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Bandaoti guangdian

Bistability of Nonlinear Fabry-Perot Cavity

Song Jun

Published Jan 1, 2000• 0 citations
OpenAlex

Abstract

The bistability of vertical microcavity MQW structure is studied using transfer matrix method.Calculation results show that it is much easier to produce bistable states when the material with higher refractive index is in the vicinity of the nonlinear dielectric (i.e.MQW structure).Curves of the reflective phase and reflectivity varying with the incident optical power of nonlinear Fabry-Perot cavity are also calculated.The effect of the number of the DBR periods on the bistability is analyzed.

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The bistability of vertical microcavity MQW structure is studied using transfer matrix method.Calculation results show that it is much easier to produce bistable states when the material with higher refractive index is in the vicinity of the nonlinear dielectric (i.e.MQW structure).Curves of the reflective phase and reflectivity varying with the incident optical power of nonlinear Fabry-Perot cavity are also calculated.The effect of the number of the DBR periods on the bistability is analyzed.
Based on Fabry-Perot cavity's theories and efficiency refractive index,the optical bistability of a nonlinear microcavity is studied,and the corresponding mathematical formula are deduced.The theoretical curves are well fitted with those of numerical simulation in other papers.The investigation shows that appropriate frequency-shifting should be preset on the incident light in order to produce bistability for a nonlinear system.If the system is composed of focusing nonlinear medium,the frequency must be redshifted, otherwise it must be blue-shifted.The magnitude of critical shifting is 0.866 times of the width of microcavity resonance mode.
We propose a mechanism for achieving optical bistability in semiconductor heterostructures. In contrast to the well-known refractive shift of the Fabry-Perot mode in macroscopic resonators, we consider the bleaching of the exciton Rabi splitting in strong-coupling microcavities and prove that this nonlinear process leads to an optically bistable behavior. Through a model based on the transfer-matrix formalism, we predict the dependence of this effect on specific material parameters and on the nature of the cavity. Numerical calculations are carried out for quantum well embedded cavities and the possibility of room-temperature bistable operation is also discussed. \textcopyright{} 1996 The American Physical Society.
Optical bistability can be obtained in nonlinear materials either with Fabry-Perot mirrors or without external feedback. When a material is placed between partially reflecting mirrors, a nonlinear Fabry-Perot etalon is formed with the etalon providing an external feedback. Optical bistability and gating occur as a result of a shift in the Fabry-Perot peak when the light intensity is increased (or when a second laser beam is introduced into the cavity). Optical bistability with the external feedback mechanism has been observed in many semiconductors such as bulk GaAs, GaAs-AIGaAs multiple-quantum-well (MQW) structures, InSb, InAs, CdS, CdHgTe, GaSe, and CuCI.
A theoretical demonstration of optical bistability in periodic layered media, particularly in long-period GaAs/AlAs superlattices is presented. The proposed structure consists of a periodic multilayer system, as opposed to previously demonstrated nonlinear bistable devices which employed Fabry-Perot etalons. The optical resonance effect which is essential for bistable devices is, in this case, induced by a refractive index modulation. The nonlinear active medium is distributed in the whole structure rather than placed between the two mirrors of a Fabry-Perot cavity. It is shown by a complete calculation of wave propagation in the periodic nonlinear medium that a multiple valued feature appears in the structure's nonlinear reflectivity spectrum. The input/output characteristics of the structure exhibit bistable hysteresis similar to that of a nonlinear Fabry-Perot etalon.>
Optical Kerr nonlinearity is central to optical bistability in high-Q microcavities. Here, we show that optical Kerr nonlinearities in Fabry Perot resonators can also result in self-focusing effects, that can substantially modify the Q-factors of the resonators. For the studied cavities, up to five-fold increase in Q-factors is predicted, attributed to reduction of sidewall leakage, confirmed via simulations performed on curved cavities. We also show that for high Q-factor cavities, the higher-order Kerr effect can become relevant already at modest input intensities scaling inversely with Q-factor for a particular n2/n4 ratio. We investigate numerically the role of higher-order Kerr effect on optical bistability responses and find that its inclusion can shift the bistability threshold to higher input intensities than predicted by the standard n2-only model.