Surface-enhanced resonance Raman scattering spectroscopy of single R6G molecules
Zhou Zeng-Hui (周增会)ab, Liu Li (刘力)a, Wang Gui-Ying (王桂英)a, Xu Zhi-Zhan (徐至展)a
a State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Shanghai 201800, China; b Graduate School of The Chinese Academy of Sciences, Beijing 100039, China
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.
Received: 12 January 2005
Revised: 30 May 2005
Accepted manuscript online:
Fund: Project supported by the National Key Basic Research and Development Programme of China (Grant No 2002CB713808).
Cite this article:
Zhou Zeng-Hui (周增会), Liu Li (刘力), Wang Gui-Ying (王桂英), Xu Zhi-Zhan (徐至展) Surface-enhanced resonance Raman scattering spectroscopy of single R6G molecules 2006 Chinese Physics 15 126
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