Near-Field Two-Photon Excitation Images of Gold Nanorods

Near-Field Two-Photon Excitation Images of Cold Nanorods 

Enhanced Optical Fields in Spherical Nanoparticle Assemblies and Surface Enhanced Raman Scattering 

According to the electromagnetic simulation, the enhancement factor of the electric field can be as high as a few thousand under some conditions, and 

We also tried measurements to demonstrate that hot spots make significant contributions to surface enhanced Raman scattering [34]. For this purpose, the sample of nanoparticie assembly was doped with Raman active molecules by a spincoating method, and near-field excited Raman scattering from the sample was recorded. We adopted Rhodamine 6G dye as a Raman active material, which is 

To summarize, we have shown here that enhanced electric-field distribution in metal nanoparticle assemblies can be visualized on the nanoscale by a near-field two-photon excitation imaging method. By combining this method and near-field Raman imaging, we have clearly demonstrated that hot spots in noble metal nanoparticle assemblies make a major contribution to surface enhanced Raman scattering. 

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