Design and measure of a temperature controllable terahertz metamaterials

Abstract

In this paper, a tunable hybrid metamaterials is numerically simulated and experimentally verified. An absorption peak (88.2%) at 18.2 λ is achieved at room temperature, and the measured full width at half maximum bandwidth (FWHM) is 0.37 μm. The localized surface plasmon (LSP) mode resonance results in the absorption peak at 18.2 μm. The absorption peak is enhanced and shifted to longer wavelength with the radius R increasing in experiments. Moreover, when the measured temperature is increased, two new absorption peaks (72.3% and 21.1%) are achieved at 14.9 μm and 21.7 μm. Two LSP mode resonance forms are found due to the VO2 disk shows metal nature at 69 °C. Both of new absorption peaks are enhanced and shifted to shorter wavelengths with the measured temperature increasing. This structure design methodology of metamaterials can be applied for achieving single band structure to dual band structure.