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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 1, Iss. 4 — Nov. 1, 2010
  • pp: 1075–1083

Two-photon fluorescence correlation spectroscopy with high count rates and low background using dielectric microspheres

Heykel Aouani, Peter Schön, Sophie Brasselet, Hervé Rigneault, and Jérôme Wenger  »View Author Affiliations


Biomedical Optics Express, Vol. 1, Issue 4, pp. 1075-1083 (2010)
http://dx.doi.org/10.1364/BOE.1.001075


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Abstract

Two-photon excitation fluorescence is a powerful technique commonly used for biological imaging. However, the low absorption cross section of this non-linear process is a critical issue for performing biomolecular spectroscopy at the single molecule level. Enhancing the two-photon fluorescence signal would greatly improve the effectiveness of this technique, yet current methods struggle with medium enhancement factors and/or high background noise. Here, we show that the two-photon fluorescence signal from single Alexa Fluor 488 molecules can be enhanced up to 10 times by using a 3 µm diameter latex sphere while adding almost no photoluminescence background. We report a full characterization of the two-photon fluorescence enhancement by a single microsphere using fluorescence correlation spectroscopy. This opens new routes to enhance non-linear optical signals and extend biophotonic applications.

© 2010 OSA

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(170.6280) Medical optics and biotechnology : Spectroscopy, fluorescence and luminescence
(230.3990) Optical devices : Micro-optical devices
(290.4020) Scattering : Mie theory
(300.6410) Spectroscopy : Spectroscopy, multiphoton

ToC Category:
Optical Biophysics

History
Original Manuscript: July 12, 2010
Revised Manuscript: September 6, 2010
Manuscript Accepted: September 29, 2010
Published: October 5, 2010

Citation
Heykel Aouani, Peter Schön, Sophie Brasselet, Hervé Rigneault, and Jérôme Wenger, "Two-photon fluorescence correlation spectroscopy with high count rates and low background using dielectric microspheres," Biomed. Opt. Express 1, 1075-1083 (2010)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-1-4-1075


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