Engineered photonic spin Hall effect of Gaussian beam in antisymmetric parity-time metamaterials  

作　　者：刘露遥 冯振校 邓冬梅 王光辉 Lu-Yao Liu;Zhen-Xiao Feng;Dong-Mei Deng;Guang-Hui Wang(Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,South China Normal University,Guangzhou 510006,China;Guangzhou Key Laboratory for Special Fiber Photonic Devices,South China Normal University,Guangzhou 510006,China)

机构地区：[1]Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,South China Normal University,Guangzhou 510006,China [2]Guangzhou Key Laboratory for Special Fiber Photonic Devices,South China Normal University,Guangzhou 510006,China

出　　处：《Chinese Physics B》2023年第9期255-260,共6页中国物理B（英文版）

基　　金：the Natural Science Foundation of Guangdong Province(Grant Nos.2018A030313480 and 2022A1515012377)。

摘　　要：A model of the photonic spin Hall effect(PSHE)in antisymmetric parity-time(APT)metamaterials with incidence of Gaussian beams is proposed here.We derive the displacement expression of the PSHE in APT metamaterials based on the transport properties of Gaussian beams in positive and negative refractive index materials.Furthermore,detailed discussions are provided on the APT scattering matrix,eigenstate ratio,and response near exceptional points in the case of loss or gain.In contrast to the unidirectional non-reflection in parity-time(PT)symmetric systems,the transverse shift that arises from both sides of the APT structure is consistent.By effectively adjusting the parameters of APT materials,we achieve giant displacements of the transverse shift.Finally,we present a multi-layer APT structure consisting of alternating left-handed and right-handed materials.By increasing the number of layers,Bragg oscillations can be generated,leading to an increase in resonant peaks in transverse shift.This study presents a new approach to achieving giant transverse shifts in the APT structure.This lays a theoretical foundation for the fabrication of related nano-optical devices.

关 键 词：antisymmetric parity-time photonic spin Hall effect Gaussian beam 

分 类 号：O469[理学—凝聚态物理]