共振散射对微球颗粒光子喷射流的影响  

Effect of Resonant Scattering on Photonic Jet of a Microsphere

作　　者：刘潜 沈建琪[1] LIU Qian;SHEN Jianqi(College of Science,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学理学院,上海200093

出　　处：《光子学报》2021年第7期182-194,共13页Acta Photonica Sinica

基　　金：国家科技重大专项(No.2017-V-0016-0069)。

摘　　要：研究了光子喷射流特征参数与颗粒物性参数之间的关系,包括不同偏振模式共振和非共振散射条件下光子喷射流的物理机理。通过理论计算,数值分析了非共振情况下光子喷射流特征参数与折射率和颗粒粒径的关系;研究了共振散射对光子喷射流特征的影响,分析了共振散射分波在其中的作用;比较了线偏振和圆偏振入射光照射下光子喷射流的差异。研究表明:共振散射对光子喷射流的影响主要体现在焦点宽度减小、焦点向颗粒表面内移、光子喷射流长度缩短、焦点处强度增大以及场分布更加复杂;TE和TM共振下电场径向和横向分量的相对强度存在差异;入射光偏振态仅影响电场的横向分布。通过控制入射光和颗粒参数,调制光子喷射流的特征参数及场分布特征,可为光子喷射流在不同场合的应用提供理论依据。The relationship between the characteristic parameters of photon jet and those of particles is studied,including the mechanism in the generation of photon jet under different polarization modes of resonant and non-resonant scattering.The dependence of the photonic jet characteristic parameters on the refractive index and particle parameters is numerically analyzed with the Lorenz-Mie theory calculation.The effect of resonant scattering on the photonic jet is studied,showing the contribution from the resonant partial wave.Besides,a comparison is made for the photonic jets in linearly-and circularly-polarized irradiations.The results show that resonant scattering affects the photonic jet by narrowing its transverse width,shifting the focus inward to the particle surface,shortening the longitudinal length,enhancing the intensity at the focus and making the field distribution more complex.The relative intensity of the radial and transverse components of the electric field is different under TE and TM resonances.The polarization state of the incident light affects the transverse distribution of the photonic jet only.By controlling the parameters of incident light and particles,the characteristic parameters and the field distribution of the photonic jet can be modulated.The study provides theoretical reference for the applications of photonic jet.

关 键 词：光散射 光子喷射流 Lorenz-Mie理论 共振散射 微球 

分 类 号：O436.2[机械工程—光学工程]