基于Mie散射理论的C@H_2O复合粒子散射特性研究
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摘要
大气中大量存在的复合粒子会对激光传输效率产生很大影响。由于空气中水蒸气含量较高,以C作为凝结核外层包裹以水的核壳结构微粒对光传输具有明显的散射效应。本文应用Mie散射理论对C@H_2O核壳结构微粒的散射特性进行了理论分析和数值计算,首先给出了不同入射波长、核粒子半径以及水膜厚度条件下散射强度分布变化曲线;其次给出了不同入射波长、核粒子半径以及水膜厚度条件下偏振变化情况;最后讨论了光学截面与粒子半径之间的关系。结果表明各参数对前向散射强度影响较大,入射波长越大散射强度越弱,C核半径增大粒子的前向散射增强,水膜厚度增大粒子的前向散射增强,而后向散射无明显影响;入射波长较大时,粒子在多个角度出现线偏振光,入射波长增大、碳核半径变大、水膜厚度增大,偏振度峰值都会增多;随着入射波长的增大,散射截面最大峰值位置向着半径增大的方向移动,并伴随一定的振荡现象,散射和消光截面在碳核半径为0.1μm左右达到最大值。
The theoretical analysis and numerical calculations of C@H_2O composite particle's light scattering characteristics were carried out by using Mie scattering theory. The distribution of scattering intensity and polarization with scattering angle under different parameters were both presented. The relationship between optical section and particle's radius was also given. The results showed that the forward scattering intensity was more greatly influenced by each parameters than that by the back-scattering. The larger wavelength is,the weaker the intensity is. The forward scattering increases with the C core radius and water film thickness while the back-scattering is substantially retained. As for the polarization,linear polarized light appears at various angles,the larger incident wavelength is,the bigger carbon nucleus radius is,the thicker water film thickness is,the more polarization peaks. The scattering cross section and extinction cross section posses a peak value when carbon nucleus radius is approximately 0.1 μm.
The theoretical analysis and numerical calculations of C@H_2O composite particle's light scattering characteristics were carried out by using Mie scattering theory. The distribution of scattering intensity and polarization with scattering angle under different parameters were both presented. The relationship between optical section and particle's radius was also given. The results showed that the forward scattering intensity was more greatly influenced by each parameters than that by the back-scattering. The larger wavelength is,the weaker the intensity is. The forward scattering increases with the C core radius and water film thickness while the back-scattering is substantially retained. As for the polarization,linear polarized light appears at various angles,the larger incident wavelength is,the bigger carbon nucleus radius is,the thicker water film thickness is,the more polarization peaks. The scattering cross section and extinction cross section posses a peak value when carbon nucleus radius is approximately 0.1 μm.
引文
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[3] 范新坤,张磊,佟首峰,等. 天空背景光对空间激光通信系统的影响 [J]. 激光与光电子学进展, 2017,54(7):070601. FAN X K,ZHANG L,TONG S F,et al.. Influence of sky background light on space laser communication system [J]. Laser Optoelectron. Prog., 2017,54(7):070601. (in Chinese)
[4] 冯涛,陈刚,方祖捷. 非视线光散射通信的大气传输模型 [J]. 中国激光, 2006,33(11):1522-1526. FENG T,CHEN G,FANG Z J. Atmospheric propagation model in non-line-of-sight optical scattering communication [J]. Chin. J. Lasers, 2006,33(11):1522-1526. (in Chinese)
[5] CHANG S L,YANG J K,YANG J C,et al.. The experimental research of UV communication [C]. Proceedings of SPIE 5284,Wireless Communications and Networks,Wuhan, 2004:1621-31.
[6] VAN WALREE P A. Propagation and scattering effects in underwater acoustic communication channels [J]. IEEE J. Oceanic Eng., 2013,38(4):614-631.
[7] CHO S,SHIM T S,KIM J H,et al.. Selective coloration of melanin nanospheres through resonant Mie scattering [J]. Adv. Mater., 2017,29(22):1700256.
[8] YUAN W,ZHOU N,SHI L,et al.. Structural coloration of colloidal fiber by photonic band gap and resonant Mie scattering [J]. ACS Appl. Mater. Interfaces, 2015,7(25):14064-14071.
[9] MISHCHENKO M I,YANG P.Far-field Lorenz-Mie scattering in an absorbing host medium:theoretical formalism and FORTRAN program [J]. J. Quant. Spectrosc. Radiat. Transfer, 2018,205:241-252.
[10] 徐庆君,庄申栋. 基于Mie散射理论对砷化镓光子晶体安德森定域化研究 [J]. 强激光与粒子束, 2011,23(10):2613-2616. XU Q J,ZHUANG S D. Study on Anderson localization of photonic crystal of GaAs based on Mie scattering theory [J]. High Power Laser Part. Beams, 2011,23(10):2613-2616. (in Chinese)
[11] 徐庆君,韦德泉,田贵才. 基于Mie散射理论的铌酸锂晶粒散射特性 [J]. 发光学报, 2009,30(6):867-871. XU Q J,WEI D Q,TIAN G C.The scattering characteristics of LiNbO3 particle based on Mie light scattering theory [J]. Chin. J. Lumin., 2009,30(6):867-871. (in Chinese)
[12] 徐庆君,田贵才. 基于Mie散射理论的反蛋白石光子晶体定域化研究 [J]. 量子电子学报, 2009,26(6):698-702. XU Q J,TIAN G C. Localization of reverse opal photonic crystal based on Mie light scattering theory [J]. Chin. J. Quantum Electron., 2009,26(6):698-702. (in Chinese)
[13] 吴良海,高隽,范之国,等. 大气粒子散射特性及其对空间偏振分布的影响 [J]. 光学学报, 2011,31(7):0701005. WU L H,GAO J,FAN Z G,et al.. Scattering of particles in the atmosphere and their influence on celestial polarization patterns [J]. Acta Opt. Sinica, 2011,31(7):0701005. (in Chinese)
[14] VAN D E,HULST H C. Review of publications- light scattering by small particles [J]. J. R. Astron. Soc. Can., 1960,54(5):89.
[15] 王蓉蓉,吴振森,张艳艳,等. 太赫兹波在雾中的多重散射特性 [J]. 强激光与粒子束, 2014,26(11):153-159. WANG R R,WU Z S,ZHANG Y Y,et al.. Multiple scattering characteristics of THz wave in fog [J]. High Power Laser Part. Beams, 2014,26(11):153-159. (in Chinese)
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