P409
Raman Spectra Using Scanning Near-Field Optical Microscopy
Satoshi Takahashi, Masayuki Futamata*
JRCAT-ATP, *JRCAT-NAIR
Scanning near-field optical microscopy (SNOM) has been applied to Raman
spectroscopy, and spectra of copper phthalocyanine (CuPc) have been obtained
without using
surface-enhanced Raman scattering effects, and under off-resonance condition
. We used attenuated
total reflection (ATR) configuration, in which the sample on a prism is expo
sed to the evanescent
field generated by the total internal reflection of incident laser light, an
d the perturbated evanescent
wave by the sample is picked up with an sharpened optical fiber probe. We h
ave experimentally
confirmed that the ATR arrangement has three advantages compared to the conv
entional SNOM
in whch the sample is illuminated by light launched from an small aperture:(
1) The Raman
scattering or fluorescence from the SNOM probe itself is significantly small
, (2) It is possible to
illuminate the sample with an excitation power of more than 10 mW without da
maging the tip, and
(3) Owing to less stray light an uncoated optical fiber probe can be used.
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