Optical spectroscopy of molecules on metallic nanoparticles and on nanostructured metallic surfaces

Katrin D. Kneipp; Harald Kneipp; Irving Itzkan; Ramachandra R. Dasari; Michael S. Feld

doi:10.1117/12.430760

18 June 2001 Optical spectroscopy of molecules on metallic nanoparticles and on nanostructured metallic surfaces

Katrin D. Kneipp, Harald Kneipp, Irving Itzkan, Ramachandra R. Dasari, Michael S. Feld

Proceedings Volume 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications; (2001) https://doi.org/10.1117/12.430760
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

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.

Citation Download Citation

Katrin D. Kneipp, Harald Kneipp, Irving Itzkan, Ramachandra R. Dasari, and Michael S. Feld "Optical spectroscopy of molecules on metallic nanoparticles and on nanostructured metallic surfaces", Proc. SPIE 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications, (18 June 2001); https://doi.org/10.1117/12.430760

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