Asymmetrically Polarization-Dependent Terahertz Metamaterial Resonator

Abstract

A design of asymmetrically polarization-dependent Terahertz (THz) metamaterial resonator is presented There are three designs with different length of F-shape metamaterial, which are $60 \mu m, 65 \mu m, and 70 \mu m$ kept other parameters as constant. The electromagnetic response of THz resonator exhibits the switch function for single-band resonance at transverse magnetic (TM) mode and dual-band resonance at transverse electric (TE) mode by changing the gap between F- shape metamaterials. These characterizations of device can be used for a THz filter at TM mode and a THz switch at TE mode. To compare the proposed device with and without a gap, that can be switched in the range of 0.20 THz to 0.40 THz for single-band switching resonance at TM mode and dual-band switching resonance at TE mode, respectively. These resonances have ultra-narrow bandwidths with a highest Q-factor of 41 at TE mode and 20 at TM mode. Such results are very suitable to be used for an environmental sensor. To enhance the flexibility of device, it is exposed on different surrounding environment with different refraction index. It shows the correlation coefficient is 0.9999 for high-efficiency environmental sensor application. This study paves away to the possibility of high-sensitivity of tunable THz metamaterial in filter, switch, polarizer, and other applications.