Terahertz switch based on Otto configuration using spoof surface plasmon polariton

Terahertz wave switch based on Otto coupling configuration and periodic metal V-groove structure is proposed. The reflection terahertz wave intensity from the prism-air-vanadium dioxide-metal interface is controlled by via changing external temperature. By adjusting the external temperature, the refractive index of vanadium dioxide can be changed, so that the terahertz wave reflectivity according to geometrical optics reflection is dynamically controlled. The numerical results further show that the present structure can flexibly manipulate terahertz wave transmission. The extinction ratio is about 20.18dB in our design, which has enormous potential for studying terahertz wave manipulation.