31 March 2017, Volume 29 Issue 1
    

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  • Fano Resonances in Plasmonic Nanostructures and Its Applications
    The Journal of Light Scattering. 2017, 29(1): 1-7. https://doi.org/10.13883/j.issn1004-5929.201701007
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    Fano resonance is a resonance scattering phenomenon with an asymmetric spectral line shape, which originated from the quantum interference between resonant and non-resonant paths. Recently, Fano resonance in plasmonic nanostructures has been observed and developed to a research hotspot in nanophotonics. Plasmonic Fano resonance usually exhibits a narrow spectral line width, and cannot be excited by incident light and localizes at near field regions with a large electromagnetic field congregation and enhancement. Due to its special optical properties, Fano resonance has wide and significant applications in the areas such as single-molecule detection, high sensitivity sensing, enhanced spectrum, perfect absorption,  electromagnetically induced transparency and slow-light photonic devices.
  • Investigation of Identification of Organic Components in Ancient Relics by Raman Spectroscopy
    The Journal of Light Scattering. 2017, 29(1): 8-15. https://doi.org/10.13883/j.issn1004-5929.201701006
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    Raman spectroscopy can offer useful information on structures of materials as fingerprint spectra. It has already been widely used in composition identification of artefacts in archaeology and conservation because of the advantages of simple operation, non-invasive and micro-area detection. In this article, the application of Raman spectroscopy in analyzing organic dyes, binding media and organic residues of the artworks was systematically illustrated. Additionally, the bright application prospect of this technique in organic identification of cultural relics was highlighted. Developing trend was pointed out as well.
  • Orientation-Averaged Optical Properties of Nonspherical Dust Aerosols
    The Journal of Light Scattering. 2017, 29(1): 16-22. https://doi.org/10.13883/j.issn1004-5929.201701008
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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 the asphericity degree on aerosol optical properties and whether properties of orientation-averaged nonspherical particles can be replaced by those of effective isovolumetric spherical particles are also studied. For monodisperse and polydisperse spheroid dust, distinctive asphericity can generally induce distinctive deviations from their effective isovolumetric spherical particles for extinction efficiency factor, asymmetry parameter and single scattering albedo. For the same asphericity, the deviations of asymmetry parameter of nonspherical particles from their isovolumetric spheres are larger than those of extinction efficiency factor and single scattering albedo. Optical properties of orientation-averaged nonspherical particles cannot be rigorously replaced by those of their effective isovolumetric spheres. Orientation-averaged extinction efficiency factors, asymmetry parameters and single scattering albedos of nonspherical aerosols can be approximately replaced by those of their effective isovolumetric spheres, if the asphericity is small. However, for large asphericity, the approximate replacement happens only for the single scattering albedo with its deviation within 3% for spheroid dust at aspect ratio of 16 as an example.
  • Numerical Simulation of Optical Limiting Properties of Carbon Nanoparticle Suspension
    The Journal of Light Scattering. 2017, 29(1): 23-27. https://doi.org/10.13883/j.issn1004-5929.201701009
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    Carbon nanoparticle suspension has a good optical limiting properties, which is an excellent broadband optical limiting material. The relationship between micro-bubble radius and the incident light energy, theoretical mode of carbon nanoparticles suspension scattering coefficient and transmission ratio are established by heat conduction equations and Mie scattering theory. The variation of the scattering coefficient with the micro bubble size factor and optical limiting properties’ change law with the incident light energy’s change are simulated by matlab. The effects of bubble size factor, incident laser energy and wavelength on the optical limiting properties of carbon nanoparticles are investigated. It shows that when the laser energy reaches a certain value, the radius of the micro bubbles is kept constant, and no longer increases with the increase of the laser energy. The increase of micro bubble size has a significant effect on the transmittance of the suspensions of carbon nanoparticles. Meanwhile, carbon nanoparticle suspension has different optical limiting properties for different incident light wavelengths and light energy. The research results provide theoretical guidance for the experimental study.
  • Synthesis and Optical Performance of Magnetically Controlled Fe3O4@PS Colloidal Photonic Crystals
    The Journal of Light Scattering. 2017, 29(1): 28-32. https://doi.org/10.13883/j.issn1004-5929.201701010
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    In this paper, Fe3O4 nano-particles modified by oleic acid were synthesized through coprecipitation method. The Fe3O4 nano-particles were dispersed into Octane to form magnetofluid. Then, Fe3O4@PS microspheres were prepared using one step miniemulsion polymerization method. SEM results showed that the particle size of Fe3O4 nano-particles is about 13 nm and the diameter ofFe3O4@PS microspheres is 120~150 nm or so. The magnetic measurement results showed that as-prepared Fe3O4@PS microspheres possess superparamagnetism and the saturation magnetization Ms is about 25 emu/g. The surface of Fe3O4@PS microspheres is negatively charged and the Zeta potentialis －60 mV. Reflectance spectrum measurement results showed that the colloidal suspension of Fe3O4@PS in aqueous solution exhibits bright structural color and obvious band-gap features under magnetic fields. With the increase of magnetic field strength, reflectance peaks wavelength can be modulated in the range 450 ~ 650 nm.
  • Temperature Dependence on Raman Spectra and High-pressure Synchrotron Radiation Study of Re3N
    The Journal of Light Scattering. 2017, 29(1): 33-38. https://doi.org/10.13883/j.issn1004-5929.201701001
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    Well-crystallized bulk of Re3N was synthesized through a High-Pressure Solid-State Metathesis (HPSSM) reaction. The structural characterizations and compositions of as-prepared samples were determined by X-ray powder diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDS), which indicated high crystalline quality of Re3N. The vibrational properties of Re3N lattices were studied by the temperature dependence on Raman spectroscopy between 77 K and 873 K. With the temperature increasing, the red-shift and broadening of Raman bands of Re3N could be well fitted using a model involving three- and four-phonon decay processes. Our fitting results indicated that the three-phonon decay processes were dominant over the four-phonon ones at high temperatures. The bulk modulus B0=417 GPa for Re3N was determined by high-pressure synchrotron radiation research indicating that Re3N synthesized through HPSSM reaction may be a potential superhard materials.
  • Raman Spectroscopic Analysis of Wall Painting Pigments at Jokhang Temple, Lhasa, Tibet, China
    The Journal of Light Scattering. 2017, 29(1): 39-43. https://doi.org/10.13883/j.issn1004-5929.201701011
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    Raman microscopy was applied to analyze pigments samples were collected from murals on the pilgrimage-corridor walls at Jokhang Temple,Lhasa,Tibet,China. The results show that red pigments are cinnabar, red lead and toluidine red,yellow pigments are orpiment, lead chrome yellow and iron (III) oxide monohydrate, blue pigments are azurite and ultramarine blue, green pigments are malachite, brochantite and emerald green, write pigments are magnesite, ithopone and calcite. Synthetic organic pigments(Toluidine Red )was founded firse time. The investigation can provide accurate and reliable information for the clear understanding different historical periods mural painting and restoration pigments.
  • Research on Dating of Inkpad Seals by Micro-Raman Spectroscopy
    The Journal of Light Scattering. 2017, 29(1): 44-49. https://doi.org/10.13883/j.issn1004-5929.201701002
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    Objective taking advantage of Micro-Raman spectroscopy technology , samples of inkpad seals were impressed with 10 different brands of inks. To analysis the factors of paper，temperature and heat condition by relative area value（I）of characteristic peaks with 1089 cm-1 and 1235 cm-1 in Raman spectrum, in order to discuss the relation between relative area value （I） and dating of inkpad seals. The relative area value (I) showed a regular change with time, especially the stamp of impression in the near time . Micro-Raman spectroscop is a useful method  with accurate, non-destructive properties to determine the formation time of inkpad seals.
  • Study on Raman Spectrum of Natural Crystal and Synthetic Crystal by Hydrothermal Method
    The Journal of Light Scattering. 2017, 29(1): 50-53. https://doi.org/10.13883/j.issn1004-5929.201701003
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    Synthetic crystal by hydrothermal method is based on the physical and chemical properties of natural crystal which can simulate the formation environment, conventional detection methods can’t be identified. This paper used the laser Raman spectrometer of French Olympus BX41 to test, the natural crystal and synthetic crystal of Raman spectrum 466 cm-1 spectra were fitted by linear Gaussian fitting, it found that the FWHM of nature crystal were more than 6.5 cm-1, the FWHM of synthetic crystal were less than 6.5 cm-1.The Differences of Raman FWHM can provide the information to identify the natural crystal and synthetic crystal by hydrothermal method.
  • Aerosol Optical Properties in Nanjing Area with Raman Scattering
    The Journal of Light Scattering. 2017, 29(1): 54-61. https://doi.org/10.13883/j.issn1004-5929.201701012
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    Analysis of the optical characteristics of aerosol in Nanjing by using the data from the Raman channel of Rayleigh-Raman-Mie Lidar, which belong to the Comprehensive Observation Base of China Meteorological Administration, is presented in this paper. In the inversion calculation of extinction coefficient, Raman signal fluctuates greatly, which causing the extinction coefficient value to fluctuate within the range of －0.1~0.4 km-1, and bring great difficulties in inversion results. After repeated inversion calculation .We found wavelet denoising can solve this problem, and the inversion results with the same instrument at the same time from different channels (Mie channel) inversion results were compared. The extinction coefficient value of there are both about 0.05 km-1 in March 30, 2011, and the trends of the results are consistent . The results show that the wavelet denoising can improve the inversion calculation accuracy of the aerosol optical properties.
  • Raman Spectroscopic Study of the Chain Silicate Minerals
    The Journal of Light Scattering. 2017, 29(1): 62-69. https://doi.org/10.13883/j.issn1004-5929.201701013
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    Ambient temperature Raman spectra of four typical chain silicate mineral crystals were determined and the vibrational modes have also been simulated through Cambridge Serial Total Energy Package(CASTEP) function based on density functional theory (DFT). Analysis of the various vibrational modes combined with SIT (stress index of tetrahedron), which expresses the characteristics of the microstructure of alumina silicates.The results show that the CASTEP calculation is an effective and practical calculation method to simulate Raman spectra of the aluminasilicates, and help to assign the vibrational modes. The concept of SIT also has its application on studying the correlation between Si-Onb symmetric stretching vibration and the minerals local environment of SiOT.
  • An in Situ Simple Device Dedicated in SAXS for Sample Heating
    The Journal of Light Scattering. 2017, 29(1): 70-73. https://doi.org/10.13883/j.issn1004-5929.201701014
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    In situ heating experiments are a new hot spot in synchrotron radiation small angle X-ray scattering (SAXS) field. A simple synchrotron radiation SAXS in situ special device for sample heating is reported herein, recently designed by author, mainly containing thermostat, the sample cell, holder. The feature of the device is simple structure and easy operation. This article mainly describes the basic structure of the device, characteristics of the device and uses the device operate an in situ heating and drying experiment of lignite, then analyzes experimental results verifying the feasibility of the device.
  • Measurements of Near-Ground Atmospheric Side-Scattering Coefficient Profile Based on CCD Device
    The Journal of Light Scattering. 2017, 29(1): 74-78. https://doi.org/10.13883/j.issn1004-5929.201701015
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    A device which can illustrate the side-scattering coefficient profile of atmosphere was established in this paper. Based on charge coupled device(CCD), the device inversed the coefficient profile by measuring the side-scattering intensity with the scattering angle ranges from 33° to 145°. By projecting the collected side-scattering light to a plane, we realized the correspondence between the CCD pixels and scattering angle, and inversed the side-scattering coefficient profile at last. The device also upgraded the real-time performance by adopting CW green laser source and CCD with high frame rate.
  • Study on the Identification of Standard and False Panax notoginseng by Two-Dimensional Infrared Correlation Spectroscopy
    The Journal of Light Scattering. 2017, 29(1): 79-84. https://doi.org/10.13883/j.issn1004-5929.201701016
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    Standard Panax notoginseng and its counterfeit Curcuma longa, Atractylodes macrocephala were identified fast and nondestructively by Fourier Transform Infrared
    Spectroscopy (FTIR) combined with two-dimensional correlation spectroscopy (2D-IR). Compared with conventional IR spectra of the samples, some certain differences were found in the characteristic peaks of flavonoids, aromatics and glycosides. In the range of 1 200-700 cm-1, it’s easy to find the fingerprint characteristic peaks of starch in the infrared spectra of Panax notoginseng and Curcuma longa, but Atractylodes macrocephala not. According to the relative intensity of starch characteristic peaks in the samples , it’s easy to find that the contents of starch in Panax notoginseng are higher than those in Curcuma longa, and Atractylodes macrocephala doesn’t contain starch. In the 2D-IR correlation spectra, the samples presented the differences in the position, number and relative intensity of autopeaks and correlation peak cluters. Consequently, Fourier Transform Infrared Spectroscopy (FTIR) combined with two-dimensional correlation spectroscopy (2D-IR) can be used to identified Panax notoginseng and its counterfeit Curcuma longa, Atractylodes macrocephala.

  • The Study of Toner Thickness on Laser Printing Paper Based on Laser Scanning Confocal Microscope
    The Journal of Light Scattering. 2017, 29(1): 85-91. https://doi.org/10.13883/j.issn1004-5929.201701004
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     The toner thickness on printing paper, which is printed by six laser printers with printing paper and photographic paper, was measured by laser scanning confocal microscope. The results show that the toner thickness data are fluctuated because of the rough surface of printing paper, whereas the date of photographic paper are more stable. Also the relationship of stroke width and toner thickness are obtained. This research provides a practicability for measuring toner thickness with laser scanning confocal microscope. As an effective factor, toner thickness can offer quantitive evidence for printing document examination and identity the printer combined with other examining method.
  • Luminescence Properties of Li+、Na+ Doped Gd2O3: Eu3+ Phosphor Prepared by Precipitation Methods
    The Journal of Light Scattering. 2017, 29(1): 92-96. https://doi.org/10.13883/j.issn1004-5929.201701005
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    The Gd2O3: Eu3+ phosphor co-doped with Li+ and Na+ were prepared by precipitation method and compared with the samples prepared by microwave solid state phase method. The X ray diffraction, the excitation spectra and the emission spectra of the samples were measured. The microstructure of the samples was analyzed, and the effect of different synthesis conditions on the photoluminescence properties of Gd2O3: Eu3+ phosphor was discussed. The results showed that without adding Li+ ions, the luminous intensity of the sample obtained by precipition increased about 1.68 times compared with the sample prepared by the microwave solid phase method. Adding Li+ ions, the luminous intensity of the sample obtained by precipition increased 1.82 times compared with it obtained by the microwave solid phase method. The emission of the sample with 4.5 mol% Li+,4.5 mol% Na+  and 4.5 mol% Eu3+  co-doped Gd2O3 increased 5.91 times than that of the sample without adding Li+ and Na+ ions by C2H2O4 precipitation.
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