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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Cavity lifetime control by slow-light and nonlinear effects

P. Grinberg, Philippe Hamel, Maia Brunstein, Kamel Bencheikh, Alejandro M. Giacomotti, Ariel Levenson, Yannick Dumeige

Published Mar 6, 2013• 0 citations
Publisher

Abstract

We show both theoretically and experimentally that the lifetime of an active semiconductor photonic crystal nanocavity is enhanced thanks to the combination of two cooperative effects: slow light propagation based on coherent-population-oscillation effect and optical bistability. In particular we develop an analytical analysis enabling us to clearly show the physical mechanisms producing the enhancement of the cavity lifetime.

DOI
10.1117/12.2009986

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We show both theoretically and experimentally that the lifetime of an active semiconductor photonic crystal nanocavity is enhanced thanks to the combination of two cooperative effects: slow light propagation based on coherent-population-oscillation effect and optical bistability. In particular we develop an analytical analysis enabling us to clearly show the physical mechanisms producing the enhancement of the cavity lifetime.
Summary form only given. We implement coherent population oscillation and carrier-induced nonlinear refractive index in a semiconductor active nanocavity to strongly increase the photonic lifetime and manipulate its optical response.The so-called photonic crystal L3 cavity, given by three missing holes in a 2D photonic crystal (2D-PhC), is an emblematic illustration of a nanocavity with strong light confinement due to high-Q resonance and small mode volume [1]. Strong electronic confinement can also be achieved provided the cavity contains active semiconductor nanostructures such as quantum wells (QWs) or dots. These two effects lead to the enhancement of the light-matter interaction and, potentially, to a modification of photonic, electronic and thermal characteristic times. Thus, semiconductor 2D-PhC L3 nanocavities are excellent candidates for the implementation of advanced nonlinear photonic interactions. In this work we study the combined effects of both coherent population oscillation (CPO) and carrier-induced nonlinear dephasing in the photon lifetime of a L3 cavity incorporating 4 InGaAsP/InGaAs QWs. The CPO induces a decrease of the group velocity through a strong dispersion of the refractive index (i.e. slow light effect) while the nonlinear phase shift, if implemented close to the bistability threshold, ends up with a strong slowing down of the optical response. The resulting cavity lifetime strongly depends on the control parameters. It is then possible to actively control the photon lifetime of the nanocavity, to enhance its quality factor, to achieve differential amplification under the slow-light regime and to benefit from frequency pulling During this presentation we will discuss theoretically [1] all these aspects with respect to the role of CPO and dynamical nonlinear responses. We will further present recent experimental results [2] demonstrating the enhancement by two orders of magnitude of the cavity lifetime together with the frequency pulling effect.Γ