Limits of Acousto-Electro-Optic GaAs/GaAlAs Multiple Quantum Well Modulators
In the last decade a great interest has been devoted to optical absorption in Multiple Quantum Well (MQW) and superlattice based devices. These structures are characterized by the confinement of charge carriers, electrons and holes, in the neighborhood of each other. This carrier confinement enhances optical absorption via the excitonic resonance in the presence of external electric field. Room temperature Stark Effect is thus improved and is known as “Quantum Confined Stark Effect” (QCSE). As in bulk material, Stark Effect is characterized by the red shift of the optical absorption edge resulting from band gap shrinkage.
KeywordsAbsorption Edge Surface Acoustic Wave Contrast Ratio Acoustic Power Multiple Quantum
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