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JIAQI LI1, JIAMING REN1, WENKUN PENG1, PEIHONG ZENG1, YUSEN HUANG1, YUQING XIAO1, JINJIE LI1, HONGWEI ZHAN1, BO WANG1,* , QU WANG1, FANGTENG ZHANG1
A novel reflective grating with a sandwiched structure is proposed. Under the normal incidence, the grating can function as a dual-port beam splitter. Rigorous coupled-wave analysis (RCWA) is used to optimize the grating for high efficiency. Based on the optimized parameters, high efficiency of the ±1st orders of 48.17% for transverse electric (TE) polarization and 48.19% for transverse magnetic (TM) polarization can be achieved, where the 0th order is less than 0.99% for TE and TM polarizations, and the total efficiency can reach 98%. Simultaneously, we effectively analyzed and verified the device data using simplified modal method (SMM), finite element method (FEM), and electric field distribution. In addition, the proposed grating also has a good performance at a bandwidth of 64 nm and the duty cycle of 0.668-0.732.
Subwavelength grating, Multilayer structure, Normal incidence, Dual-port splitter.
JIAQI LI, JIAMING REN, WENKUN PENG, PEIHONG ZENG, YUSEN HUANG, YUQING XIAO, JINJIE LI, HONGWEI ZHAN, BO WANG, QU WANG, FANGTENG ZHANG, The dual-port splitter with >48% efficiency in ±1st diffraction orders, Optoelectronics and Advanced Materials - Rapid Communications, 19, 9-10, September-October 2025, pp.395-403 (2025).
Submitted at: Jan. 14, 2025
Accepted at: Oct. 10, 2025
Optoelectronics and Advanced Materials - Rapid Communications
(2024): Impact Factor = 0.4 - Journal Citation Reports (Clarivate Analytics, 2025)
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