Role of Optical Density of States in Two-mode Optomechanical Cooling

TL;DR

This paper investigates how dual optical densities of states influence optomechanical cooling, demonstrating near-strong coupling at room temperature and highlighting deviations caused by thermal locking effects.

Contribution

It provides the first experimental analysis of dual optical densities in two-mode optomechanical cooling and explores deviations from theoretical predictions due to thermal locking.

Findings

Enhanced cooling rates via dual optical modes

Near-strong coupling regime achieved at room temperature

Thermal locking causes deviations from ideal theory

Abstract

Dynamical back-action cooling of phonons in optomechanical systems having one optical mode is well studied. Systems with two optical modes have the potential to reach significantly higher cooling rate through resonant enhancement of both pump and scattered light. Here we experimentally investigate the role of dual optical densities of states on optomechanical cooling, and the deviation from theory caused by thermal locking to the pump laser. Using this, we demonstrate a room temperature system operating very close to the strong coupling regime, where saturation of cooling is anticipated.