# Modelling and optimization of the excitonic diffraction grating

## TL;DR

This paper presents a theoretical model for excitonic diffraction gratings in quantum wells, enabling better understanding and optimization of their directional optical response based on experimental data and predictive analysis.

## Contribution

The paper introduces a step-by-step Maxwell equation-based model for excitonic diffraction, providing a reliable tool for describing experiments and enhancing diffraction efficiency.

## Key findings

- The model accurately describes experimental diffraction data.
- It predicts methods to increase diffraction efficiency.
- The approach advances understanding of excitonic resonant diffraction.

## Abstract

Periodical spatial modulation of the excitonic resonance in a quantum well could lead to the formation of a new highly directional and resonant coherent optical response -- resonant diffraction. Such excitonic diffraction gratings were demonstrated in epitaxially grown quantum wells patterned by the low-dose ion beam irradiation before or after the growth. In this paper we present a theoretical model of the resonant diffraction formation based on the step-by-step approximation of the Maxwell equation solution. The resulting theory allows us to reliably describe experimental data, as well as to predict the way to increase the diffraction efficiency.