Odd-symmetry phase gratings produce optical nulls uniquely insensitive to wavelength and depth

TL;DR

This paper introduces odd-symmetry phase gratings that generate optical nulls highly resistant to changes in wavelength and depth, enhancing robustness in optical applications.

Contribution

The paper presents a novel class of diffractive optical elements, odd-symmetry phase gratings, with unique wavelength- and depth-insensitive nulls in their diffraction patterns.

Findings

Optical nulls are robust to wavelength variations.

Nulls are insensitive to depth changes.

Enhanced stability in optical systems using these gratings.

Abstract

I present the analysis of a new class of diffractive optical element, the odd-symmetry phase grating, which creates wavelength- and depth-robust features in its near-field diffraction pattern.