Terahertz Optical Properties and Birefringence in Single Crystal Vanadium doped [100] \b{eta}-Ga2O3

TL;DR

This study investigates the terahertz optical properties and birefringence of Vanadium-doped eta-Ga2O3 single crystals, revealing their potential as tunable waveplates in the terahertz frequency range.

Contribution

It provides the first detailed measurement of birefringence and phase retardation in V-doped eta-Ga2O3 using THz-TDS and THz-TDP, demonstrating their waveplate capabilities.

Findings

Strong birefringence observed in 0.2-2.4 THz range

V-doped eta-Ga2O3 acts as quarter and half waveplate at specific THz frequencies

Phase retardation measured across the entire THz range

Abstract

We report the Terahertz optical properties of the Vanadium doped [100] \b{eta}-Ga2O3 using Terahertz Time-Domain Spectroscopy (THz-TDS). The V-doped \b{eta}-Ga2O3 crystal shows strong birefringence in the 0.2-2.4 THz range. Further, phase retardation by the V-doped \b{eta}-Ga2O3 has been measured over the whole THz range by Terahertz Time-Domain Polarimetry (THz-TDP). It is observed that the V-doped \b{eta}-Ga2O3 crystal behaves both as a quarter waveplate (QWP) at 0.38, 1.08, 1.71, 2.28 THz, and a half waveplate (HWP) at 0.74 and 1.94 THz, respectively.