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Strong elastic scattering of laser light, up to 200 times background, is found at the exciton resonance of GaAs/AlGaAs multi-quantum-we 11 structures. It is shown to be a consequence of spatial fluctuations of the refractive index due to inhomogeneous broadening of the resonance. The frequency and temperature dependence of the homogeneous linewidth can be obtained from the data.

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Abstract:We provide a detailed theoretical investigation of two-photon absorption photoconductivity in semiconductor microcavities. We show that a high enhancement of the non-linear response (>10000) can be obtained due to the microcavity effect. We discuss in detail the design and performance (dynamic range, speed) of such a device with the help of an example of a AlGaAs/GaAs microcavity operating at 900nm. This device is promising for low intensity fast autocorrelation and demultiplexing applications.