# Identifying orbital angular momentum of light in quantum wells

## TL;DR

This paper proposes a quantum optical scheme using GaAs/AlGaAs quantum wells to identify the orbital angular momentum of Laguerre-Gaussian light beams by analyzing absorption profiles influenced by quantum interference.

## Contribution

It introduces a novel method to determine the orbital angular momentum of structured light using quantum interference effects in semiconductor quantum wells.

## Key findings

- Absorption depends on the azimuthal phase of vortex beams.
- Both magnitude and sign of the azimuthal index are detectable.
- The scheme enables mapping of orbital angular momentum into absorption profiles.

## Abstract

Generation and detection of structured light have recently been the subject of intense study, aiming to realize high-capacity optical storage and continuous-variable quantum technologies. Here, we present a scheme to extract the orbital angular momentum content of Laguerre-Gaussian light beams in a double-$\Lambda$ four level system of GaAs/AlGaAs multiple quantum wells. Arising from a quantum interference term, absorption of a non-vortex probe field depends upon the azimuthal phase of vortex fields so that both magnitude and sign of the azimuthal index/indices can be mapped into the absorption profile.