Dynamical tuning multifunctional and nonreciprocal polarization conversion by twisting twin Weyl-semimetal layers  

作　　者：Guangfan Liu Shuai Deng Sen Hong Qiongxiong Ma Chengping Yin Kunyuan Xu 刘光帆;邓帅;洪森;马琼雄;尹承平;许坤远

机构地区：[1]Key Laboratory of Atomic and Subatomic Structure and Quantum Control(Ministry of Education),Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter,School of Physics,South China Normal University,Guangzhou 510006,China [2]Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,South China Normal University,Guangzhou 510006,China [3]Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,Guangdong-Hong Kong Joint Laboratory of Quantum Matter,South China Normal University,Guangzhou 510006,China

出　　处：《Chinese Optics Letters》2025年第1期134-139,共6页中国光学快报(英文版)

基　　金：supported by the Guangdong Provincial Key Laboratory(No.2020B1212060066)。

摘　　要：Recently,polarization conversion based on the equivalent magnetic field of Weyl semimetals(WSMs)has gained significant attention.Based on a twin WSM-layer structure,we transplant the concept of twist from Twistronics to obtain a dynamically tunable polarization converter with multifunctions and nonreciprocity.One-way conversion of linear polarization to its orthogonal state can be obtained and tuned by twisting the converter.Moreover,nonreciprocal conversion from linear polarization to elliptical polarization(with ellipticity linearly tuned from-1 to 1 by twisting the converter)in one way and to quasi-linear polarization in the other way can be obtained.Calculations show that the converter achieves 95%efficiency,high optical isolation(100 d B),and low insertion loss(<2 d B).The proposal may find applications in tunable and nonreciprocal devices for integrated photonics.

关 键 词：NONRECIPROCITY polarization conversion tunable TWISTING Weyl semimetals 

分 类 号：O469[理学—凝聚态物理]