Figure 1
From: Vanadium dioxide-assisted broadband tunable terahertz metamaterial absorber
Hybrid VO2 metamaterial and broadband tunable THz absorber. (a) Schematic diagram of the proposed hybrid VO2 MMA, including a middle layer of the PI dielectric spacer (the cyan region) with the thickness d = 20 μm, a top layer of the symmetrical L-shaped VO2 metasurface structure with the thickness t1 = 2 μm, and a bottom layer of the VO2 ground plate (the purple region) with the thickness t2 = 4 μm. (b) Front view of a unit cell, the geometric parameters are l = 30 μm, w = 2 μm, Px = Py = 50 μm. (c–f) Simulated THz spectrum of the proposed hybrid VO2 MMA at different temperatures for TE mode. (c) Transmission. (d) Reflection. (e,f) Absorption for the heating and cooling processes. (g) Absorption spectrum of the proposed broadband absorber at the high temperature (70 °C) for different incident angles of THz waves.
