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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1995),
  • paper QTuJ4

GaAs/AIGaAs quantum-dot near-field scanning optical spectroscopy

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Abstract

Quantum dots (QDs) with dimensions less than the optical wavelength and of the order of the Bohr radius of the exciton are expected to exhibit novel types of carrier- phonon and carrier-photon relaxation mechanisms1-3 because of the radical change in the carrier, phonon, and photon density of states due to the three-dimensional confinement, Other predicted optical nonlinearities, such as a concentrated oscillator strength and superradiance,4 might be very useful in the fabrication of optoelectronic devices. The near-field scanning optical microscope (NSOM) with a spatial resolution better than a tenth of an optical wavelength is ideally suited for studying individual nanostructures such as QDs. We have obtained images and spatially resolved spectra of 100-nm QDs of surface-passivated GaAs/AIGaAs quantum wells of varying thickness with a low-temperature NSOM.5

© 1995 Optical Society of America

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