Beam separating with the zeroth order eliminated by sandwiched grating
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
In this paper, a two-port encapsulated grating with a connecting layer is demonstrated, which can suppress 0th order under
the condition of normal incidence. When the incident light wavelength is 800 nm, the diffraction efficiencies of ±1st orders
exceed 44% and that of 0th order is less than 3% under transverse electric and transverse magnetic polarizations. In addition,
the fabrication tolerance of the grating is also brilliant. In the period range of 1541-1632 nm and the duty cycle of 0.27-0.36, the
diffraction efficiencies of ±1st orders can reach more than 42%. In this paper, the parameters of the grating are optimized by
rigorous coupled-wave analysis. Furthermore, the results show that the proposed grating has important application in optical
communication, optical storage, etc.
Sandwiched grating, Two-port output, Elimination of the zeroth order, Beam splitter.
XIAOQING ZHU, BO WANG, JIAHAO LI, XIAOFENG WANG, HONG ZOU, LIQUN LIU, LINJIAN HUANG, XU YANG, WEIYI YU, JINHAI HUANG, Beam separating with the zeroth order eliminated by sandwiched grating, Optoelectronics and Advanced Materials - Rapid Communications, 16, 9-10, September-October 2022, pp.407-413 (2022).
Submitted at: July 16, 2021
Accepted at: Oct. 5, 2022