Tunable terahertz wave Goos–Hänchen shift of reflected terahertz wave from prism–metal–polymer–metal multilayer structure

Abstract

We propose a scheme to manipulate the Goos–Hänchen shift of a terahertz wave reflected from the prism–metal–polymer–metal interface via external voltage bias. By adjusting the external voltage bias, the refractive index of the nonlinear polymer can be changed, so the lateral Goos–Hänchen shift is dynamically tuned. The relation among the Goos–Hänchen shift, prism and the nonlinear polymer is investigated in theory analysis and simulation. Using this scheme, the Goos–Hänchen shift can be tuned without changing the original structure of the proposed device. Numerical calculation results further indicate that the proposed structure has the potential application for the integrated terahertz wave switch.