Sub-Microscopic Probing of Intrinsic and Extrinsic Enhancement of Second Harmonic Generation of Nano-Structured Gold Surfaces

  • S. Brasselet
  • C. Anceau
  • P. Gadenne
  • J. Zyss
Chapter
Part of the NATO Science Series book series (NAII, volume 100)

Abstract

This paper describes the local enhancement of quadratic nonlinear optical properties of granular gold nano-structures and their effect on nonlinear molecules deposited on them. A two-photon excitation microscope has been employed in order to detect second harmonic generation with a sub-microscopic resolution. Surface-SHG from the gold granular structures exhibits intense signals in sub-micrometer sized regions randomly localized on the surface. The spatial distribution and polarization state of these signals provides significant information on the underlying physics of the local enhancement effect. We show furthermore that the signal from nonlinear chromophores deposited on these substrates is strongly enhanced with factors up to 2×103, before decaying within a few seconds. Quantitative measurements indicate a significant local electromagnetic contribution to the molecular enhancement. Molecular damage and possible metal-molecule interactions are analyzed in order to explain the magnitude and the fast decay of this effect.

Keywords

Quartz Anisotropy Bromide Pyridine Marin 

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Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • S. Brasselet
    • 1
  • C. Anceau
    • 1
    • 2
  • P. Gadenne
    • 2
  • J. Zyss
    • 1
  1. 1.Laboratoire de Photonique Quantique et MoléculaireEcole Normale Supérieure de CachanCachanFrance
  2. 2.Laboratoire de Magnétisme et d’Optique de VersaillesUniversité de Versailles Saint-Quentin en YvelinesVersailles CedexFrance

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