Quantum optomechanics of a multimode system coupled via photothermal and radiation pressure force

TL;DR

This paper presents a comprehensive quantum analysis of a multimode optomechanical system involving a Fabry-Perot cavity with a movable mirror, exploring cooling and entanglement effects driven by radiation pressure and photothermal forces.

Contribution

It provides a full quantum model of a multimode optomechanical system with coupled elastic and center-of-mass modes, including their cooling and entanglement properties.

Findings

Simultaneous cooling of elastic and center-of-mass modes achieved.

Steady-state entanglement observed among the modes.

Quantum Langevin approach effectively describes the system dynamics.

Abstract

We provide a full quantum description of the optomechanical system formed by a Fabry-Perot cavity with a movable micro-mechanical mirror whose center-of-mass and internal elastic modes are coupled to the driven cavity mode by both radiation pressure and photothermal force. Adopting a quantum Langevin description, we investigate simultaneous cooling of the micromirror elastic and center-of-mass modes, and also the entanglement properties of the optomechanical multipartite system in its steady state.