Dynamic release of trapped light from an ultrahigh-Q nanocavity via adiabatic frequency tuning

TL;DR

This paper demonstrates adiabatic frequency shifting in an ultrahigh-Q nanocavity, enabling dynamic release of trapped light and short pulse generation through simple Q tuning.

Contribution

It introduces a method for dynamically tuning the Q factor of a nanocavity to control light release via adiabatic frequency shifting.

Findings

Confirmed the frequency follows cavity resonance during tuning

Achieved dynamic release of trapped light as a short pulse

Demonstrated simple Q tuning for light control

Abstract

Adiabatic frequency shifting is demonstrated by tuning an ultrahigh-Q photonic crystal nanocavity dynamically. By resolving the output temporally and spectrally, we showed that the frequency of the light in the cavity follows the cavity resonance shift and remains in a single mode throughout the process. This confirmed unambiguously that the frequency shift results from the adiabatic tuning. We have employed this process to achieve the dynamic release of a trapped light from an ultrahigh-Q cavity and thus generate a short pulse. This approach provides a simple way of tuning Q dynamically.