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Proceedings Paper

Optical sensing based on localized surface plasmons
Author(s): Romain Quidant; Stefan Enoch; Mark Kreuzer; Goncal Badenes
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Paper Abstract

Resonant noble metal nanoparticles with dimensions of a few tens of nanometers and sustaining Localized Surface Plasmon (LSP) modes have been recently proposed as good candidates for increasing both integration and sensitivity compared to conventional extended thin metal films. Very recently several groups have reported results of sensing with a single nano-particle. The study we present contains two main parts. First, using randomly distributed colloidal gold spheres, we demonstrate the ability of LSP sensors for monitoring quantitatively and without the use of any label, the binding between small organic molecules and antibodies with real-life applications. In a second part, the Fourier Modal Method (FMM) is used to model controlled geometries of particles that allow for optimizing the sensor properties. In particular, we show that the electromagnetic coupling within a periodic 2D particle array can be optimized to increase the field localization and thus the sensitivity of the sensor.

Paper Details

Date Published: 7 July 2005
PDF: 12 pages
Proc. SPIE 5840, Photonic Materials, Devices, and Applications, (7 July 2005); doi: 10.1117/12.608347
Show Author Affiliations
Romain Quidant, ICFO-Institut de Ciencies Fotoniques (Spain)
Stefan Enoch, Univ. de Aix-Marseille (France)
Mark Kreuzer, IIQAB-CSIC (Spain)
Goncal Badenes, ICFO-Institut de Ciencies Fotoniques (Spain)

Published in SPIE Proceedings Vol. 5840:
Photonic Materials, Devices, and Applications
Goncal Badenes; Derek Abbott; Ali Serpenguzel, Editor(s)

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