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Proceedings Paper

Nonlinear Raman nano-imaging using plasmons localized at a metallic tip
Author(s): Taro Ichimura; Yasushi Inouye
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Paper Abstract

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.

Paper Details

Date Published: 18 August 2005
PDF: 9 pages
Proc. SPIE 5928, Plasmonic Nano-imaging and Nanofabrication, 592802 (18 August 2005); doi: 10.1117/12.618669
Show Author Affiliations
Taro Ichimura, Osaka Univ. (Japan)
Yasushi Inouye, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 5928:
Plasmonic Nano-imaging and Nanofabrication
Satoshi Kawata; Vladimir M. Shalaev; Din Ping Tsai, Editor(s)

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