Quasinormal-mode perturbation theory for dissipative and dispersive optomechanics

TL;DR

This paper develops a quasinormal-mode perturbation theory to accurately predict dispersive and dissipative optomechanical couplings, validated through simulations, experiments, and application to plasmonic systems with strong dissipative effects.

Contribution

It introduces a formalism that captures non-Hermiticity in optomechanical systems, enabling analysis of dissipative and dispersive couplings in a unified framework.

Findings

The model accurately predicts optomechanical couplings.

Validation through simulations and experimental data.

Application to plasmonic systems reveals strong dissipative effects.

Abstract

Despite the several novel features arising from the dissipative optomechanical coupling, such effect remains vastly unexplored due to the lack of a simple formalism that captures non-Hermiticity in optomechanical systems. In this Letter, we show that quasinormal-mode-based perturbation theory is capable of correctly predicting both dispersive and dissipative optomechanical couplings. We validate our model through simulations and also by comparison with experimental results reported in the literature. Finally, we apply this formalism to plasmonic systems, used for molecular optomechanics, where strong dissipative coupling signatures in the amplification of vibrational modes are observed.