Saturating refractive nonlinearities and optical bistability in ZnSe/CdZnSe MQWs at room temperature

Hongyu Li; De Zen Shen; Jiying Zhang; Shumei Wang; Baojun Yang; Guangyou Yu

doi:10.1117/12.318110

17 August 1998 Saturating refractive nonlinearities and optical bistability in ZnSe/CdZnSe MQWs at room temperature

Hongyu Li, De Zen Shen, Jiying Zhang, Shumei Wang, Baojun Yang, Guangyou Yu

Proceedings Volume 3554, Photorefractive Materials: Phenomena and Related Applications II; (1998) https://doi.org/10.1117/12.318110
Event: Photonics China '98, 1998, Beijing, China

Abstract

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.

Citation Download Citation

Hongyu Li, De Zen Shen, Jiying Zhang, Shumei Wang, Baojun Yang, and Guangyou Yu "Saturating refractive nonlinearities and optical bistability in ZnSe/CdZnSe MQWs at room temperature", Proc. SPIE 3554, Photorefractive Materials: Phenomena and Related Applications II, (17 August 1998); https://doi.org/10.1117/12.318110

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