Design of encapsulated transmission grism with high diffraction efficiency and low polarization

Yuedan Wu; Huiying Chen; Muran He; Weimin Shen

doi:10.1117/12.2689070

28 November 2023 Design of encapsulated transmission grism with high diffraction efficiency and low polarization

Yuedan Wu, Huiying Chen, Muran He, Weimin Shen

Proceedings Volume 12765, Optical Design and Testing XIII; 127650W (2023) https://doi.org/10.1117/12.2689070
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

In view of the problems that the existing subwavelength transmission grating structure parameters require high processing technologies and are difficult to prepare, this paper explores and investigates the design simulation of encapsulated grism grating based on the finite element method (FEM). The variation of diffraction efficiency and polarization sensitivity of encapsulated grism is explored for different groove structures, trench depth and duty cycle, according to the requirements of high diffraction efficiency and low polarization sensitivity. The grating surface etched onto a fused silica substrate is formed by binary structure of grooves and trenches filled by a high refractive index multi-layer coating, working at Littrow configuration in the SWIR-1 (1590-1625nm) and SWIR-2 (1635-1670nm). The simulation results show that the average diffraction efficiency exceeds 85% and the polarization sensitivity is less than 5% with a wide tolerance range when the depth-period ratio is about 2 and the duty cycle is around 0.6. The diffraction efficiency and polarization sensitivity meet the design requirements, substantially improving the efficiency of transmission grating design and processing. This enables compact optical design to achieve high signal-to-noise ratio and low stray light to meet the critical radiation measurement accuracy requirements.

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

Citation Download Citation

Yuedan Wu, Huiying Chen, Muran He, and Weimin Shen "Design of encapsulated transmission grism with high diffraction efficiency and low polarization", Proc. SPIE 12765, Optical Design and Testing XIII, 127650W (28 November 2023); https://doi.org/10.1117/12.2689070

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KEYWORDS

Diffraction gratings

Diffraction

Optical gratings

Dielectric polarization

Polarization gratings

Design and modelling

Polarization

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