Spin dissymmetry in optical cavities

TL;DR

This paper introduces a new measure called the spin dissymmetry factor to quantify spin-selectivity in optical transitions, demonstrating a metasurface cavity design that maximizes this effect for quantum emitters.

Contribution

The paper proposes the spin dissymmetry factor as a local measure of spin-selectivity and designs a metasurface cavity that enhances spin-dependent radiative coupling.

Findings

Maximized spin dissymmetry in a three-fold symmetric metasurface cavity.

Enhanced spin or chirality responses in near-field and far-field regimes.

Provides a compact parameter for designing efficient quantum optical devices.

Abstract

We introduce the spin dissymmetry factor, a measure of the spin-selectivity in the optical transition rate of quantum particles. This spin dissymmetry factor is valid locally, including at material interfaces and within optical cavities. We design and numerically demonstrate a metasurface optical cavity with three-fold rotational symmetry that maximizes spin dissymmetry, thereby maximizing the spin-selective radiative coupling of a cavity-coupled emitter. We also show the near-field and far-field response of spin and chiral dipoles to these cavities that preferentially enhance either spin or chirality. Our approach emphasizes the difference between spin and chirality in the near-field and reveals a compact parameter for designing more efficient quantum optical devices.