Abstract

Spatial terahertz wave modulators that can arbitrarily tailor the electromagnetic wavefront are in high demand in nondestructive inspections and high-capacity wireless communications. Here, we propose a liquid crystal integrated metadevice. It modulates the terahertz wave based on the adjustable electromagnetically induced transparency analog when spatially changing the environmental refractive index. The functions of the device can be arbitrarily programmed via photo-reorienting the directors of liquid crystals with a digital micromirror device-based exposing system. The thin liquid crystal layer can be further driven by an electric field, and thus the function can be rapidly switched. Amplitude modulation and the lens effect are demonstrated with modulation depths over 50% at 0.94 THz.

© 2023 Chinese Laser Press

Transflective spatial terahertz wave modulator

ShiNa Tao, ZhiXiong Shen, HongGuan Yu, HuaCai Wang, ShiJun Ge, and Wei Hu
Opt. Lett. 47(7) 1650-1653 (2022)

Liquid-crystal-integrated metadevice: towards active multifunctional terahertz wave manipulations

Zhixiong Shen, Shenghang Zhou, Shijun Ge, Wei Duan, Peng Chen, Lei Wang, Wei Hu, and Yanqing Lu
Opt. Lett. 43(19) 4695-4698 (2018)

MEMS reconfigurable metamaterial for terahertz switchable filter and modulator

Zhengli Han, Kenta Kohno, Hiroyuki Fujita, Kazuhiko Hirakawa, and Hiroshi Toshiyoshi
Opt. Express 22(18) 21326-21339 (2014)

Electromagnetic behavior of spatial terahertz wave modulators based on reconfigurable micromirror gratings in Littrow configuration

Jan Kappa, Klemens M. Schmitt, and Marco Rahm
Opt. Express 25(17) 20850-20859 (2017)

Switchable broadband terahertz spatial modulators based on patterned graphene and vanadium dioxide

Longfang Ye, Xueer Chen, Chunhui Zhu, Weiwen Li, and Yong Zhang
Opt. Express 28(23) 33948-33958 (2020)