Abstract
We performed near-field spectroscopy and microscopy of InAs/AlGaAs quantum-dot-based nanoclusters and observed the blueshift (up to 20 meV) of the photoluminescence spectra as the power density is increased. In particular, we observed a gradual change in the dominant luminescence energies of a nanocluster in real space from a lower energy state (1.4150 eV) to a higher energy state (1.4392 eV) with increasing excitation power, which is indicative of the band-filling effect of semiconductor nanostructures.
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