Scanning Near-Field Optical Microscopic Observation of Surface-Enhanced Raman Scattering Mediated by Metallic Particle-Surface Gap Modes
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概要
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Samples consisting of a copper phthalocyanine (CuPc) thin film sandwiched between Au particles and a Ag film were prepared and their Raman scattering was investigated with a scanning near-field optical microscope (SNOM). The Raman intensity of CuPc was found to be greatly enhanced by the presence of the Au particles and takes a maximum on top of the particles. It was also found that the enhancement factor depends strongly on the diameter of Au particles and the excitation wavelength. With the aid of reflection-absorption spectra, which exhibited an absorption peak attributable to the gap mode of the particle–surface system, the observed behavior of the enhancement factor could be explained by the resonance of incident and scattered light to the gap mode. The present results clearly demonstrate that the gap between the metallic particle and surface is a hot site of Raman scattering.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-07-15
著者
-
Hayashi Shinji
Department Of Anatomy And Embryology Tokyo Metropolitan Institute For Neuroscience
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Konishi Toshitaka
Department of Electrical and Electronics Engineering, Faculty of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan
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