Multistate Nonvolatile Metamirrors with Tunable Optical Chirality

• DOI: 10.1021/acsami.1c14204
• Publication Date: 2021-09-14T18:13:06Z
• Authors: Yijia Huang; Tianxiao Xiao; Zhengwei Xie; Jie Zheng; Yarong Su; Weidong Chen; Ke Liu; Mingjun Tang; Jianqi Zhu; Peter Müller-Busc...; Ling Li
• Keywords: Chirality; Narrowband

Compared with conventional mirrors that behave as isotropic electromagnetic (EM) reflectors, metamirrors composed of periodically aligned artificial meta-atoms exhibit increased degrees freedom for EM manipulations. However, the functionality most is fixed by design, and how to achieve active control still elusive. Here, we propose a multistate metamirror based on nonvolatile phase change material Ge2Sb2Te5 (GST) four distinct functionalities can be realized in infrared region exploiting temperature-activated transition. When varying crystallinity GST, has capability perform right-handed circular polarization chiral mirror, narrowband achiral left-handed or broadband respectively. The inner physics further explained construction cancellation extrinsic two-dimensional chirality. As proof concept, experimental verification carried out measured results agree well their simulated counterparts. Such multifunctional tunable could address wide range applications from sensing spectroscopy analytical chemistry imaging.