Adiabatic focusing of surface plasmon polaritons for label free detection of few molecules by means of Raman scattering

F. De Angelis*, Gobind Das, Carlo Liberale, P. Candeloro, F. Mecarini, M. L. Coluccio, Enzo Di Fabrizio

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationPlasmonics
Subtitle of host publicationMetallic Nanostructures and Their Optical Properties VII
DOIs
StatePublished - Nov 18 2009
EventPlasmonics: Metallic Nanostructures and Their Optical Properties VII - San Diego, CA, United States
Duration: Aug 2 2009Aug 6 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7394
ISSN (Print)0277-786X

Other

OtherPlasmonics: Metallic Nanostructures and Their Optical Properties VII
CountryUnited States
CitySan Diego, CA
Period08/2/0908/6/09

Keywords

  • Adiabatic concentration
  • Nanoantenna
  • Photonic crystal
  • Plasmon
  • Raman
  • SERS
  • Tapered waveguide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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