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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Two-photon absorption from single InGaN/GaN quantum dots

Jarjour, A.F. and Green, A.M. and Parker, T.J. and Taylor, R.A. and Oliver, R.A. and Briggs, G.A.D. and Kappers, M.J. and Humphreys, C.J. and Martin, R.W. and Watson, I.M. (2006) Two-photon absorption from single InGaN/GaN quantum dots. Physica E: Low-dimensional Systems and Nanostructures, 32 (1-2). pp. 119-122.

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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.