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Local second-harmonic generation enhancement on gold nanostructures probed by two-photon microscopy
C Anceau1, S Brasselet, J Zyss
1Laboratoire de Magnétisme et d'Optique de Versailles, Université de Versailles Saint-Quentin en Yvelines, 78035 Versailles Cedex, France.
Optics Letters
|May 16, 2003
Summary
Surface second-harmonic generation (S-SHG) enhancements in gold nanoparticles were studied using two-photon microscopy. Findings show S-SHG is highly sensitive to gold surface morphology and exhibits ultrafast fluctuations.
Area of Science:
- Plasmonics
- Nonlinear Optics
- Surface Science
- Nanotechnology
Background:
- Surface second-harmonic generation (S-SHG) is a sensitive probe of surface properties.
- Local plasmon resonance in granular gold structures can significantly enhance S-SHG.
- Understanding S-SHG localization is crucial for applications in sensing and imaging.
Purpose of the Study:
- To investigate the spatial localization of S-SHG enhancements in granular gold.
- To correlate S-SHG enhancement with gold surface morphology and local plasmon resonance.
- To characterize the nature of the S-SHG emission in enhancement regions.
Main Methods:
- Utilized two-photon microscopy for high-resolution S-SHG imaging.
- Fabricated granular gold structures with varying surface morphologies.
- Performed polarization measurements of local S-SHG responses.
Main Results:
- S-SHG enhancement magnitude and density strongly depend on gold surface morphology.
- Polarization measurements revealed local field anisotropy in enhancement regions.
- Emission was found to be incoherent and strongly depolarized.
Conclusions:
- S-SHG is a powerful tool for mapping plasmonic enhancements on gold surfaces.
- The observed S-SHG characteristics are attributed to ultrafast fluctuations in enhancement location.
- Results provide insights into the dynamics of plasmon-enhanced nonlinear optical signals.