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Optical up-conversion processes in InAs quantum dots
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
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2001 (English)In: Japanese Journal of Applied Physics, ISSN 0021-4922, Vol. 40, no 3 B, 2080-2083 p.Article in journal (Refereed) Published
Abstract [en]

Up-converted photoluminescence (UPL) in InAs/GaAs self-assembled quantum dots (QDs) is reported. With a resonant excitation of QDs we observe an efficient emission from the GaAs barrier. The excitation spectrum of the UPL shows that the signal disappears if the excitation energy is tuned below the absorption band of the QDs. The intensity of UPL exhibits an almost quadratic dependence on the excitation intensity. The observed effect is explained by a two-step two-photon absorption process involving quantum dot states as intermediate states. ⌐ 2001 The Japan Society of Applied Physics.

Place, publisher, year, edition, pages
2001. Vol. 40, no 3 B, 2080-2083 p.
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Natural Sciences
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URN: urn:nbn:se:liu:diva-40630Local ID: 53680OAI: oai:DiVA.org:liu-40630DiVA: diva2:261479
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2011-01-13

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Paskov, PlamenHoltz, Per-OlofMonemar, Bo

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