Reflectance-tunable terahertz polarization reflector using indium tin oxide

摘要

Indium tin oxide (ITO) is a transparent conductive material that is widely used in optical display applications and terahertz (THz) devices. This paper proposes an ITO-based THz polarization reflector. The proposed reflector is based on the wire-grid ITO pattern and glass substrate, with tunable THz reflectance, high optical transparency, and excellent stability. The performance of the proposed reflector is demonstrated and validated through experiments using a CW THz system and a UV-Vis spectrometer. The experimental results are in good agreement with the numerical simulation. The proposed reflector has a tunable THz reflectance from 0.5 to 0.97 in the THz frequency range (0.22-0.5 THz) and a high optical transmittance of approximately 60% in the wavelength range 450-800 nm. The proposed device successfully optimizes the radiation path in THz and optical hybrid systems to significantly improve the system performance. The work presented in this paper provides a new method for designing THz devices based on transparent conductive materials.