All-optical controlled-NOT logic gate achieving directional asymmetric transmission based on metasurface doublet

• Published in: Opto-Electronic Advances 2023-01, Vol.6 (7), p.220073-220073
• Main Authors: Huang, Yijia, Xiao, Tianxiao, Chen, Shuai, Xie, Zhengwei, Zheng, Jie, Zhu, Jianqi, Su, Yarong, Chen, Weidong, Liu, Ke, Tang, Mingjun, Müller-Buschbaum, Peter, Li, Ling
• Format: Article
• Language: English
• Subjects: asymmetric transmission; logic gate; metasurface; polarization control
• ISSN: 2096-4579
• DOI: 10.29026/oea.2023.220073

Optical logic gates play important roles in all-optical logic circuits,which lie at the heart of the next-generation optical computing technology.However,the intrinsic contradiction between compactness and robustness hinders the develop-ment in this field.Here,we propose a simple design principle that can possess multiple-input-output states according to the incident circular polarization and direction based on the metasurface doublet,which enables controlled-NOT logic gates in infrared region.Therefore,the directional asymmetric electromagnetic transmission can be achieved.As a proof of concept,a spin-dependent Janus metasurface is designed and experimentally verified that four distinct images corres-ponding to four input states can be captured in the far-field.In addition,since the design method is derived from geomet-ric optics,it can be easily applied to other spectra.We believe that the proposed metasurface doublet may empower many potential applications in chiral imaging,chiroptical spectroscopy and optical computing.