Tunable Multiband Terahertz Metamaterial with Bidirectional Polarization-Dependent Characteristic

Abstract

We present a tunable terahertz (THz) metamaterial (TTM) composed of chain-link split-ring resonators (SRRs), which is the composition of a tailored Au layer on Si substrate. TTM exhibits bidirectional multi-band polarization-dependent characteristic by applying a directcurrent (dc) bias voltage on device. The chain-link SRRs of TTM can be heated up the surrounding temperature to tune the corresponding resonance. The tuning range is 0.027 THz from 0.318 THz to 0.291 THz on the bias of 0.60 V to 1.32 V. By reconfiguring the gap between chain-link SRRs of TTM, there are single-resonance with red-shift at TE mode, and multiresonance with blue-shift and red-shift at TM mode, respectively. These characterizations of TTM are polarization-dependence and bidirectional tunability. These results show the electromagnetic responses of proposed TTM device is suitable for the uses for resonator, filter, switch, and sensor in the THz frequency range.