Optical spiral vortex from azimuthally increasing/decreasing exponential phase gradients  

作　　者：介珮桦 谢振威 袁小聪 Peihua Jie;Zhenwei Xie;Xiaocong Yuan(Nanophotonics Research Centre,Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous Integration,Shenzhen University,Shenzhen 518060,China;Research Center for Humanoid Sensing,Zhejiang Laboratory,Hangzhou 311100,China)

机构地区：[1]Nanophotonics Research Centre,Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous Integration,Shenzhen University,Shenzhen 518060,China [2]Research Center for Humanoid Sensing,Zhejiang Laboratory,Hangzhou 311100,China

出　　处：《Chinese Optics Letters》2023年第11期123-127,共5页中国光学快报（英文版）

基　　金：supported by the Guangdong Major Project of Basic and Applied Basic Research(No.2020B0301030009);National Natural Science Foundation of China(Nos.61935013,62375181,and 61975133);Science and Technology Innovation Commission of Shenzhen,Shenzhen Peacock Plan(Nos.KQTD20170330110444030 and JCYJ20200109114018750);Shenzhen University(No.2019075)。

摘　　要：A new type of power-exponent-phase vortex-like beams with both quadratic and cubic azimuthal phase gradients is investigated in this work.The intensity and orbital angular momentum(OAM)density distributions are noticeably different when the phase gradient increases or decreases along the azimuth angle,while the orthogonality and total OAM remain constant.The characteristics of the optical field undergo a significant change when the phase shifts from linear to nonlinear,with the variation of the power index having little impact on the beam characteristics under nonlinear phase conditions.These characteristics provide new ideas for applications such as particle manipulation,optical communications,and OAM encryption.

关 键 词：optical vortex orbital angular momentum optical spiral azimuthally varying phase gradient 

分 类 号：O43[机械工程—光学工程]