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Quantum Electronics

Characteristic features of the steady-state transmission (reflection) by a thin semiconductor film in the exciton part of the spectrum

P. I. Khadzhi, D. V. Tkachenko, S L Gaivan

Published Jun 30, 1999• 1 citation
Publisher

Abstract

The steady-state transmission (reflection) of laser radiation by a thin semiconductor film was investigated taking into account the exciton — photon and elastic exciton — exciton interactions. Under certain conditions the resultant dependences of the transmission by a thin film on the amplitude of the incident radiation and on the detuning from a resonance exhibit a hysteresis, which can be explained by a shift of the exciton level when the exciton density is increased.

DOI
10.1070/qe1999v029n06abeh001527

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The steady-state transmission (reflection) of laser radiation by a thin semiconductor film was investigated taking into account the exciton — photon and elastic exciton — exciton interactions. Under certain conditions the resultant dependences of the transmission by a thin film on the amplitude of the incident radiation and on the detuning from a resonance exhibit a hysteresis, which can be explained by a shift of the exciton level when the exciton density is increased.
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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.