Spectroscopy with scanning near-field optical microscopy using photon tunnelling mode.
We have demonstrated Raman spectroscopy using scanning near-field optical microscopy (SNOM). Photon tunnelling mode was employed, in which the sample is illuminated using an attenuated total reflection (ATR) configuration and the evanescent wave perturbed by the sample is picked up by a sharpened optical fibre probe. By this experimental arrangement Raman scattering from the optical fibre probe was greatly reduced, therefore we were able to excite the sample using more intense laser light compared to the illumination mode SNOM. Raman spectra of copper phthalocyanine (CuPc) were obtained in the off-resonance condition and without using surface-enhanced Raman scattering (SERS).
Takahashi
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Joint Research Center for Atom Technology-Angstrom Technology Partnership, National Institute for Advanced Interdisciplinary Research, Tsukuba, Ibaraki, Japan. takasa@jrcat.or.jp
Futamata
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Kojima
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