Tunable ultra-broadband terahertz metamaterial absorber based on vanadium dioxide strips

Abstract

A simple design of a tunable ultra-broadband metamaterial absorber of terahertz (THz) radiation based on vanadium dioxide (VO2) configurations is proposed, having wide incidence angle tolerance and polarization insensitivity.

An active controllable wide-angle and ultra-wideband terahertz absorber/reflector based on VO2 metamaterial

“…The conductivity of VO 2 reached approximately 28 S m −1 with temperature. 22 As shown in Fig. 3(a), cooling always lagged by 6 K, compared with heating, and hysteresis was observed during the conversion of VO 2 from the insulated into the metallic states.…”

Ultra-high Q-factor and amplitude-tunable Fano resonance in vanadium dioxide–silicon hybrid metamaterials

“…Therefore, the plasma frequency at σ frequency can be roughly expressed as ω p 2 ( σ ) = σω p 2 ( σ 0 )/ σ 0 , where σ 0 = 3 × 10 3 Ω −1 S −1 , ω p ( σ 0 ) = 1.4 × 10 15 rad s −1 , and γ = 5.75 × 10 13 rad s −1 . 29,30 Terahertz plane wave was positively incident along the z -axis to the proposed metamaterial. The S parameter can be calculated by the FDTD theory, and the transmission T can be obtained by T = | S 21 | 2 .…”

Design of an ultra-wideband and switchable VO2-based microwave absorber

“…Therefore, Vanadium dioxide (VO 2 ), a phase change material, suffers a fast response, large modulation depth, and multiple modulation methods [29], as well as a low phase change temperature of 68° [30] is widely used for the design of metamaterial device with the switchable functionalities. However, most of these studies have successfully designed switchable terahertz broadband MA structures [31][32][33][34][35][36][37][38][39][40][41], but very few investigations of switchable MAs using VO 2 for microwave regions have been reported so far [42]. Hence, many efforts have been explored to design a switchable microwave MA structure having both large bandwidth and high absorption performance as recently reported [42,43].…”