Spectroscopy with scanning near-field optical microscopy using photon tunnelling mode

We have demonstrated Raman spectroscopy using scanning near-field optical m icroscopy (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 op tical fibre probe. By this experimental arrangement Raman scattering from t he optical fibre probe was greatly reduced, therefore we were able to excit e the sample using moro intense laser light compared to the illumination mo de SNOM, Raman spectra of copper phthalocyanine (CuPc) were obtained in the off-resonance condition and without using surface-enhanced Raman scatterin g (SERS).