Excitonic Optical Nonlinearities In ZnSe Epitaxial Films

J E Potts; H Cheng; S H Park; B Fluegel; M Joffre; S W Koch; N Peyghambarian

doi:10.1117/12.944069

3 May 1988 Excitonic Optical Nonlinearities In ZnSe Epitaxial Films

J E Potts, H Cheng, S H Park, B Fluegel, M Joffre, S W Koch, N Peyghambarian

Proceedings Volume 0881, Optical Computing and Nonlinear Materials; (1988) https://doi.org/10.1117/12.944069
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

Excitonic optical nonlinearities in epitaxial ZnSe thin films have been measured at 150 and 300K. The measured nonlinear response, An/N = 1.8X10-19 cm3 at 300K, is comparable to that observed in bulk GaAs and GaAs/AlGaAs multiple quantum well systems. Analysis of these results using our partly-phenomenological plasma theory indicates that the mechanisms responsible for this nonlinearity at room temperature are exciton screening and density-dependent broadening. At 150K, exciton screening makes the major contribution to the nonlinearity. Using femtosecond laser techniques, we have determined that the nonlinearity turns off in times on the order of 50-100 ps. These excitonic nonlinearities are, therefore, both large in magnitude and extremely rapid.

Citation Download Citation

J E Potts, H Cheng, S H Park, B Fluegel, M Joffre, S W Koch, and N Peyghambarian "Excitonic Optical Nonlinearities In ZnSe Epitaxial Films", Proc. SPIE 0881, Optical Computing and Nonlinear Materials, (3 May 1988); https://doi.org/10.1117/12.944069

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