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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 8 — Apr. 17, 2006
  • pp: 3512–3527

Optimization of metal-clad waveguides for sensitive fluorescence detection

Aldo Minardo, Romeo Bernini, Flavio Mottola, and Luigi Zeni  »View Author Affiliations

Optics Express, Vol. 14, Issue 8, pp. 3512-3527 (2006)

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Recently, metal-clad leaky waveguides (MCLW) have been proposed as highly sensitive single point sensor devices for small-volume refractive index (RI) and fluorescence detection. In this paper, we present a theoretical study of the efficiency of MCLW-based sensors on glass substrate, for fluorescence detection. It is shown that MCLWs can be designed in order to obtain an efficient coupling of fluorescence emission with their leaky modes. This leads to a higher directionality of the fluorescence emission into the glass substrate, when compared to the emission near a pure glass/water interface and surface-plasmon coupled emission (SPCE). Numerical analyses also indicate that collecting the fluorescence emission through a water-immersed microscope objective, may result in a 70-fold enhancement of the detectable signal when compared to conventional fluorescence detection carried out on a glass slide.

© 2006 Optical Society of America

OCIS Codes
(260.2110) Physical optics : Electromagnetic optics
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

ToC Category:
Optics at Surfaces

Original Manuscript: March 7, 2006
Revised Manuscript: April 7, 2006
Manuscript Accepted: April 8, 2006
Published: April 17, 2006

Virtual Issues
Vol. 1, Iss. 5 Virtual Journal for Biomedical Optics

Aldo Minardo, Romeo Bernini, Flavio Mottola, and Luigi Zeni, "Optimization of metal-clad waveguides for sensitive fluorescence detection," Opt. Express 14, 3512-3527 (2006)

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