Subwavelength Raman spectroscopy
作者:
J. Grausem,
B. Humbert,
A. Burneau,
J. Oswalt,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 13
页码: 1671-1673
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.118665
出版商: AIP
数据来源: AIP
摘要:
Near-field Raman spectroscopy has been performed on liquid CCl4. The spectrum, obtained through an aperture significantly smaller(&lgr;/10)than the exciting wavelength (514.5 nm) with a good signal-to-noise ratio, presents polarization effects that are different from the far-field spectrum. The tip is shown to be polarized at 99.9&percent; by the Raman near field. If the probe is modeled as a single dielectric sphere, the estimated Raman near-field amplitude amounts to about103V m−1. The frustration of the Raman near field by the probe allows to record the Raman spectrum of only 0.4 attomol, or 240 000 mol. ©1997 American Institute of Physics.
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