AUTHOR=Deng Yuwang , Zhou Qingli , Zhang Xuteng , Zhang Pujing , Liang Wanlin , Ning Tingyin , Shi Yulei , Zhang Cunlin 

TITLE=Multi-state polarization switching and multifunction-integrated terahertz metadevice enabled by inverse resonance responses

JOURNAL=Frontiers in Physics

VOLUME=Volume 11 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2023.1234054

DOI=10.3389/fphy.2023.1234054

ISSN=2296-424X

ABSTRACT=Dynamical control of terahertz metadevices and integration of versatile functions are highly desired due to the increasing practical demands. Here, we propose a multifunctional photosensitive-Si hybrid metastructure consisting of twisted split-ring resonator pairs that could empower multi-state polarization switching and object-recognized imaging. The theoretical and simulated results show that inverse complete modulation of cross-polarized components could be realized via tuning the conductivity of Si-bridge. The calculated ellipticity indicates that our metadevices possess the abilities to convert linearly polarized (LP) light into left-hand circular-polarized (LCP) or right-hand circularpolarized (RCP) waves, as well as LCP or RCP into LP states. Combined with these properties, monoparameter amplitude imaging and amplitude-phase synergistic encryption imaging are accomplished. Our research provides a new strategy to develop reconfigurable and multifunctional components in terahertz regime.