid Based on Density Functional Theory
    The Journal of Light Scattering. 2017, 29(2): 119-123. https://doi.org/10.13883/j.issn1004-5929.201702007
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    In this paper, both Normal Raman Scattering (NRS) spectroscopy and the Surface-enhanced Raman Scattering (SERS) spectroscopy that adsorbed on silver nanoparticles of m-hydroxybenzoic acid (MHBA) were researched. At the B3LYP/6-31+G**(C、H、O)/LANL2DZ(Ag) level, Density Functional Theory (DFT) method was used to optimize molecular configurations of MHBA. Based on optimized structure, the NRS spectroscopy and the SERS spectroscopy by different adsorption configurations of MHBA had been calculated all. Compared with the experimental data, the calculation results using MHBA molecular adsorption configuration through both carboxyl and hydroxyl groups were much more matched with experimental values than those of through carboxyl. At the end, comprehensive assignments of the vibration mode for MHBA were studied by the software of GaussView.
  • Density Functional Theory Study Raman Spectrum of Amitrole
    The Journal of Light Scattering. 2017, 29(2): 124-128. https://doi.org/10.13883/j.issn1004-5929.201702008
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    Raman scattering spectra and optimized geometries of the amitrole(AT) molecule and AT-Ag2 complex have been calculated using density functional theory (DFT) wtih B3LYP functional at the level of 6-31++g(d,p) set for C，H，N atoms and LanL2DZ for Ag respectively in this paper. Raman spectra was obtained from the calculation result of the frequencies, the vibrational mode was assigned on the basis of potential energy distribution (PED). The molecular electrostatic potential and HOMO-LUMO orbital energy of AT was obtained. The excited states of AT and AT-Ag2 complex were calculated using time-dependent density functional theory(TDDFT).
  • Establishment and Application of Narrow-band TLC-SERS
    ZHANG Binbin, SHI Yi, ZHU Qingxia, CHEN Hui，LU Feng
    The Journal of Light Scattering. 2017, 29(2): 129-132. https://doi.org/10.13883/j.issn1004-5929.201702017
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    The narrow-band thin layer chromatography combing with surface enhanced Raman spectroscopy (narrow-band TLC-SERS) method was established to further improve the sensitivity of conventional TLC-SERS method, which can restrain transverse diffusion of analytes in TLC development and overcame the second diffusion of analytes attributed to adding SERS-active substrate. In this work, the narrow-band TLC plate with width of 2 mm was prepared using the silica gel GF254 as stationary phase. After the sample applied on the narrow-band TLC plate, the silver colloid was deposited on the surface of separated spots, and then the spots were detected by portable Raman spectrometer. The results indicate that the narrow-band TLC-SERS method is simple, rapid and sensitive. Furthermore, this method not only restrains the defect of the transverse diffusion of analytes in TLC development but also saving the cost. Thus, the narrow-band TLC-SERS method has good prospects for application.
  • A Study on the Vibrational and Structural Behavior of KBrO3 at High Pressure
    The Journal of Light Scattering. 2017, 29(2): 133-137. https://doi.org/10.13883/j.issn1004-5929.201702001
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    We investigated the structural stability of KBrO3 by means of high-pressure Raman spectroscopy and angle-dispersive X-ray diffraction (AD-XRD). The Raman spectra of KBrO3 at pressures up to 30.9 GPa showed no changes besides monotonic shifts, suggesting no structural transformation occurred up to the highest pressure studied. The AD-XRD suggested the sample remained in its ambient pressure hexagonal phase. The bulk modulus was determined to be B0=25.9 (2) GPa with a pressure derivative  B’0= 5.68 (0.38). With the combination of Raman and AD-XRD, Grüneisen parameters of KBrO3 were also determined.
  • Raman Spectroscopy Characterization of Nanometer Level Flat Graphite Surface
    The Journal of Light Scattering. 2017, 29(2): 138-141. https://doi.org/10.13883/j.issn1004-5929.201702002
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    The atomically flat or nanometer level flat surface of graphite microstructure is an important foundation for studying the physical properties of the surface and interface and extremely important for the research and application of superlubricity and MEMS devices. In order to understand the state and properties of the surface of the graphite microstructure, it is of great significance to characterize non-destructively. The graphite microstructure was prepared by micromachining technology. Atomically flat or nanometer level flat graphite surfaces can be obtained by shearing the upper part of graphite mesa microstructure with a probe held by a manipulator. The surface of the graphite microstructure was characterized by Raman spectroscopy. By comparing with the results of atomic force microscopy, the results show that the Raman spectra can accurately reflect the degree of defects on the surface of graphite, and have the advantages of non-contact, non-destructive and fast. This shows that Raman spectroscopy can provide reliable characterization information in the characterization of the atomically flat graphite surface, and it can be used for rapid and nondestructive testing of samples, which lays the foundation for further research and application of graphite superlubricity and MEMS devices.
  • Dependent Scattering Influences on Photothermal Effect of Nanoparticulate Material
    The Journal of Light Scattering. 2017, 29(2): 142-148. https://doi.org/10.13883/j.issn1004-5929.201702009
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    This paper studies the light-induced heating and the temperature distribution of Au nanoparticulate material by using the finite element software COMSOL combined with the two-temperature model, where the effect of dependent scattering of Au nanoparticles is studied, and the transfer mode of energy in the composite medium in photothermal effect is also discussed. The results show that the two-temperature model and the Fourier heat conduction law can be combined together to describe the temperature changes of the nanoparticles and the surrounding medium; Compared with independent scattering particles, the photothermal effect is influenced by the coupling phenomenon between dependent scattering particles, and the interparticles coupling effect depends on their distance.
  • Raman Spectrum Analysis of Corrosion Products on the Bronze Earcup
    The Journal of Light Scattering. 2017, 29(2): 148-152. https://doi.org/10.13883/j.issn1004-5929.201702010
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    The corrosion products grown on the bronze earcup unearthed at Silibao site, Yunyang county, Chongqing were investigated by microscope and identified by Raman spectroscopy. The results are as follows: The corrosion products grown on the earcup are pyromorphite(lead phosphate chloride, Pb5(PO4)3Cl), cerussite(PbCO3), lead oxide(PbO), cuprite(Cu2O), malachite(Cu2CO3(OH)2) and azurite (Cu3(CO3)2(OH)2). And the corrosion products of lead from inner to outer are : lead oxide, cerussite and pyromorphite. It can be deduced through analysis that pyromorphite in the out layer of the patina was formed through the process Pb→PbO→PbCO3→Pb5(PO4)3Cl. Cerussite will transfer to pyromorphite when in the enviroment with ambient PH, higher phosphate levels and chloride.
  • The Study of Pigment Classification by Laser Raman Spectroscopy-Based on Cluster Analysis by Software R
    The Journal of Light Scattering. 2017, 29(2): 153-158. https://doi.org/10.13883/j.issn1004-5929.201702004
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    10 kinds of pigment were tested by laser Raman spectroscopy, write code tests based on the R software, according to the experiment resulting, set different parameters for data clustering analysis, thereby obtaining toner printed text classification. Using R software for analysis pigment printed text, is convenient and efficient than the traditional method. In practice, we can take a combination of both methods to improve efficiency.
  • Effects on Ozone Observation due to Aerosols in Nanjing
    The Journal of Light Scattering. 2017, 29(2): 159-166. https://doi.org/10.13883/j.issn1004-5929.201702016
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    This paper studies the effect of aerosol on the three-wavelength dual differential absorption lidar(Dual-DIAL)method with the presence of aerosols in Nanjing, the wavelength pair 266 nm,289 nm,308nm is used for errors analysis; based on the error analysis of the actual aerosol, the best value of C which minimizethe error isobtained as 1.7 ,and have been compared with thevalue derived by the traditional method; the influence of aerosol distribution and loading on the Care discussed , the variation of the errors with aerosol under different C is discussed, too. As the paper shows, 1.7 and 23/19 are two suitable values of C, since the aerosol distribution homogeneously, C=1.7 enable the error under 5% , but increases soon when the aerosol change frequently, maximally reach to 40%;the errorscan be stable when 23/19 as a value of C, errorsarenot greater than 10%, and the errors decreases with the height ;the value of C at different aerosol distribution is discussed.
  • Plane Wave Transmission Focusing Meta-Surface Structure Design#br#
    The Journal of Light Scattering. 2017, 29(2): 167-171. https://doi.org/10.13883/j.issn1004-5929.201702011
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    In order to realise the function of focusing by single flat lens, this paper proposed a electromagnetic focus meta-surface working on 10.6 μm wavelength which has one dimensional subwavelength grating structure. According to the resonance between dielectric nanostrcture and light, based on the coupled rectangular dielectirc resonators model, unit structure was designed. Using FDTD solution software for simulation, the function of phase modulation can be proved and 10 phase gradient structures can be selected. The meta-surface was designed by the free  combination of the 10 structures and tested by experiment. Result shows that, at 10.6 μm wavelength, when TM mode light incident the meta-surface, transmitted light will be focused, focal length is 49mm, the minimum value of the spot width is 0.7 mm, and working efficiency can be reached to 60 %.
  • Probe into the Technical Problems of the Optical Fiber Humidity Sensor Acquisition Calibration Equipment
    The Journal of Light Scattering. 2017, 29(2): 172-176. https://doi.org/10.13883/j.issn1004-5929.201702012
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    Humidity sensitive monitoring device with optical fiber coupling was developed in this paper. This device adopts the MEMS micro displacement sensor aided calibration for humidity sensitive micro-cavity coupling location, and the light intensity sensor is used for humidity output quantization. Comparing with other docking calibration platform, this kind of MEMS displacement sensor based coupling position calibration method needs not any huge instrument device, can obtain precise and convenient calibration results. In the sensor system back-end programmable control procedures can be developed, with the loading of data acquisition card to realize the humidity sensitive unit quantity acquisition and display.

  • Study on Near Infrared Spectrum of Natural Crystals and Synthetic Crystals by Hydrothermal Method
    The Journal of Light Scattering. 2017, 29(2): 177-180. https://doi.org/10.13883/j.issn1004-5929.201702013
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    Hydrothermal synthesis crystal and natural crystal has the same physical and chemical properties, rare inclusion. Conventional detection methods can’t identify. In this paper, using Infrared spectroscopy analysis, Synthesis of colorless and transparent crystals found in 3585 cm-1 band is characterized; Smoky crystals absorption peak at 3300~3000 cm-1 , and the synthetic smoky crystals is located at 3600-3300 cm-1; Synthetic citrine have 5200 cm-1 absorption peak, citrine doesn’t have this characteristic absorption; There are 5228 cm-1, 4450 cm-1 characteristic spectrum of amethyst, the synthesized  have characteristic absorption peak in the 4000~3000 cm-1; Synthetic green crystal is only 5200 cm-1 absorption peak.
  • Diagnosis of diseases of Apple Based on Fourier Transform Infrared Spectroscopy
    The Journal of Light Scattering. 2017, 29(2): 181-186. https://doi.org/10.13883/j.issn1004-5929.201702014
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    Fourier Transform Infrared Spectroscopy was used to identify healthy and four kinds of disease apple leave. The results show the spectra of apple leave are mainly composed of the absorption of cellulose, lignin, protein and aliphatic compound.  For the purpose of enhancing the spectral resolution, the first-derivative spectra and second-derivative spectra for all samples were taken by the software omnic8.5, and three spectra libraries were constructed.  The library Lib1 includes of the average spectra of each specimen, while Lib2 and Lib3 were constructed from the first-derivative spectra and second-derivative spectra of average spectra, separately. The expert search and absolute differential difference search of the spectra are performed with the library Lib1, and yield correct rate of 80% and 82.7%, respectively. The absolute differential difference search of the first-derivative spectra and second-derivative spectra was carried out with Lib2 and Lib3, and shows correct rate of 93.3% for the former and 82.7% for the later. The results show that the first-derivative spectra retrieval of absolute differential difference algorithm is more suitable for diagnosing disease of apple.
  • Spectral Characterization of 3C-SiC Film Grown on SOI Substrate
    The Journal of Light Scattering. 2017, 29(2): 187-190. https://doi.org/10.13883/j.issn1004-5929.201702015
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    This paper is to explore process conditions and technology of the reverse epitaxial growth of 3C-SiC thin film through the reaction of the top silicon of the substrate and carbon source. 3C-SiC film was grown on SOI substrate by Low Pressure Chemical Vapor Deposition (LPCVD) with CH4 and H2 gas mixture as reaction sources. Using various techniques, including x-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared (FTIR) reflectance to study the structure, properties and voltage capacitance characteristics of SOI and 3C-SiCOI samples. It’s found out that 3C-SiC film can be obtained through reverse epitaxial growth method and the current process conditions need to be further improved.
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