Intense laser field effect on the interband absorption in differently shaped near-surface quantum wells |
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Authors: | Nicoleta Eseanu |
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Affiliation: | Physics Department, “Politehnica” University of Bucharest, 313 Splaiul Independentei, RO-060042, Bucharest, Romania |
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Abstract: | The 1S-exciton properties and interband absorption spectra in differently shaped near-surface quantum wells (NSQWs) with symmetrical/asymmetrical barriers, under intense laser field, are investigated taking into account the correct dressing effect for the confinement potential and electrostatic interaction between carriers and their image-charges. We found that: i) the 1S-exciton binding energy is significantly reduced by the laser intensity in InGaAs NSQWs of different asymmetrical shape; ii) the red-shift of the absorption peak induced by the asymmetry diminution or by increasing cap layer thickness can be effectively compensated using the blue-shift caused by enhancing laser parameter. Therefore, the optical properties of the differently shaped NSQWs could be tuned by proper tailoring of the heterostructure parameters (well shape, barrier asymmetry) and/or dielectric mismatch as well as by varying the laser field intensity. |
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Keywords: | Near-surface quantum well Exciton states Laser-dressed potential Dielectric mismatch Interband transitions |
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