1. Reconfigurable terahertz rainbow deflector
- Author
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Jiacheng Cai, Peiheng Wu, Caihong Zhang, Benwen Chen, Qi-Ye Wen, Jingbo Wu, Taofeng Wang, Qiang Xue, Biaobing Jin, Yi-Hang Li, and Jian Chen
- Subjects
010302 applied physics ,Brewster's angle ,Materials science ,Physics and Astronomy (miscellaneous) ,Terahertz radiation ,business.industry ,Frequency band ,Beam steering ,Reflector (antenna) ,02 engineering and technology ,Grating ,021001 nanoscience & nanotechnology ,01 natural sciences ,symbols.namesake ,Optics ,0103 physical sciences ,Broadband ,symbols ,0210 nano-technology ,business ,Beam (structure) - Abstract
Dynamic terahertz (THz) beam steering is a promising technique for numerous applications, including communication, high-resolution imaging, and radar. However, advances in this technology are considerably limited by inadequate broadband and active phase shifters at THz frequencies. In this paper, we developed a type of VO2-based device capable of broadband THz beam steering. The effect of the tunable Brewster angle of the VO2 thin film along with the insulator-to-metal transition process was verified. We demonstrated that the VO2 grating could realize a dispersive beam deflector in a broad frequency band. Furthermore, upon heating, the VO2 grating could switch between three states of mirror reflector, “rainbow” deflector, and metallic grating. We believe that the proposed reconfigurable and broadband THz beam deflector offers a powerful avenue for manipulating THz beams.
- Published
- 2021
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