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Multilayer diffractive optical element material selection method based on transmission, total internal reflection,

Victor Laborde, Jérôme Loicq, Juriy Hastanin

|October 18, 2022

Summary

A new geometric optics material selection method (GO-MSM) offers accurate material selection for thick diffractive optical elements, outperforming traditional PIDE metrics. This ensures high-performance multilayer diffractive optical element designs, especially in infrared bands.

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Area of Science:

Optical Engineering
Materials Science

Background:

Traditional polychromatic integral diffraction efficiency (PIDE) is used for multilayer diffractive optical element (MLDOE) material selection.
PIDE relies on the thin element approximation, leading to inaccuracies for thick MLDOEs.

Purpose of the Study:

To introduce a novel material selection method for MLDOEs that accounts for element thickness.
To evaluate the performance of MLDOEs designed with the new method compared to PIDE-selected designs.

Main Methods:

Developed the geometric optics material selection method (GO-MSM) using transmission, total internal reflection, and component thickness.
Utilized finite-difference time-domain simulations to assess optical performance (Strehl ratio).
Tested the methods in mid-wave and long-wave infrared spectral bands.

Main Results:

The GO-MSM successfully identified MLDOE designs with optimal performance.
MLDOEs designed using PIDE showed poor performance, especially for thick elements.
Filling MLDOE gaps with low-index materials like air significantly degrades image quality.

Conclusions:

The GO-MSM is a more accurate approach for selecting materials for thick MLDOEs.
Accurate material selection is crucial for achieving high-performance diffractive optical elements.
Understanding material interactions within MLDOE structures is vital for optical design.