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Enhancing fluorescence of quantum dots by silica-coated gold nanorods under one- and two-photon excitation
KTH, School of Biotechnology (BIO), Theoretical Chemistry.ORCID iD: 0000-0001-6508-8355
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-3401-1125
2010 (English)In: Optics Express, ISSN 1094-4087, Vol. 18, no 11, 11335-11346 p.Article in journal (Refereed) Published
Abstract [en]

Nano-composites of quantum dots (QDs) and gold nanorods (GNRs) or silica-coated GNRs (GNRs_SiO2) were synthesized. The attached GNRs modify the excitation intensity and spontaneous emission of QDs through the surface plasmonic effects. The fluorescence from QDs is enhanced and can be optimized by modifying the thickness of silica coated on GNRs, under both one-and two-photon excitations. The measurements of fluorescence intensity and lifetime demonstrate that the enhancement may be attributed to the matching of the localized surface plasmon resonance of GNR to the excitation wavelength. In addition to enhancing QD-fluorescence in QD-GNR@SiO2, GNRs also present as an effective contrast agent for bio-imaging, through light scattering and or two-photon emission, as well as for photo-thermal therapy. The composite's multifunctional characteristics are highly valuable and to be exploited in bio-applications. (C) 2010 Optical Society of America

Place, publisher, year, edition, pages
2010. Vol. 18, no 11, 11335-11346 p.
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-27320ISI: 000278512300049OAI: diva2:376003
QC 20101209Available from: 2010-12-09 Created: 2010-12-09 Last updated: 2013-11-19Bibliographically approved

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