Thickness optimization algorithm to improve multilayer diffractive optical elements performance

Journal article (2023)

Authors

Victor Laborde Université de Liège
Jérôme Loicq Université de Liège, Spaceborne Instrumentation - Aerospace Engineering
Juriy Hastanin Université de Liège
Serge Habraken Université de Liège
Research Group
Spaceborne Instrumentation (Aerospace Engineering) (TU Delft)
Copyright: © 2023 Victor Laborde, J.J.D. Loicq, Juriy Hastanin, Serge Habraken
DOI: https://doi.org/10.1364/AO.474107
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Published Date

2023

Language

English

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Faculty

Aerospace Engineering

Department

Space Engineering

Research Group

Spaceborne Instrumentation

Abstract

The diffractive zone thicknesses of conventional diffractive optical elements (DOEs) are generally obtained using the thin element approximation (TEA). However, the TEA yields inaccurate results in the case of thick multilayer DOEs (MLDOEs). The extended scalar theory (EST) is an alternative thickness optimization method that depends on the diffractive order and the optimization wavelength. We developed an algorithm to research suitable EST input parameters. It combines ray-tracing and Fourier optics to provide a performance estimate for each EST parameter pair. The resulting “best”MLDOEdesigns for three different material combinations are analyzed using rigorous finite-difference time-domain. Compared to the TEA, the proposed algorithm can provide performing zone thicknesses.

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