Optomechanical photon shuttling between photonic cavities

TL;DR

This paper introduces a novel multi-cavity optomechanical device called the 'photon see-saw' that uses torsional motion to transfer photons between two photonic crystal nanocavities, demonstrating a new nonlocal optomechanical effect.

Contribution

The work presents the first demonstration of a photon shuttling mechanism between separated cavities driven by torsional optomechanical motion.

Findings

Photon transfer occurs during each oscillation cycle.

Resonance frequencies are modulated anti-symmetrically.

Optomechanical self-oscillation enables controlled photon shuttling.

Abstract

Mechanical motion of photonic devices driven by optical forces provides a profound means of coupling between optical fields. The current focus of these optomechanical effects has been on cavity optomechanics systems in which co-localized optical and mechanical modes interact strongly to enable wave-mixing between photons and phonons and backaction cooling of mechanical modes. Alternatively, extended mechanical modes can also induce strong nonlocal effects on propagating optical fields or multiple localized optical modes at distances. Here, we demonstrate a novel multi-cavity optomechanical device: a "photon see-saw", in which torsional optomechanical motion can shuttle photons between two photonic crystal nanocavities. The resonance frequencies of the two cavities, one on each side of the see-saw, are modulated anti-symmetrically by the device's rotation. Pumping photons into one cavity excites optomechanical self-oscillation which strongly modulates the inter-cavity coupling and shuttles photons to the other empty cavity during every oscillation cycle in a well regulated fashion.