Abstract
The photorefractive (PR) properties of semi-insulating GaAs/AlGaAs multiple quantum wells (MQWs) operating in the Franz–Keldysh geometry are modelled by solving the material equations including the nonlinear transport of hot electrons. This work studies the PR response of MQWs in a two-wave mixing geometry under a moving grating. Calculations were made under the small intensity modulation approximation, and the simulation results are compared with experimental data available in the literature. A reasonable qualitative agreement regarding most experimental characteristics was found. The results can be treated as a test of the correctness of the commonly used band transport model of PR behaviour in MQWs. Analytic solutions for the stationary and transient regimes under negligible diffusion are given. In addition, the conditions for the occurrence of a strong resonance predicted by the model are noted.
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This work was supported by the National Center for Science under the project awarded by Decision Number DEC-2011/01/B/ST7/06234.
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Wichtowski, M. Wave mixing analysis in photorefractive quantum wells in the Franz–Keldysh geometry under a moving grating. Appl. Phys. B 115, 505–516 (2014). https://doi.org/10.1007/s00340-013-5631-y
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DOI: https://doi.org/10.1007/s00340-013-5631-y