Quantum squeezing induced nonreciprocal phonon laser

TL;DR

This paper proposes a method to achieve nonreciprocal phonon lasing using optomechanical and nonlinear optical resonators, enabling directional acoustic amplification with potential applications in sensing and phononic networks.

Contribution

It introduces a novel approach to induce nonreciprocal phonon lasing through optical squeezing in a coupled resonator system, which is tunable and feasible with various nonlinear media.

Findings

Directional optical squeezing occurs along the pump direction.

Achieves tunable nonreciprocal phonon lasing with a controllable power threshold.

Potential applications in acoustic sensing and phononic information processing.

Abstract

Phonon lasers or coherent amplifications of mechanical oscillations have provided powerful tools for both fundamental studies of coherent acoustics and diverse applications ranging from ultrasensitive force sensing to phononic information processing. Here, we propose how to achieve directional phonon lasing with an optomechanical resonator coupled to a nonlinear optical resonator. We find that, by pumping the nonlinear resonator, directional optical squeezing can occur along the pump direction. As a result, we can achieve the directional mechanical gain by utilizing the directional optical squeezing, thus leading to nonreciprocal phonon lasing with a well-tunable directional power threshold. Our work shows a feasible way to build nonreciprocal phonon lasers with various nonlinear optical mediums, which are important for such a wide range of applications as directional acoustic amplifiers, invisible sound sensing or imaging, and one-way phononic networks.