Modulation of the absorption properties of a dual band metamaterial based on VO2 thin films

Abstract

A temperature tunable dual band metamaterial absorber is designed and fabricated. An absorption peak at 1.08 THz is derived from the localized surface plasmon (LSP) mode, while another absorption peak at 1.75 THz is derived from the cavity resonance mode. When different gases are applied to the sample surface, the amplitude and the resonance frequency of the absorption peak at 1.08 THz are modulated. When different liquids are applied to the sample surface, the amplitude of the absorption peak at 1.08 THz is reduced and the resonance frequency is shifted to lower frequencies. The original resonance properties of the absorption peak at 1.08 THz are basically preserved during the measured temperature increase and decrease. The absorption peak at 1.75 THz is sensitive to changes in temperature. The absorption amplitude and resonance frequency are both controlled in the measured temperature increase and decrease.