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18 August 2005 Nonlinear Raman nano-imaging using plasmons localized at a metallic tip
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Near-field Raman spectroscopy using an apertureless metallic probe has attracted much attention owing to its capability of chemical analysis with high spatial resolution far beyond the diffraction limit. The local plasmon excited at the probe tip amplifies optical near-field in the vicinity of the tip apex, and the local field is used to enhance Raman scattering. The metallic probe contributes not only to the enhancement of the Raman scattering, but also to spectral changes due to the chemical and mechanical interaction between the metal and the molecules. We experimentally and theoretically investigated these two effects in this study. These effects selectively provide vibrational information of the molecules directly adsorbed on the metal, and, therefore, have a potential to improve the spatial resolution. In addition, the metallic probe has also been applied for enhancement of nonlinear Raman scattering. Coherent anti-Stokes Raman scattering (CARS) has been strongly enhanced by the probe, and has provided molecular-vibration images of deoxyribo nucleic acid (DNA) with high spatial resolution.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Taro Ichimura and Yasushi Inouye "Nonlinear Raman nano-imaging using plasmons localized at a metallic tip", Proc. SPIE 5928, Plasmonic Nano-imaging and Nanofabrication, 592802 (18 August 2005);

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