Programmable VO2 metasurface for terahertz wave beam steering
Daquan Yang,
Weiguang Wang,
Erpeng Lv,
Haiming Wang,
Bingchao Liu,
Yanzhao Hou,
Jin-hui Chen
Affiliations
Daquan Yang
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China; State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
Weiguang Wang
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Erpeng Lv
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Haiming Wang
Lenovo Research, Beijing 100094, China
Bingchao Liu
Lenovo Research, Beijing 100094, China
Yanzhao Hou
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China; National Engineering Laboratory for Mobile Network Technologies, Beijing University of Posts and Telecommunications, Beijing 100876, China; Corresponding author
Jin-hui Chen
Institute of Electromagnetics and Acoustics, Xiamen University, Xiamen 361005, China; Corresponding author
Summary: Programmable vanadium dioxide (VO2) metasurface is proposed at THz frequencies. The insulating and metallic states of VO2 can be switched via external electrical stimulation, resulting in the dynamical modulation of electromagnetic response. The voltages of different columns of the metasurface can be controlled by the field-programmable gate array, and thus the phase gradients are realized for THz beam steering. In 1-bit coding, we design periodic and nonperiodic 24 × 24 coding sequences, and achieve wide-angle beam scanning with the deflection angles from −60° to +60°. In 2-bit coding, we use two different meta-atoms to design 18 × 18 coding sequences. Compared with 1-bit coding, 2-bit coding has more degree of freedom to control the optical phase, and 3 dB diffraction efficiency is improved by generating a single deflection angle. The proposed programmable metasurfaces provide a promising platform for manipulating electromagnetic wave in 6G wireless communication.
