Reconfigurable double C-shape metamaterial (DCM) for a terahertz resonator

Abstract

We present a reconfigurable terahertz (THz) resonator using double C-shape metamaterials (DCM) that can be used as filter and single-/dual-resonance switch. By changing the position of the C-shape metamaterial along x-axis and y-axis directions, the resonances can be modulated from single-resonance to dual-resonance in TE mode and the corresponding free spectrum range (FSR) can be changed from 0.19 THz to 0.09 THz. These results indicate the proposed DCM can be used as a single-/dual-resonance switch and polarization switch. To increase the tunability, flexibility, and applicability of DCM, the resonant frequency could be tuned by changing the gap between DCM with the dual-layer. The resonances are blue-shifted 0.04 THz from 0.22 THz to 0.26 THz (1st resonance) and 0.11 THz from 0.36 THz to 0.47 THz (2nd resonance) in TE mode. The relationship of resonance and gap variation is quite stable and linear. This design of DCM provides a potential possibility of feasible opto-electronics applications in the THz frequency range.