Effects of linear and quadratic dispersive couplings on optical squeezing in an optomechanical system

TL;DR

This paper investigates how quadratic optomechanical coupling influences optical squeezing in a system with linear coupling, revealing that QOC can enhance squeezing at lower powers and higher temperatures, with an optimal QOC value for maximum effect.

Contribution

It introduces the impact of quadratic coupling on optical squeezing in optomechanical systems, showing potential for improved squeezing performance over traditional models.

Findings

Strong squeezing achievable with QOC and LOC at lower pump powers

Maximum squeezing occurs at an optimal QOC value

Enhanced squeezing at higher bath temperatures

Abstract

A conventional optomechanical system is composed of a mechanical mode and an optical mode interacting through a linear optomechanical coupling (LOC). We study how the presence of quadratic optomechanical coupling (QOC) in the conventional optomechanical system affects the system's stability and optical quadrature squeezing. We work in the resolved side-band limit with a high quality factor mechanical oscillator. In contrast to the conventional optomechanical systems, we find that strong squeezing of the cavity field can be achieved in presence of QOC along with LOC at lower pump powers and at higher bath temperatures. Using detailed numerical calculations we also find that there exists an optimal QOC where one can achieve maximum squeezing.