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Silicon arrays as four-port optical splitting controller for terahertz band

XIAOQING ZHU1, BO WANG1,* , YUSEN HUANG1, ZHICHAO XIONG1, JIAHAO LI1, XIAOFENG WANG1, HONG ZOU1, JINHAI HUANG1, WEIYI YU1

Affiliation

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China

Abstract

A four-port terahertz beam splitter with a metallic aluminum reflecting layer is proposed, which offers high efficiency, effective zeroth-order suppression and polarization-independent properties. The grating parameters are optimized by means of rigorous coupled-wave analysis and simulated annealing. The optimized grating has a diffraction efficiency of 24.72% and 23.82% for ±1st and ±2nd orders respectively under transverse electric polarization, and 24.64% and 24.12% for ±1st and ±2nd orders respectively under transverse magnetic polarization at 118.83 μm polarization (i.e. 2.52 terahertz band). In addition, the electric field distribution map of the beam splitter can be analyzed by the finite element method, which can well explain the optical transmission mechanism inside the grating. The simple structure of the target grating and the good process tolerance also take advantage in its practical application..

Keywords

Terahertz device, Grating beam splitter, Polarization independent.

Submitted at: Dec. 25, 2021
Accepted at: Oct. 5, 2022

Citation

XIAOQING ZHU, BO WANG, YUSEN HUANG, ZHICHAO XIONG, JIAHAO LI, XIAOFENG WANG, HONG ZOU, JINHAI HUANG, WEIYI YU, Silicon arrays as four-port optical splitting controller for terahertz band, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 9-10, pp. 419-425 (2022)