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INCREASING ABSORPTION OPTICAL BISTABILITY FOR ZnSe THIN FILM

Xiqin Zhang

Published Jan 1, 1998• 0 citations
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Abstract

In the paper, we have obtained nonlinear absorption coefficient and nonlinear refractive index as a function using transmission spectra for ZnSe thin film. And observed increasing absorption optical bistablity using nanosecond pulsed laser in ZnSe thin film at 77K. The results indicate that the major excitonic nonlinear mechanism is due to Coulomb screening of the excitonic state.

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Acta Physica Sinica•Jan 1, 1992•1 citation
In the paper, we have obtained nonlinear absorption coefficient and nonlinear refractive index as a function using transmission spectra for ZnSe thin film. And observed increasing absorption optical bistablity using nanosecond pulsed laser in ZnSe thin film at 77K. The results indicate that the major excitonic nonlinear mechanism is due to Coulomb screening of the excitonic state.
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The excitonic nonlinear refractive index was calculated by using Kramers-Kronig relation and the saturating absorption of ZnSe/CdZnSe multiple quantum wells (MQWs) was studied under different pump intensities. The maximum nonlinear refractive index change is about -6.19 X 10-3. Excitonic optical bistability in ZnSe/CdZnSe MQWs is investigated at room temperature. The result indicates that the threshold and contrast ratio for the optical bistability in ZnSe/CdZnSe MQWs are about 210Kw/cm2 and 2:1, respectively. On the basis of the excitonic nonlinear theories and excitonic absorption spectra in the ZnSe/CdZnSe MQWs, we attribute the major nonlinear mechanism of the optical bistability in the ZnSe/CdZnSe MQWs to the phase space filling of excitonic states and excitonic band broadening due to exciton-exciton interactions.
Excitonic optical bistability with nanosecond switching time in ZnSe-ZnS multiple quantum wells (MQWs) with a Fabry-Perot (FP) cavity is investigated at room temperature. The research result indicates that the threshold and contrast ratio for the optical bistability in ZnSe-ZnS MQWs with a FP cavity are about 0.2 MW/cm2 and 6:1, respectively. On the basis of the room temperature excitonic absorption spectra obtained here, we attribute the major nonlinear mechanism for the optical bistability to the excitonic saturating absorption due to phase space filling of excitonic states and excitonic band broadening.
The free exciton emission and optical nonlinearity in ZnSe-ZnS grown by MOCVD on CaF 2 substrates have been studied under different excitation densities at 77 K. We report the first observation of the new emission band due to Ex − Ex interaction, exciton saturating absorption and exciton optical bistability in ZnSe-ZnS/CaF 2 superlattices. The dominant exciton optical nonlinear mechanism for ZnSe-ZnS/CaF 2 superlattices under high excitation density is the combination of phase-space filling of exciton state and exciton band broadening