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- W1976796222 abstract "InGaAs single quantum dot photoluminescence spectra and images are investigated by using a low-temperature near- field optical microscope. By modifying the commonly used near-field apertured prove, a high spatial resolution and high detection efficiency are achieved simultaneously. Local collection of the emission signal through a 500 nm aperture contributes to the single-dot imaging with a (lambda) /6 resolution, which is a significant improvement over the convention spatially resolved spectroscopy. Tailoring the tapered structure of the near-field probe enables us to obtain the emission spectra of single dots in the weak excitation region, where the carrier injection rate is approximately 107 excitons/s per dot. By employing such a technique, we examine the evolution of single-dot emission spectra with excitation intensity. In addition to the ground-state emission, excited-state and biexciton emissions are observed for higher excitation intensities. By a precise investigations of the excitation power dependences of individual dots, 2D identification of their emission origins is obtained for the first time.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
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- W1976796222 date "1998-10-13" @default.
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- W1976796222 title "<title>Near-field optical spectroscopy of excitons in single quantum dots</title>" @default.
- W1976796222 doi "https://doi.org/10.1117/12.326821" @default.
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