Thermal Tunable Terahertz Wave Goos–Hänchen Shift

We propose a new scheme to manipulate a terahertz wave beam. By adjusting an external ambient temperature, the refractive index of the temperature-sensitive material can be changed, so the giant lateral Goos–Hänchen shift is dynamically tuned. Using this scheme, the terahertz wave can be controlled without changing the original device structure. The relations among the Goos–Hänchen shift, external ambient temperature, incidence angle, and operation frequency are investigated in theory analysis. The finite-element method is used to verify and analyze the characteristics of the tunable terahertz wave Goos–Hänchen shift. The present device exhibited an extinction ratio of 24.3 dB at terahertz wave wireless communication frequency of 0.857 THz.