Microcavity-based Generation of Full Poincar\'{e} Beams with Arbitrary Skyrmion Numbers

TL;DR

This paper introduces a novel method to generate full Poincaré beams with arbitrary skyrmion numbers using a microring cavity, enabling compact sources of complex optical spin fields.

Contribution

It proposes a new generation scheme for full Poincaré beams based on an integrated microring cavity with angular gratings, advancing beyond bulk optics methods.

Findings

Successfully simulated generation of FP beams with tailored skyrmion numbers

Demonstrated control over optical spin and orbital angular momenta

Showed potential for compact, integrated light sources with complex spin fields

Abstract

A full Poincar\'e (FP) beam possesses all possible optical spin states in its cross-section, which constitutes an optical analogue of a skyrmion. Until now, FP beams have been exclusively generated using bulk optics. Here, we propose a generation scheme of an FP beam based on an optical microring cavity. We position two different angular gratings along with chiral lines on a microring cavity and generate an FP beam as a superposition of two light beams with controlled spin and orbital angular momenta. We numerically show that FP beams with tailored skyrmion numbers can be generated from this device, opening a route for developing compact light sources with unique optical spin fields.