Liquid Crystal Based Terahertz Phase Shifter with Bi-Layer Structure

Abstract

We propose and demonstrate a liquid crystal (LC) based terahertz phase shifter with a thick (550 mu m in total) bi-layer LC cell structure incorporating a thin transparent polymeric intermediate layer. The present phase shifter exhibited remarkable performance improvement. The phase shift increased from 94 degrees to 111 degrees; threshold and drive voltages decreased from 2.2 V-RMS to 1 V-RMS and from 10 V-RMS to 8.4 V-RMS, respectively, in comparison with those for single-layer cell structure.