Near-field tuning of optomechanical coupling in a split-beam nanocavity

TL;DR

This paper demonstrates how tunable evanescent coupling via an optical fiber taper can reconfigure and enhance optomechanical interactions in a split-beam nanocavity, enabling mode-specific and regime-tunable control.

Contribution

It introduces a method to dynamically control and enhance optomechanical coupling in nanocavities using a fiber taper probe for reconfigurable interactions.

Findings

Enhanced optomechanical coupling through fiber taper positioning

Ability to select specific mechanical modes for coupling

Tuning between dissipative and dispersive regimes

Abstract

Tunable evanescent coupling is used to modify the optomechanical interactions within a split-beam photonic crystal nanocavity. An optical fiber taper probe is used to renormalize the optical nanocavity field and introduce a dissipative optomechanical coupling channel, reconfiguring and enhancing coupling between the optical and mechanical resonances of the device. Positioning of the fiber taper allows preferential coupling to specific mechanical modes and provides a mechanism for tuning the optomechanical interaction between dissipative and dispersive coupling regimes.