Optomechanical non-reciprocity and its equivalence to antiresonance: Control of isolation frequency using mechanical drive

TL;DR

This paper reveals that optomechanical non-reciprocity is equivalent to anti-resonance and demonstrates how to dynamically control the isolation frequency using mechanical drive, enabling tunable non-reciprocal behavior in optomechanical systems.

Contribution

It introduces a method to control the isolation frequency in optomechanical non-reciprocity by applying a mechanical drive, expanding the tunability of non-reciprocal devices.

Findings

Non-reciprocity is equivalent to anti-resonance in optomechanical systems.

Phase difference in cavity driving fields induces non-reciprocity and anti-resonance.

Mechanical drive allows dynamic tuning of the isolation frequency.

Abstract

We demonstrate that optomechanical non-reciprocity is equivalent to the anti-resonance, often discussed in the context of coupled driven harmonic oscillators. We show that that suitable phase-difference between the cavity driving fields make the relevant optomechanical couplings complex, which leads to non-reciprocity in the field fluctuations and anti-resonance in average field amplitudes. This analogy with anti-resonance demonstrates that only for a particular frequency (the so-called isolation frequency) of input signal, maximum non-reciprocity can be achieved. In contrast to the previous studies, we here show that one can dynamically control this isolation frequency by applying a mechanical drive of suitable frequency to the membrane in the optomechanical setup.