Coherent anti-Stokes Raman scattering under electric field stimulation

Erwan Capitaine, Nawel Ould Moussa, Christophe Louot, Claire Lefort, Dominique Pagnoux, Jean René Duclère, Junya F. Kaneyasu, Hideaki Kano, Ludovic Duponchel, Vincent Couderc, Philippe Leproux

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

We introduce an experiment using electro-CARS, an electro-optical method based on the combination of ultrabroadband multiplex coherent anti-Stokes Raman scattering (M-CARS) spectroscopy and electric field stimulation. We demonstrate that this method can effectively discriminate the resonant CARS signal from the nonresonant background owing to a phenomenon of molecular orientation in the sample medium. Such molecular orientation is intrinsically related to the induction of an electric dipole moment by the applied static electric field. Evidence of the electro-CARS effect is obtained with a solution of n-alkanes (CnH2n+2, 15≤n≤40), for which an enhancement of the CARS signal-to-noise ratio is achieved in the case of CH2 and CH3 symmetric/asymmetric stretching vibrations. Additionally, an electric-field-induced second-harmonic generation experiment is performed in order to corroborate the orientational organization of molecules due to the electric field excitation. Finally, we use a simple mathematical approach to compare the vibrational information extracted from electro-CARS measurements with spontaneous Raman data and to highlight the impact of electric stimulation on the vibrational signal.

本文言語英語
論文番号245136
ジャーナルPhysical Review B
94
24
DOI
出版ステータス出版済み - 12 27 2016
外部発表はい

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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