Polarization-independent double-layer transmission two-dimensional slanted grating under normal incidence

Yuda Chen; Changhe Zhou; Yihan Wang; Xingxue Li; Wei Jia; Jin Wang

doi:10.1117/12.2687062

27 November 2023 Polarization-independent double-layer transmission two-dimensional slanted grating under normal incidence

Yuda Chen, Changhe Zhou, Yihan Wang, Xingxue Li, Wei Jia, Jin Wang

Author Affiliations +

Proceedings Volume 12768, Holography, Diffractive Optics, and Applications XIII; 127681S (2023) https://doi.org/10.1117/12.2687062
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

This paper proposed a transmission two-dimensional (2D) slanted grating based on a double-layer cylindrical structure. We used rigorous coupled-wave analysis (RCWA) and simulated annealing algorithm (SA) to optimize the grating parameters. Results show that the diffraction efficiency of the (-1,0) and (0,-1) order exceed 35% under normal incidence in the range of 429–468 nm wavelength for TE and TM polarization. Meanwhile, the total diffraction efficiency can reach up to 78%. We also discuss the tolerances for the grating parameters to ensure high quality manufacturing processes. The relatively large tolerances ensure fabrication of the two-dimensional slanted grating and provides the possibility for practical applications. The proposed 2D slanted grating can be applied to 2D exit pupil expansion, which is of great importance in AR/VR applications.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yuda Chen, Changhe Zhou, Yihan Wang, Xingxue Li, Wei Jia, and Jin Wang "Polarization-independent double-layer transmission two-dimensional slanted grating under normal incidence", Proc. SPIE 12768, Holography, Diffractive Optics, and Applications XIII, 127681S (27 November 2023); https://doi.org/10.1117/12.2687062

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