Abstract
Vanadium dioxide (VO2) has been widely used in tunable terahertz (THz) metamaterial absorbers. So far, many kinds of tunable broadband or dual-broadband THz metamaterial absorbers based on VO2 have been proposed. However, tunable triple-broadband THz metamaterial absorbers have been rarely investigated. In this paper, we present a tunable triple-broadband THz metamaterial absorber using a single VO2 circular ring. The absorptivity of proposed absorber exceeds 90% in the three frequency bands of 0.73–3.08 THz, 4.83–7.13 THz and 8.72–11.12 THz, and the absorption bandwidths are 2.35 THz, 2.30 THz and 2.40 THz, respectively. We can continuously tune the absorptivity from 20% to over 90% by altering the conductivity of VO2. The physical mechanism of triple-broadband absorption is explained by the electric field distributions at absorption peaks. The influences of incident and polarization angles on the absorption performance are also investigated.
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