[7a-A409-1~8] 4.7 Terahertz Photonics

▲ [7a-A409-4] Voltage Controlled liquid crystal terahertz phase shifter with Mg doped CuCrO₂
transparent electrodes

〇(M2)Jun-Ting Guo¹, U-Hong Cheang¹, Te-Wei Chiu³, Chao-Kuei Lee^1,2 (1.Dep. of Photonics for NSYSU, 2.Dep. of Physics for NSYSU, 3.Dep. of Materials and Mineral Resources Engineering for National Taipei University of Technology)

Keywords:terahertz, phase shifter, CuCrO2

Terahertz (THz) photonics have been attracted much attention due to its remarkable
progress [1]. Many LC devices in the visible to near-infrared range are driven using electric
fields applied through transparent electrodes such as indium tin oxide (ITO) thin films.
However, the inevitable absorption of ITO in THz region limits its application. [2] The
alternative electrode for THz is still desired although several of approach suc h as nano-structure
of reducing thickness of ITO have been proposed. In this work, Mg doped CuCrO₂ films has
been demonstrated its high transmittance in THz region. photonics. In addition, liquid crystal
based terahertz (THz) phase shifter using CuCrO₂:Mg as electrode was fabricated. Phase shift
of around 2π at 1 THz was demonstrated. This is the first time to our best knowledge that
CuCrO₂:Mg can be used to fabricate THz phase shifter. The result reveal its potential for THz
photonics.