Superradiant droplet emission from parametrically excited cavities

TL;DR

This paper demonstrates a hydrodynamic analog of optical superradiance, showing that coupled vibrational cavities emit droplets at an enhanced rate, with emission depending sinusoidally on cavity separation.

Contribution

It introduces a hydrodynamic system that mimics superradiance, revealing cooperative droplet emission in coupled vibrational cavities, a novel analogy to optical superradiance.

Findings

Coupled cavities emit droplets at a higher rate than isolated ones.

Emission rate varies sinusoidally with cavity separation.

Hydrodynamic superradiance mimics optical phenomena.

Abstract

Superradiance occurs when a collection of atoms exhibits cooperative, spontaneous emission of photons at a rate that exceeds that of its component parts. Here, we reveal a similar phenomenon in a hydrodynamic system consisting of a pair of vibrationally-excited cavities, coupled through their common wavefield, that spontaneously emit droplets via interfacial fracture. We show that the droplet emission rate of two coupled cavities is higher than the emission rate of two isolated cavities. We further show that the amplified emission rate varies sinusoidally with distance between the cavities, thus demonstrating a hydrodynamic phenomenon that captures the essential features of superradiance in optical systems.