Abstract
We report the observation of a μm range periodical modulation of a band gap caused by gratinglike quantum well intermixing in an intrinsic GaAs/AlGaAs quantum well structure. The intermixing grating was formed with the irradiation of the interference fringe of the second harmonic of a Q-switched Nd:YAG laser followed by a rapid thermal annealing process. The intermixing grating periods were measured with an optical setup for simultaneously monitoring the photoluminescence intensities of two closely spaced wavelengths with a sub-μm spatially scanning resolution. The measured periods included a cluster of features around 2 μm which was consistent with that of the laser interference fringe.
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