Abstract
We present four designs of actively tunable micro-electro-mechanical system-based racetrack-shaped metamaterials (RSMs), which are denoted as RSM_1, RSM_2, RSM_3, and RSM_4, respectively. RSM_1 is composed of asymmetrically single RSM, while RSM_2, RSM_3, and RSM_4 are all composed of asymmetrically double RSM layers with different rotation angles of 0°, 90°, and 180°, respectively. RSM_1 exhibits single-resonance in the transverse electric mode and dual-resonance in the transverse magnetic mode to perform the polarization-dependent characteristic. RSM_2, RSM_3, and RSM_4 exhibit tunable multi-resonance characteristics. By changing the height of the suspended layer, RSM_2, RSM_3, and RSM_4 exhibit optical switching characteristics. These switching resonances can be equivalent to binary bits, i.e., “0” and “1,” which can be programmed for opto-logic applications. These four designs of RSM devices possess the programmable multidigit switching characteristic by changing the incident polarization light. This study provides the possibility of a terahertz metamaterial to be used in the switch, programmable device, radar, and optical wireless communication applications.
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