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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 25 — Dec. 16, 2013
  • pp: 31293–31302

Nonlinear excitation power dependence of surface enhanced fluorescence from a nanostructured Ag film

Kun-Yu Tai, Ti-Li Lin, and Hung-Chih Kan  »View Author Affiliations


Optics Express, Vol. 21, Issue 25, pp. 31293-31302 (2013)
http://dx.doi.org/10.1364/OE.21.031293


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Abstract

We investigate the excitation power dependence of fluorescent emission from Cy3-tagged molecules separated from an Ag film prepatterned with arrays of nanostructures by a thin spacer. While the fluorescent intensities from both the patterned area and the flat Ag surfaces increase monotonically with the power of excitation light, the fluorescent contrast between them decreases with excitation power in a nonlinear fashion. We propose a simple theoretical model which includes basic properties of molecular fluorescence, the effect of near field enhancement from surface plasmon excited on the patterned structure, and the effect of enhancement of fluorescent emission rate and non-radiative decay rate. Our results agree qualitatively with the prediction of a model for which there is a larger enhancement of the excitation rate than that of the total decay rate of the excited molecule.

© 2013 Optical Society of America

OCIS Codes
(180.1790) Microscopy : Confocal microscopy
(240.6680) Optics at surfaces : Surface plasmons
(260.2510) Physical optics : Fluorescence
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Plasmonics

History
Original Manuscript: October 8, 2013
Revised Manuscript: December 2, 2013
Manuscript Accepted: December 3, 2013
Published: December 11, 2013

Virtual Issues
Vol. 9, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Kun-Yu Tai, Ti-Li Lin, and Hung-Chih Kan, "Nonlinear excitation power dependence of surface enhanced fluorescence from a nanostructured Ag film," Opt. Express 21, 31293-31302 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-25-31293


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