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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 5 — May. 17, 2007

Photonic jet driven non-linear optics: example of two-photon fluorescence enhancement by dielectric microspheres

Sylvain Lecler, Stefan Haacke, Nhan Lecong, Olivier Crégut, Jean-Luc Rehspringer, and Charles Hirlimann  »View Author Affiliations

Optics Express, Vol. 15, Issue 8, pp. 4935-4942 (2007)

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The two-photon excited fluorescence from a dye solution is enhanced when a small amount of micro-meter sized silica beads are added. This observation is made in the simple scattering regime (inter-sphere distance four times larger than their radius) and is shown to depend on the concentration of the silica spheres. For a solution of rhodamine B, the enhancement can reach more than 30 %. As complementary experiments show that the fluorescence efficiency is unchanged, we argue that the non-linear absorption is enhanced due to focussing of the incident beam in the near-field of the spheres, a situation previously referred to as photonic (nano-)jets [3]. Our calculations indeed show that for the parameters of the spheres studied near-field focussing leads to an intensity concentration close to the sphere surface. We suggest that these photonic jets could be used to enhance other non-linear optical effects.

© 2007 Optical Society of America

OCIS Codes
(170.6280) Medical optics and biotechnology : Spectroscopy, fluorescence and luminescence
(190.0190) Nonlinear optics : Nonlinear optics
(290.0290) Scattering : Scattering

ToC Category:
Nonlinear Optics

Original Manuscript: December 21, 2006
Revised Manuscript: February 12, 2007
Manuscript Accepted: February 17, 2007
Published: April 9, 2007

Virtual Issues
Vol. 2, Iss. 5 Virtual Journal for Biomedical Optics

Sylvain Lecler, Stefan Haacke, Nhan Lecong, Olivier Crégut, Jean-Luc Rehspringer, and Charles Hirlimann, "Photonic jet driven non-linear optics: example of two-photon fluorescence enhancement by dielectric microspheres," Opt. Express 15, 4935-4942 (2007)

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