Optomechanics based on angular momentum exchange between light and matter

TL;DR

This paper reviews optomechanical systems that utilize angular momentum exchange between light and matter, highlighting theoretical proposals, experimental realizations, and future research directions in this emerging field.

Contribution

It introduces optomechanical interactions based on angular momentum transfer, expanding beyond traditional linear momentum approaches, and provides analysis and insights for both theorists and experimentalists.

Findings

Analysis of existing theoretical proposals

Descriptions of experimental implementations

Suggestions for future research directions

Abstract

The subject of optomechanics involves interactions between optical and mechanical degrees of freedom, and is currently of great interest as an enabler of fundamental investigations in quantum mechanics, as well as a platform for ultrasensitive measurement devices. The majority of optomechanical configurations rely on the exchange of linear momentum between light and matter. We will begin this tutorial with a brief description of such systems. Subsequently, we will introduce optomechanical systems based on angular momentum exchange. In this context, optical fields carrying polarization and orbital angular momentum will be considered, while for the mechanics, torsional and free rotational motion will be of relevance. Our overall aims will be to supply basic analyses of some of the existing theoretical proposals, to provide functional descriptions of some of the experiments conducted thus far, and to consider some directions for future research. We hope this tutorial will be useful to both theorists and experimentalists interested in the subject.