| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1547940 | Physica E: Low-dimensional Systems and Nanostructures | 2006 | 4 Pages |
Abstract
We present a study of the time-integrated and time-resolved photoluminescence properties of single-InGaN/GaN quantum dots (QDs) using two-photon spectroscopy. Two samples containing QDs produced by different growth techniques are examined. We find that two-photon excitation results in the suppression of the emission from the underlying quantum well to which the QDs are coupled and yet relatively strong QD emission is observed. This effect is explained in terms of the enhancement of two-photon absorption in QDs due to the full confinement of carriers. Furthermore, evidence of the presence of excited states is revealed from the two-photon photoluminescence excitation spectra presented in the study.
Keywords
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Anas F. Jarjour, Alex M. Green, Tim J. Parker, Robert A. Taylor, Rachel A. Oliver, G. Andrew D. Briggs, Menno J. Kappers, Colin J. Humphreys, Robert W. Martin, Ian M. Watson,