Surface-enhanced resonance Raman scattering spectroscopy of single R6G molecules |
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| Authors: | Zhou Zeng-Hui Liu Li Wang Gui-Ying and Xu Zhi-Zhan |
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| Affiliation: | State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Shanghai 201800, China; Graduate School of The Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | Surface-enhanced resonance Raman scattering (SERRS) of
Rhodamine 6G (R6G) adsorbed on colloidal silver clusters has been studied.
Based on the great enhancement of the Raman signal and the quench of the
fluorescence, the SERRS spectra of R6G were recorded for the samples of dye
colloidal solution with different concentrations. Spectral inhomogeneity
behaviours from single molecules in the dried sample films were observed with
complementary evidences, such as spectral polarization, spectral diffusion,
intensity fluctuation of vibrational lines and even ``breathing' of the
molecules. Sequential spectra observed from a liquid sample with an average of
0.3 dye molecules in the probed volume exhibited the expected Poisson
distribution for actually measuring 0, 1 or 2 molecules. Difference between
the SERRS spectra of R6G excited by linearly and circularly polarized light
were experimentally measured. |
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| Keywords: | single-molecule spectroscopy surface-enhanced resonance Raman scattering spectral polarization Poisson distribution |
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