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Conference on Lasers and Electro-Optics

Rigorous analysis of bistable memory in silica toroid micro-cavity

Wataru Yoshiki, Takasumi Tanabe

Published Jan 1, 2012• 0 citations
Publisher

Abstract

We modeled nonlinear behavior in a silica toroid microcavity using coupling mode theory and the finite element method, and obtained Kerr bistability that did not suffer from the thermo-optic effect by optimizing the fiber-cavity coupling.
DOI
10.1364/cleo_si.2012.cm2m.8

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The shift of optical cavity modes oscillates due to the time-varying refractive index under Kerr nonlinearity. To reveal its impact on bistability, we present a time-average approach that includes this dynamic shift characteristic in the expression of nonlinear transmission. It predicts the monotonous decrease of the maximum transmission with the increase of the frequency detuning. Also, the frequency detuning to start bistability should be corrected as about 2. Our analyses are supported by the simulations based on the finite-difference time-domain technique.
Optical bistable responses in AlGaAs-based photonic crystal cavities with Al fractions of 0.16 and 0.27 under a stationary condition are studied. An analysis of the experimental results with a one-dimensional etalon model indicates that the bistable response is primarily driven by optical nonlinearities that stem from a heat generation in two-photon absorption and in free-carrier absorption. A free-carrier plasma effect is not influential, which is a major difference from the case of Si photonic crystal cavities. The accumulation of heat enables the phase or index to significantly change. An estimate indicates that a highQQQ-factor is advantageous for driving bistability exclusively by the Kerr effect.