Optical chirality induced by spin–orbit interaction of light in a tightly focused Laguerre–Gaussian beam  

作　　者：朱明超 付圣贵 满忠胜 Mingchao Zhu;Shenggui Fu;Zhongsheng Man(School of Physics and Optoelectronic Engineering,Shandong University of Technology,Zibo 255000,China;Collaborative Innovation Center of Light Manipulations and Application,Shandong Normal University,Jinan 250358,China)

机构地区：[1]School of Physics and Optoelectronic Engineering,Shandong University of Technology,Zibo 255000,China [2]Collaborative Innovation Center of Light Manipulations and Application,Shandong Normal University,Jinan 250358,China

出　　处：《Chinese Physics B》2023年第11期419-425,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 12074224);the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2021YQ02 and ZR2020MA087)。

摘　　要：Optical chirality is one of the important and fundamental dynamic properties of light besides energy, momentum,and angular momentum. The quantification of electromagnetic chirality has been conceptualized only recently. Now, it is well known that for paraxial plane waves of light, the optical chirality is proportional to the ellipticity of the polarization ellipse, i.e., completely independent of the phase distribution. Here it is shown that optical vortex and state of polarization of the source paraxial field both have contributions to the optical chirality of the nonparaxial field generated by tightly focused Laguerre–Gaussian(LG) beam, which is in Stark contrast to the paraxial plane wave of light known from classical optics. The physical reason is the redistribution of local electromagnetic polarization in three dimensions associated with spin–orbit interaction.

关 键 词：tight focusing optical chirality spin-orbit interaction 

分 类 号：O431.1[机械工程—光学工程]