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physica status solidi (b)

Strong Dispersive Nonlinearity in the Excitonic Region of Wide‐Gap II–VI Compounds at Room Temperature

Ch. Spiegelber, M. Kretzschmar, J. Puls, F. Henneberger

Published Dec 1, 1988• 11 citations
Publisher

Abstract

Abstract The intensity‐dependent change of the refraction index of CdS at room temperature is deduced from degenerate four wave mixing experiments. For an application of the very strong dispersive nonlinearity optical switching, and bistability are demonstrated using the 514 nm output of an Ar+‐laser.
DOI
10.1002/pssb.2221500266

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Abstract Under high excitation conditions thick CdS samples show pronounced broad‐band nonlinear transmission in the bound exciton region and up to a wavelength of about 515 nm at cryo‐temperatures. This behavior is only explainable in a model based on impurity neutralization and bound exciton creation. The suitability of these nonlinearities to yield optical bistability will be shown. Bistable operation is investigated in dependence of crystal thickness, impurity concentration, excitation density, wavelength, and temperature. A strong correlation to acceptor‐bound exciton generation is obtained, and the explanation of this bistable operation fits well with that of the above mentioned transmission behavior.