Switchable Spin-Selective Transmission in Nano-Kirigami Metasurfaces  

作　　者：Yating Jin Shanshan Chen Chenxi Gu Shuguang Li 靳亚婷;陈珊珊;谷晨曦;李曙光(Key Laboratory for Microstructural Material Physics of Hebei Province,School of Science,Yanshan University,Qinhuangdao 066000,China)

机构地区：[1]Key Laboratory for Microstructural Material Physics of Hebei Province,School of Science,Yanshan University,Qinhuangdao 066000,China

出　　处：《Chinese Physics Letters》2025年第3期69-73,共5页中国物理快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.62205282 and 12074331);the Hebei Natural Science Foundation(Grant No.A2022203035);the Science and Technology Project of Hebei Education Department(Grant No.BJK2023009)。

摘　　要：Polarization control and modulation of optical signals play a crucial role in optical information transmission,with widespread applications in optical communication,sensing,and signal processing.Here,we propose an intrinsically chiral nano-kirigami metasurface featuring out-of-plane twisting,which enables switchable spinselective light transmission.At the operating wavelength,it nearly completely blocks the transmission of one type of circularly polarized light while maintaining a transmission exceeding 70%for the other type.Crucially,by merely adjusting the rotation angles or deformation heights of the four arms of the nano-kirigami structures,the metasurface can switch from selective transmission of left-handed circularly polarized light to right-handed circularly polarized light,and vice versa,without the need for dramatic structural geometric chirality changes through mirror operations.Simultaneously,a remarkable circular dichroism of up to 0.74 is achieved,and its sign reverses with the transition of transmission.Electromagnetic multipolar analysis reveals that this switching of chiral response is governed by handedness-dependent excitations of toroidal dipole modes.Additionally,the spin-encoded near-field imaging results demonstrate the potential applications of this switchable spin-selective transmission based on nano-kirigami metasurfaces in digital imaging and chiroptical encryption.

关 键 词：CIRCULAR EXCEEDING MIRROR 

分 类 号：TN2[电子电信—物理电子学]