Dynamic Brillouin cooling for continuous optomechanical systems

TL;DR

This paper demonstrates a novel method for ground state cooling in continuous optomechanical systems using backward Brillouin scattering with dynamic modulation, overcoming traditional dissipation constraints.

Contribution

It introduces a dynamic modulation scheme for Brillouin cooling that surpasses steady-state limits and applies to both backward and forward scattering in waveguides.

Findings

Achieves ground state cooling with mechanical dissipation exceeding optical dissipation.

Uses pulsed pump modulation to suppress heating in strong coupling regime.

Realizes cooling factors several orders of magnitude beyond steady-state limits.

Abstract

In general, ground state cooling using optomechanical interaction is realized in the regime where optical dissipation is higher than mechanical dissipation. Here, we demonstrate that optomechanical ground state cooling in a continuous optomechanical system is possible by using backward Brillouin scattering while mechanical dissipation exceeds optical dissipation which is the common case in optical waveguides. The cooling is achieved in an anti-Stokes backward Brillouin process by modulating the intensity of the optomechanical coupling via a pulsed pump to suppress heating processes in the strong coupling regime. With such dynamic modulation, a cooling factor with several orders of magnitude can be realized, which breaks the steady-state cooling limit. This modulation scheme can also be applied to Brillouin cooling generated by forward intermodal Brillouin scattering.