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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 11 — May. 24, 2010
  • pp: 11335–11346

Enhancing fluorescence of quantum dots by silica-coated gold nanorods under one- and two-photon excitation

Xin Li, Fu-Jen Kao, Chien-Chin Chuang, and Sailing He  »View Author Affiliations

Optics Express, Vol. 18, Issue 11, pp. 11335-11346 (2010)

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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.

© 2010 OSA

OCIS Codes
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.6280) Medical optics and biotechnology : Spectroscopy, fluorescence and luminescence
(240.6680) Optics at surfaces : Surface plasmons
(260.2510) Physical optics : Fluorescence
(160.4236) Materials : Nanomaterials

ToC Category:

Original Manuscript: April 8, 2010
Revised Manuscript: May 9, 2010
Manuscript Accepted: May 9, 2010
Published: May 13, 2010

Virtual Issues
Vol. 5, Iss. 10 Virtual Journal for Biomedical Optics

Xin Li, Fu-Jen Kao, Chien-Chin Chuang, and Sailing He, "Enhancing fluorescence of quantum dots by silica-coated gold nanorods under one- and two-photon excitation," Opt. Express 18, 11335-11346 (2010)

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