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Mid-infrared phase modulation via Stark effect on intersubband transitions in GaAs/GaAlAs quantum wells

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3 Author(s)
Dupont, E.B. ; THOMSON-CSF, Orsay, France ; Delacourt, D. ; Papuchon, Michel

Mid-infrared (~10 μm) electrorefractive effects of intersubband transitions in step GaAs/GaAlAs quantum wells are experimentally analyzed. A method for studying infrared electrorefraction of a two-dimensional structure via the Stark effect is used. The anomalous dispersion is measured over the entire spectral range of the transition and is found to be consistent with the Kramers-Kronig relations in the case of a Lorentzian absorption shape. A solution of Maxwell's equations in the multiquantum well structure is detailed and leads to a good agreement with experimental data. A standard interferometer and a lock-in technique allow a quasi-direct determination of phase and amplitude modulation with very good sensitivity. A theoretical approach based on a Lorentzian model and the solution of Maxwell's equations for a multiple QW (quantum well) structure agreed well with the data

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Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 8 )