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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Transmission of phase modulated laser light through a thin semiconductor film in the excitonic spectral range and an optical analog of the Feshbach effect

P. I. Khadzhi, Igor V. Beloussov, Nikolay N. Rosanov, Sergey V. Fedorov, A. V. Corovai, D. A. Markov

Published Sep 10, 2010• 1 citation
Publisher

Abstract

A theoretical and numerical analysis of the transmission of phase modulated laser pulses through a thin film with excitonic nonlinearity is performed. It is shown that, by choosing the modulation law, one can efficiently control the optical nonlinearity of the film down to the inversion of the sign of nonlinearity.
DOI
10.1117/12.881423

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A theoretical investigation is reported of the coherent nonlinear response of excitons and biexcitons in a thin semiconductor film subjected to resonant laser radiation. It is shown that saturation of an exciton transition results in an abrupt qualitative change in the nature of film transmission from total reflection of the incident pulse at low pump amplitudes to oscillatory reflection at high amplitudes. A new area theorem is derived for ultrashort pulses: it establishes a correspondence between the areas of the incident, transmitted, and reflected pulses. Anomalous transmission and reflection (area 'quantisation') is predicted for large values of the nonlinear parameter. The equations of state, describing bistable behaviour of the amplitudes of the fields of the transmitted and reflected radiation, are derived for quasi-cw operation.