Abstract
We investigate thermally tunable interface modes based on liquid-crystal-filled corrugated waveguide (CW) systems. The CW systems, consisting of two CWs with different topological properties, can create interface modes with very narrow transmission peaks. Based on the thermal properties of liquid crystals (LCs), the interface modes can be used as tunable narrow band filters and thermal sensors. The simulation results show that the frequencies of the generated interface modes can be tuned by changing the connection phase of these two waveguides. Tunability can be achieved by dynamically shifting the interface mode of a terahertz (THz) spectrum by using the external temperature to change the effective refractive index of nematic LC (E7). The maximum tunable frequency range of interface modes is 0.7965–0.8174 THz (over 20 GHz), the achieved narrowest bandwidth is 0.7 GHz, and the maximum Q-factor can reach 1045. Based on these advantages, the proposed CW systems can also be used for high performance temperature sensing and their maximum sensitivity can reach 0.6967 GHz °C−1.
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