A novel terahertz device with multi-function of polarization and switch based on phase transition of VO₂

Abstract

A terahertz (THz) polarizer and switch structure is proposed based on the phase transition of vanadium dioxide (VO₂). When VO₂ is in the insulation phase, the resonance frequencies of the proposed structure are 1.49 THz and 1.22 THz for the x- and y-polarization, respectively. It can perform as a THz polarizer with extinction ratios of 52.5 dB and 17 dB for the y- and x-polarization, respectively; When VO₂ transforms into metallic phase, the resonance frequency for x-polarization wave shifts from 1.49 THz to 1.22 THz, while that remains still for the y-polarization component. It means that the structure can work as a polarization-dependent THz switch with a high extinction ratio of 32 dB.

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