Interband absorption in square and semiparabolic near-surface quantum wells under intense laser field |
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Authors: | E C Niculescu N Eseanu |
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Institution: | (1) Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa K1A 0R6, ON, Canada;(2) Physics Department, University of OttawaResearch Council of Canada, 150 Louis Pasteur, Ottawa K1N 6N5, ON, Canada |
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Abstract: | The exciton effects on the interband absorption spectra in near-surface square and
semiparabolic quantum wells under intense laser field are studied taking into account the correct
dressing effect for the confinement potential and electrostatic self-energy due to the repulsive
interaction between carriers and their image charges. We found that for near-surface quantum wells with
different shapes the laser field induces significant effects on their electronic and optical properties.
The numerical results for the InGaAs/GaAs system show that the red-shift of the absorption peak induced
by the increasing cap layer can be effectively compensated using the blue-shift caused by the enhanced
laser parameter. In square quantum well without laser field our theoretical values for the absorption
peak position are in good agreement with the available experimental data. As a key result, we conclude
that the optical properties in near-surface quantum wells can be tuned by tailoring the heterostructure
parameters: well shape, capped layer thickness and/or dielectric mismatch as well as the external field
radiation strength. |
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Keywords: | |
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