中国物理B ›› 2011, Vol. 20 ›› Issue (1): 14206-014206.doi: 10.1088/1674-1056/20/1/014206

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Simultaneous measurements of global vibrational spectra and dephasing times of molecular vibrational modes by broadband time-resolved coherent anti-Stokes Raman scattering spectrography

尹君, 于凌尧, 刘星, 万辉, 林子扬, 牛憨笨   

  1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Optoelectronics, Shenzhen University, Shenzhen 518060, China
  • 收稿日期:2010-07-19 修回日期:2010-08-25 出版日期:2011-01-15 发布日期:2011-01-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 60627003) and the Foundation for Creative Team in Institution of Higher Education of Guangdong Province, China (Grant No. 06CXTD009).

Simultaneous measurements of global vibrational spectra and dephasing times of molecular vibrational modes by broadband time-resolved coherent anti-Stokes Raman scattering spectrography

Yin Jun(尹君), Yu Ling-Yao(于凌尧), Liu Xing(刘星), Wan Hui(万辉), Lin Zi-Yang(林子扬), and Niu Han-Ben(牛憨笨)†   

  1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Institute of Optoelectronics, Shenzhen University, Shenzhen 518060, China
  • Received:2010-07-19 Revised:2010-08-25 Online:2011-01-15 Published:2011-01-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 60627003) and the Foundation for Creative Team in Institution of Higher Education of Guangdong Province, China (Grant No. 06CXTD009).

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摘要： In broadband coherent anti-Stokes Raman scattering (CARS) spectroscopy with supercontinuum (SC), the simultaneously detectable spectral coverage is limited by the spectral continuity and the simultaneity of various spectral components of SC in an enough bandwidth. By numerical simulations, the optimal experimental conditions for improving the SC are obtained. The broadband time-resolved CARS spectrography based on the SC with required temporal and spectral distributions is realised. The global molecular vibrational spectrum with well suppressed nonresonant background noise can be obtained in a single measurement. At the same time, the measurements of dephasing times of various molecular vibrational modes can be conveniently achieved from intensities of a sequence of time-resolved CARS signals. It will be more helpful to provide a complete picture of molecular vibrations, and to exhibit a potential to understand not only both the solvent dynamics and the solute-solvent interactions, but also the mechanisms of chemical reactions in the fields of biology, chemistry and material science.

Abstract: In broadband coherent anti-Stokes Raman scattering (CARS) spectroscopy with supercontinuum (SC), the simultaneously detectable spectral coverage is limited by the spectral continuity and the simultaneity of various spectral components of SC in an enough bandwidth. By numerical simulations, the optimal experimental conditions for improving the SC are obtained. The broadband time-resolved CARS spectrography based on the SC with required temporal and spectral distributions is realised. The global molecular vibrational spectrum with well suppressed nonresonant background noise can be obtained in a single measurement. At the same time, the measurements of dephasing times of various molecular vibrational modes can be conveniently achieved from intensities of a sequence of time-resolved CARS signals. It will be more helpful to provide a complete picture of molecular vibrations, and to exhibit a potential to understand not only both the solvent dynamics and the solute-solvent interactions, but also the mechanisms of chemical reactions in the fields of biology, chemistry and material science.

Key words: coherent anti-Stokes Raman scattering, photonic crystal fibre, supercontinuum, molecular vibrational spectrum, dephasing time, time-resolved measurement

中图分类号:  (Stimulated Raman scattering; CARS)

  • 42.65.Dr
42.70.Qs (Photonic bandgap materials)