中国物理B ›› 2006, Vol. 15 ›› Issue (1): 126-131.doi: 10.1088/1009-1963/15/1/020

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Surface-enhanced resonance Raman scattering spectroscopy of single R6G molecules

刘力1, 王桂英1, 徐至展1, 周增会2   

  1. (1)State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Shanghai 201800, China; (2)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
  • 收稿日期:2005-01-12 修回日期:2005-05-30 出版日期:2006-01-20 发布日期:2006-01-20
  • 基金资助:
    Project supported by the National Key Basic Research and Development Programme of China (Grant No 2002CB713808).

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   

  1. 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
  • Received:2005-01-12 Revised:2005-05-30 Online:2006-01-20 Published:2006-01-20
  • Supported by:
    Project supported by the National Key Basic Research and Development Programme of China (Grant No 2002CB713808).

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摘要： 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.

关键词: single-molecule spectroscopy, surface-enhanced resonance Raman scattering, spectral polarization, Poisson distribution

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.

Key words: single-molecule spectroscopy, surface-enhanced resonance Raman scattering, spectral polarization, Poisson distribution

中图分类号: 

  • 78.30.Cp
82.70.Gg (Gels and sols)