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Proceedings Paper

Adiabatic focusing of surface plasmon polaritons for label free detection of few molecules by means of Raman scattering
Author(s): F. De Angelis; G. Das; C. Liberale; P. Candeloro; F. Mecarini; M. L. Coluccio; Enzo Di Fabrizio
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Paper Abstract

Here we report the design, the fabrication and measurement of a photonic-plasmonic device that is fully compatible with AFM microscopy and surface enhanced Raman spectroscopy. The physical mechanism exploited is the adiabatic compression of Surface Plasmon Polaritons which propagate along a silver nanocone generating a very high electric field at the tip end. A photonic crystal cavity is employed to efficiently couple the external laser radiation with the nanocone. The reported measurements demonstrate the accumulation of the electric field at the tip of the nanocone that allow the detection of a few molecules located near the tip end. The estimated Raman enhancement factor is about 106 with respect to a standard configuration. The present results open a good perspective for the development of an integrated Raman-AFM microscopy able to perform both topography and chemical mapping in label free condition with a spatial resolution comparable to the tip end.

Paper Details

Date Published: 3 September 2009
PDF: 9 pages
Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 739404 (3 September 2009); doi: 10.1117/12.829965
Show Author Affiliations
F. De Angelis, Univ. degli studi Magna Græcia di Catanzaro (Italy)
G. Das, Univ. degli studi Magna Græcia di Catanzaro (Italy)
C. Liberale, Univ. degli studi Magna Græcia di Catanzaro (Italy)
P. Candeloro, Univ. degli studi Magna Græcia di Catanzaro (Italy)
F. Mecarini, Univ. degli studi Magna Græcia di Catanzaro (Italy)
M. L. Coluccio, Univ. degli studi Magna Græcia di Catanzaro (Italy)
Enzo Di Fabrizio, Univ. degli studi Magna Græcia di Catanzaro (Italy)
TASC National Lab., CNR-INFM (Italy)


Published in SPIE Proceedings Vol. 7394:
Plasmonics: Metallic Nanostructures and Their Optical Properties VII
Mark I. Stockman, Editor(s)

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