Presentation Information
[9p-C213-12]Highly Efficient Terahertz Dynamic Metasurface with Vanadium Dioxide for Reversible Anomalous Reflection Angle Switching
〇(M1)Yasunao Okada1, Masataka Terai1, Yuki Ono1, Toshihiro Nakanishi2, Kunio Okimura3, Yosuke Nakata1, Atsushi Sanada1 (1.The Univ. of Osaka, 2.The Univ. of Shiga Pref., 3.Tokai Univ.)
Keywords:
Terahertz,metasurface,Vanadium Dioxide
Terahertz-wave manipulation has attracted considerable attention for sixth-generation (6G) wireless communications and high-precision sensing. In this study, a reflective dynamic metasurface incorporating vanadium dioxide was designed and fabricated. The metasurface was designed to generate opposite phase gradients in the insulating and metallic states of vanadium dioxide through its metal-insulator phase transition, enabling anomalous reflection angle switching between +60 deg and -60 deg at 500 GHz under normally incident TE-polarized waves. This enables a reversible angular tuning range of 120 deg. Experimental evaluation using a terahertz time-domain spectroscopy (THz-TDS) system demonstrated anomalous reflection angle switching while maintaining a power reflectance above 59%. In addition, reflection characteristics around the designed angles were measured to evaluate the angular distribution of the reflected beam and identify the direction of maximum reflection.