Arbitrary vector beam generation in semiconductor quantum dots

TL;DR

This paper presents a scheme for generating arbitrary vector beams using semiconductor quantum dots, leveraging nonlinear optical interactions and control fields, with analysis of polarization and temperature effects.

Contribution

It introduces a novel method for vector beam generation in quantum dots using four-wave mixing and control fields, considering phonon interactions and polarization control.

Findings

Successful generation of vector beams with controllable polarization.

Demonstration of polarization rotation by phase adjustment.

Analysis of temperature effects on beam quality.

Abstract

We have proposed an arbitrary vector beam (VB) generation scheme in a thin disk-shaped quantum dot (QD) medium considering phonon interaction. The QD biexciton system exhibits interplay between first and third-order nonlinear susceptibility between two orthogonal circular polarisation transitions. Three QD transitions are coupled with one applied weak and two strong control orbital angular momentum (OAM) carrying fields. Therefore, the applied field experiences absorption, and a new field with the desired OAM is generated via four-wave mixing (FWM). These two orthogonal field superpositions produce VB at the QD medium end. We have also demonstrated the polarization rotation of a VB by changing only the relative control field phase. Additionally, we have analyzed the effect of temperature on the VB generation.