Far off-Bragg reconstruction of volume holographic gratings: A comparison of experiment and theories

TL;DR

This study compares experimental light diffraction data of nanoparticle-polymer volume holographic gratings with three diffraction theories, highlighting the superior accuracy of dynamical and beta-value methods over the K-vector closure approach.

Contribution

It provides a systematic comparison of diffraction theories against experimental data in far off-Bragg conditions, identifying the most accurate models.

Findings

Dynamical theory and beta-value method fit experimental data well.

K-vector closure method shows poor fit with higher error.

Results improve accuracy in determining coupling strength and grating thickness.

Abstract

We performed light optical diffraction experiments on a nanoparticle-polymer volume holographic grating in an angular range including also far off-Bragg replay. A comparison of three diffraction theories - on the same level of complexity - with our experimental results shows that the dynamical theory of diffraction and the first-order two-wave coupling theory using the beta-value method fit the data very well. In contrast, the prevalent two-wave coupling theory using the K-vector closure method yields a poor fit with an order of magnitude worse mean squared error. These findings must be considered for accurate determination of coupling strength and grating thickness.