10 September 2019, Volume 31 Issue 3
    

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    Overview
  • Raman Laser,Light’s Quantum Spin Hall effect
    CHENG Guangxu
    Chinese Journal of Light Scattering. 2019, 31(3): 199-214. https://doi.org/10.13883/j.issn1004-5929.201903001
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Raman Laser is the outcome,which was extracted from the scattered light for the process of Raman scattering,i.e.“3,2,and 1”-three levels,double photons and one elementary excitation,corresponding scattered photon for one of double photons; obvious,the “extraction” is key for this process,there are detailed expounded,i.e.physical course,structures of the things and their material,or other a series of problems,are presented,in this paper.Moreover,there are minutes set forth for the light's quantum spin Hall effect,including the physical principles,experimental installations,new results and developing trend,also too.Finally,the opaque material of “light” is discussed,objectively.
  • Research Progress on the Preparation of Chiral Plasmonic Nanocrystals
    ZHENG Guangchao, XIE Juan, WANG Shenli, LIANG Erjun
    Chinese Journal of Light Scattering. 2019, 31(3): 215-227. https://doi.org/10.13883/j.issn1004-5929.201903002
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    Most of the biomolecules in living organisms are chiral.The chiral conformation of biomolecules can be transferred to plasmonic nanocrystals via coupling with its localized surface plasmon resonance (LSPR),inducing a new circular dichroic peak at the LSPR position of plasmonic nanocrystals.In this review,chiral plasmonic nanocrystal is defined as they can possess the chiroptical activity.Because of its high stability and reproducible chiroptical response signal,chiral plasmonic nanocrystals have attracted great attention from basic science to applications.So far,synthesis of chiral plasmonic nanocrystals have always been hot topic in the numerous fields,such as,bio-/chemical sensing,circular polarizers,photocatalysis,cancer treatment,etc.In this review,chiral molecules on the surface of plasmonic nanocrystals inducing chiroptical response are not discussed because their weak coupling strength leads to weak chiroptical activity.We will focus on the recent fabrication technologies of chiral plasmonic nanocrystals,including (i) self-assembly of achiral plasmonic nanocrystals by chiral molecules or soft templates; (ii) chiral molecules encapsulation into a single nanocrystal is to make core-shell chiral plasmonic nanocrystal; (iii) chiral conformation of chiral molecules transferring to the structure of plasmonic nanocrystals is to fabricate a single helical chiral plasmonic nanocrystal.Finally,we have summarized and prospected the synthetic nanotechnology of chiral plasmonic nanocrystals based on the recent research achievements.
    • Surface Enhanced Raman Scattering（SERS）
  • Rapid Detection of Different Types of Flavors in Cigarette Production Using Surface-Enhanced Raman Spectroscopy
    GAO Yang, LIN Jiasheng, XU Qingquan, ZHANG Lina, WANG Hui, WEN Baoying, LI Jianfeng
    Chinese Journal of Light Scattering. 2019, 31(3): 228-234. https://doi.org/10.13883/j.issn1004-5929.201903003
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The formula of flavors is the core technology in the cigarette industry.Adding flavors to the cigarette during cigarette production can significantly improve the quality of the cigarette.However,traditional techniques used to identify the types of flavors in cigarettes are mainly through artificial smell and determination of certain physical properties such as refractive index,relative density,acid value,total volatiles,and chromatography-mass spectrometry.These techniques have many drawbacks,such as subjectiveness,complicated operation,time-consuming pretreatment,high cost,and low sensitivity.Based on this,this paper developed a method for rapidly identifying different types of tobacco flavors in production by surface-enhanced Raman spectroscopy with the assistance of principal component analysis.In this paper,the enhanced Raman spectra of different types,different batches,and different flavor additives were obtained.Principal component analysis showed that the scatter points of different types and different blending samples were distributed in different regions,while different batches of the same kind were concentrated in the scatter plot,which facilitating the differentiation.In this paper,surface-enhanced Raman spectroscopy with the assistance of the principal component analysis algorithm for the detection of tobacco flavors is simple,rapid,low-cost,and easy to analyze and identify.It is suitable for the quality control of tobacco flavors in the actual production.
    • Applications in Chemistry and Biology Researches
  • Raman Spectroscopy study of cubic Polymeric nitrogen (cg-N) at High pressure and low temperature
    LIU Shan, PU Meifang, ZHANG Feng, LEI Li
    Chinese Journal of Light Scattering. 2019, 31(3): 235-240. https://doi.org/10.13883/j.issn1004-5929.201903004
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    Polymeric nitrogen is an ideal high energy density material.In this work,molecular nitrogen was compressed to 136 GPa at room temperature,and a three-dimensional network of cubic polymeric nitrogen cg-N bonded by a covalent N-N single bond was successfully synthesized by laser heating to 2000 K.The vibrational properties of cg-N lattices were studied by the temperature-dependence on Raman spectra between 173 K to 300 K using a self-designed high-pressure cryogenic device.It was observed that the A-mode phonons of cg-N had different responses to temperature at different pressures.With the temperature decreasing,the blue-shift and temperature-dependence Raman spectra of the A-mode frequency could be well fitted using a model involing multi-phonon decay processes.Our fitting indicated that the three-phonon decay processes were dominated over the four-phonon ones at low temperatures.The three-phonon decay processes at 133 GPa dominated less than it at 140 GPa,while the four-phonon decay processes at 133 GPa dominated more than it at 140 GPa.
  • Study on Rapid Detection of Illegal Dye in Cinnabar with Paper-Based SERS Substrate
    LI Nan, HAN Siqingaowa, ZHAO Hang, SHA Xuanyu, HASI Wuliji
    Chinese Journal of Light Scattering. 2019, 31(3): 241-247. https://doi.org/10.13883/j.issn1004-5929.201903005
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    Surface-enhanced Raman spectroscopy (SERS) technology was performed by employing a paper-based SERS substrates for rapid detection of Scarlet 808 (S808),an illegal dye in cinnabar.The theoretical Raman spectrum of S808 was calculated and characteristic peaks of S808 were assigned to the corresponding vibrational modes by density functional theory.For preparing the paper-based SERS substrate,the liquid-liquid interface self-assembly technology was used to assemble the silver nanoparticle on the filter paper.The substrate showed good reproducibility in the test.S808 on cinnabar was detected by paper-based SERS substrates,obtaining the minimum detection limit of 0.05 μg/mL.In addition,under the concentration ranging from 0.05 to 1 μg/mL,the Raman intensity of S808 SERS spectrum with its concentrations of S808 in cinnabar displayed a linear relation,with the coefficient of R2=0.98673.Therefore,the paper-based SERS substrates can be applied into on-site detection of the illegal dye in cinnabar in an easy and rapid manner.
  • Raman Spectra Calculation and Analysis of Acetohlor
    FENG Aoran, JIA Qiang, TAN Yong
    Chinese Journal of Light Scattering. 2019, 31(3): 248-254. https://doi.org/10.13883/j.issn1004-5929.201903006
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    Acetochlor is one of the most used herbicides in China.Its metabolites and itself both have potential harm to the human body.It can be distinguished from plants by identifying its vibration information.In this article,the structure of acetochlor was optimized and its Raman spectrum was calculated with the three-parameter hybrid functional B3LYP of the density functional theory(DFT) and the Hartree-Fock(HF) algorithm respectively both based on the 6-311G++ (d,p) level to obtain the vibration information in theory.As is shown in the calculation results,the peak positions calculated are slightly different for the different methods.The Raman spectrum of the analytical reagent of acetochlor was collected by the three-stage grating confocal micro-Raman spectrometer-TriVista 555CRS produced by PI company in experiment.The experimental Raman spectrum is seriously interfered by the fluorescence peaks,which makes the difference of linear type between the experimental result and the theoretical calculation result.For this problem,we have the experimental Raman spectrum defluorinated.And for the error of the theoretical result in frequency,the correction factors are used to correct the two methods.After the above steps,it was shown that the experimental result were basically consistent with the theoretical calculation result,that the vibrational spectra of the 500~3300 cm-1 interval were assigned.The work of this paper provides a theoretical basis for the residue detection of acetochlor.
  • Study on Ultraviolet Aging of Five Mineral Pigments in Chinese Painting
    LIU Min, LV Xiaofang, TANG Ming, CHENG Xiaolin
    Chinese Journal of Light Scattering. 2019, 31(3): 255-259. https://doi.org/10.13883/j.issn1004-5929.201903007
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    In this study,the samples of five mineral pigments of Chinese painting,namely azurite,malachite,cinnabar,orpiment and realgar on the simulated ancient painting carrier were subjected to ultraviolet light aging.Color differences of the samples before and after aging were analyzed.The samples were observed by video microscope and detected by invia Raman spectrometer.The results showed that the chromatic aberration of realgar rapidly changed after aging for 271 hours,with which the value of chromatic aberration reached more than 25.The realgar sample showed discoloration.This indicated that the realgar had poor stability under ultraviolet irradiation.Raman spectra found that after being irradiated by ultraviolet light,the realgar gradually changed into pararealgar,which caused discoloration.Other mineral pigment samples including azurite,malachite,cinnabar and orpiment had little change during the aging process.Their Raman spectra before and after aging also did not show significant changes.
  • Study on Quantitative Measurement Methods of Biological Organization Based on Raman Spectroscopy
    ZHU Yongkang, LU Yanfei, SHANG Linwei, ZHAO Yuan, JIANG Chongyu, XU Hao, YIN Jianhua
    Chinese Journal of Light Scattering. 2019, 31(3): 260-265. https://doi.org/10.13883/j.issn1004-5929.201903008
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    The Raman intensity of different biological samples or slices at the same wavenumber would be probably different when repeatedly detected at the same location,which was due to fine variation of focused position and the system deviation and made quantitative analysis much hard.Consequently,it was necessary to get a more feasible approach of defining internal or external standard for quantitative detection,which would be helpful for comparing Raman spectra captured under different conditions directly.Under the condition of polarization and depolarization,the Raman spectra of canine hip articular cartilage slices were detected and processed by standard normal variate (SNV) and multi-scattering correction (MSC) methods.In addition,eosin used as a novel internal standard to preprocess Raman signal was discussed and explored.It was found that the MSC method was most suited for the depolarization condition,as well as 1501 cm-1 band of eosin as internal standard for the polarization condition.The Raman band of eosin didn′t show anisotropy with polarization angel,which was effective to use as internal standard for the normalization of Raman spectra of biological tissue.Further,the internal standard method based on eosin brought more simple operation and more accurate results than MSC and SNV.Therefore,this study provided a promising novel method for the quantitative analysis of biological samples based on Raman spectroscopy.
  • Preparation and SERS Activity of Silver Thin Film on Butterfly Wings
    LI Ling, YIN Zhengyuan, DUAN Junli, XIAO Guina
    Chinese Journal of Light Scattering. 2019, 31(3): 266-270. https://doi.org/10.13883/j.issn1004-5929.201903009
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    On the commercial butterfly wings,silver/butterfly wings substrates were prepared by depositing silver thin film with vacuum thermal evaporation method.The microstructure and surface morphology of silver/butterfly wings were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM).Rhodamine 6G(R6G) was chosen as the probing molecule,the surface-enhanced Raman scattering (SERS) activities of silver thin film on different butterfly wings were investigated.The effects of R6G aqueous solution concentrations and silver thin film thicknesses on SERS performances of the substrates were semi-quantitatively analyzed.In addition,twelve locations were randomly selected on the substrates of Kallima Inachus and Gypsy moth.The relative standard deviation values of the peak intensities of 604,1349 and 1509 cm-1were 5.30%,6.86%,5.58% and 4.36%,3.21%,3.35%,respectively,which indicated the prepared Ag/butterfly wings exhibited good uniformity.
    • Other Optical Spectroscopic Techniques and Applications
  • Study of Carrier Transport Mechanism in poly(3-hexylthiophene) (P3HT) by Photoelectric Time-of-Flight Method
    GONG Qianxun, ZHANG Sijie, Maureen A.C.Willis
    Chinese Journal of Light Scattering. 2019, 31(3): 271-275. https://doi.org/10.13883/j.issn1004-5929.201903010
    Abstract ( ) Download PDF ( ) Knowledge map Save
    We measured the carrier transit time of ITO/P3HT(poly(3-hexylthiophene))/Al devices by using the photocurrent time-of-flight method which the P3HT films were drop-casting from its chloroform solution,the data range of the mobility was relatively large.The hole mobilities of P3HT were regularly divided into three groups by the analysis of Poole-Frenkel plot.It can be inferred that there are at least 3 different carrier transport mechanisms in poly(3-hexylthiophene).
  • Optical Forces on a Microsphere in the Highly Focused Laguerre-Gaussian Beam
    ZHANG Nao, ZHANG Bo, LIU Zilong, LIU Yaxin
    Chinese Journal of Light Scattering. 2019, 31(3): 276-281. https://doi.org/10.13883/j.issn1004-5929.201903011
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    Laguerre-Gaussian beams are typical vortex beams,the orbital angular momentum of the beam can be transmitted to the microsphere and make it do an orbital motion.The trapping forces exerted by the highly focused linearly polarized Laguerre-Gaussian beam (LGB) on a spherical particle are calculated by means of the T-matrix method and Maxwell stress tensor integral.The impact of microsphere radius and beam order on the particle′s trapping states in the vortex focusing field are investigated.When the topological charge keeps constant,with the microsphere′s radius increases,the trajectory of the orbital motion will gradually shrink.As its radius is larger than the critical value,the microsphere will be trapped on the optical axis without orbital motion.However,axial trapping forces of particles trapped off-axis are smaller an order of magnitude than those of particles trapped on axis,so that more input optical power is needed to maintain the stable orbital motion.
  • Tunable Band Gap of Lepidocrocite-TiO2 and GaSe 2D Crystals via Biaxial Stress
    ZHAO Yilin, ZHANG Hong
    Chinese Journal of Light Scattering. 2019, 31(3): 282-290. https://doi.org/10.13883/j.issn1004-5929.201903012
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    In this paper,a physical model of lepidocrocite-TiO2 and GaSe 2D crystals are established.The calculation of the band structure,density of states and optical spectrums of these crystals are performed with the first-principles density functional theory(DFT).The influence of the biaxial stress to the band structure and optical response of the 2D crystals are calculated.The results show that the band gap can be tuned systematically via the biaxial stress.There is a.This study paves the path for these 2D crystals′ further application in tunable electronic devices and photovoltaic devices.
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