Abstract
We present a design of electric split-ring resonators (eSRR) to explore its electromagnetic coupling effect. eSRR is composed of metal-insulator-metal (MIM) configuration. The equivalent circuit of eSRR has multiple capacitors and inductors to provide multiple resonant frequencies in the THz frequency range. By changing the gaps within eSRR, some resonances can be continuously red-shifted and some resonances can remain stable. These tunable resonances are high Q-factors. The maximum Q-factor is 206. The stable resonances allow the eSRR device in the use of vibrating environment. Furthermore, eSRR possesses optical “on” and “off” states operated in transverse electric (TE) and transverse magnetic (TM) modes. eSRR device shows three resonances at 0.19 THz, 0.43 THz, 0.68 THz. The first resonance at 0.19 THz only appears in TM mode, the second and third resonances only appear in TE mode. This polarized switching function can perform the programmable multidigit characteristic. Therefore, eSRR shows the switching characteristics during the alternating of TM and TE modes. Such optical properties of eSRR with MIM configuration provide the potential possibilities of THz metamaterial to be used in the sensors, programmable devices, radars, and optical communication applications.
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