Purcell effect in small metallic cavities

TL;DR

This paper theoretically investigates how the Purcell effect influences emission rates of dipoles in small metallic cavities, revealing that the Purcell factor varies significantly with cavity size and skin depth.

Contribution

It provides a detailed analysis of the Purcell effect in small metallic cavities, highlighting the dependence on cavity size relative to skin depth, which was not thoroughly explored before.

Findings

Purcell factor varies widely with cavity size and skin depth.

Small metallic cavities significantly alter emission rates.

Theoretical analysis of dipole emission in metallic environments.

Abstract

We have studied theoretically the Purcell factor which characterizes a change in the emission rate of an electric or magnetic dipole embedded in the center of a spherical cavity. The main attention is paid to the analysis of cavities with radii small compared to the wavelength. It is shown that the Purcell factor in small metallic cavities varies in a wide range depending on the ratio of the cavity size to the skin depth.