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Proceedings Paper

Optical spectroscopy of molecules on metallic nanoparticles and on nanostructured metallic surfaces
Author(s): Katrin D. Kneipp; Harald Kneipp; Irving Itzkan; Ramachandra R. Dasari; Michael S. Feld
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Paper Abstract

In the vicinity of small metal particles in dimensions of tens of nanometers or close to nanostructured metallic surfaces, local optical fields can be strongly enhanced due to resonances with collective excitation of the conduction electrons in these metallic nanostructures. These enhanced local fields open up exciting opportunities for enhancing spectroscopic signals and to perform spectroscopy on single molecules. We report surface-enhanced Raman studies on silver and gold nanostructures. The field strengths in the hot spots on silver and gold colloidal cluster structures are inferred to be enhanced on the order of 103 resulting in field enhancement factors for Raman scattering up to 1012. Simultaneously, as a further advantage for Raman spectroscopy, the fluorescence of the target molecules is quenched by new non-radiative decay channels to the metal.

Paper Details

Date Published: 18 June 2001
PDF: 5 pages
Proc. SPIE 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications, (18 June 2001); doi: 10.1117/12.430760
Show Author Affiliations
Katrin D. Kneipp, Technical Univ. Berlin and Massachusetts Institute of Technology (Germany)
Harald Kneipp, Technical Univ. Berlin (Germany)
Irving Itzkan, Massachusetts Institute of Technology (United States)
Ramachandra R. Dasari, Massachusetts Institute of Technology (United States)
Michael S. Feld, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 4258:
Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications
Catherine J. Murphy, Editor(s)

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