Dynamic bifunctional THz metasurface via dual-mode decoupling

Author:

Cong Xuan1ORCID,Zeng Hongxin1,Wang Shiqi1,Shi Qiwu2,Liang Shixiong3,Sun Jiandong4,Gong Sen12ORCID,Lan Feng1,Yang Ziqiang1ORCID,Zhang Yaxin1

Affiliation:

1. University of Electronic Science and Technology of China

2. Sichuan University

3. National Key Laboratory of Application Specific Integrated Circuit

4. Chinese Academy of Sciences

Abstract

Metasurfaces have powerful light field manipulation capabilities and have been researched and developed extensively in various fields. With an increasing demand for diverse functionalities, terahertz (THz) metasurfaces are also expanding their domain. In particular, integrating different functionalities into a single device is a compelling domain in metasurfaces. In this work, we demonstrate a functionally decoupled THz metasurface that can incorporate any two functions into one metasurface and switch dynamically through external excitation. This proposed metasurface is formed by the combination of split-ring resonators and phase change material vanadium dioxide ( VO 2 ). It operates in the single-ring resonant mode and double-ring resonant mode with varying VO 2 in insulating and metallic states, respectively. More importantly, the phase modulation is independent in two operating modes, and both cover a 360° cross-polarized phase with efficient polarization conversion. This characteristic makes it obtain arbitrary independent phase information on the metasurface with different modes to switch dual functions dynamically. Here, we experimentally demonstrate the functions of a tunable focal length and large-angle focus deflection of a THz off-axis parabolic mirror to verify the dual-function switching characteristics of the functionally decoupled metasurface. The functionally decoupled metasurface developed in this work broadens the way for the research and application of multifunctional modulation devices in the THz band.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Sichuan Science and Technology Program

China Postdoctoral Science Foundation

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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