Thermo-optical dynamics of a nonlinear GaInP photonic crystal nanocavity depend on the optical mode profile

Karindra Perrier*, Sebastiaan Greveling, Hilbrand Wouters, Said R.K. Rodriguez, Gaëlle Lehoucq, Sylvain Combrié, Alfredo D.E. Rossi, Sanli Faez, Allard P. Mosk

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We measure the dynamics of the thermo-optical nonlinearity of both a mode-gap nanocavity and a delocalized mode in a Ga0.51In0.49P photonic crystal membrane. We model these results in terms of heat transport and thermo-optical response in the material. By step-modulating the optical input power we push the nonlinear resonance to jump between stable branches of its response curve, causing bistable switching. An overshoot of the intensity followed by a relaxation tail is observed upon bistable switching. In this way, the thermal relaxation of both the localized resonance and the delocalized resonance is measured. Significant difference in decay time is observed and related to the optical mode profile of the resonance. We reproduce the observed transient behavior with our thermo-optical model, implementing a non-instantaneous nonlinearity, and taking into account the optical mode profile of the resonance, as experimentally measured.

Original languageEnglish
Pages (from-to)1879-1890
Number of pages12
JournalOSA Continuum
Volume3
Issue number7
DOIs
Publication statusPublished - 15 Jul 2020

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