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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 17, Iss. 2 — Feb. 1, 2000
  • pp: 256–265

Fourier analysis of the femtosecond hyper-Rayleigh scattering signal from ionic fluorescent hemicyanine dyes

Koen Clays, Kurt Wostyn, Geert Olbrechts, André Persoons, Akira Watanabe, Kyoko Nogi, Xuan-Ming Duan, Shuji Okada, Hidetoshi Oikawa, Hachiro Nakanishi, Henryk Vogel, David Beljonne, and Jean-Luc Brédas  »View Author Affiliations


JOSA B, Vol. 17, Issue 2, pp. 256-265 (2000)
http://dx.doi.org/10.1364/JOSAB.17.000256


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Abstract

A series of five fluorescent and ionic dimethylamino stilbazolium homologues with increasing conjugation length (from ethenyl to decapentaenyl) is investigated by high-frequency, amplitude-modulated femtosecond hyper-Rayleigh scattering at 1300 nm. A hyperpolarizability value that is not overestimated by the presence of a multiphoton fluorescence contribution is obtained from the Fourier analysis of the hyper-Rayleigh scattering signal. The demodulation curve (decrease of Fourier amplitude versus modulation frequency) is characterized by both the hyperpolarizability value and the fluorescence decay parameters. The fluorescence decay parameters are accurately determined independently by single-photon counting. A detailed analysis of the fluorescence decay parameters from the hyper-Rayleigh scattering demodulation curve and of their relation to the fluorescence decay parameters obtained from single-photon counting experiments is presented. The inherent hyperpolarizability value for these chromophores shows a maximum of (2045±35) 10−30 esu or (760±13)×10−50 C3 m3 J−2 for the hexatrienyl conjugation length. A comparison with theoretical calculations suggests the importance of trans–cis isomerization in the excited state.

© 2000 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(160.4890) Materials : Organic materials
(190.0190) Nonlinear optics : Nonlinear optics
(190.4180) Nonlinear optics : Multiphoton processes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(290.5870) Scattering : Scattering, Rayleigh

Citation
Koen Clays, Kurt Wostyn, Geert Olbrechts, André Persoons, Akira Watanabe, Kyoko Nogi, Xuan-Ming Duan, Shuji Okada, Hidetoshi Oikawa, Hachiro Nakanishi, Henryk Vogel, David Beljonne, and Jean-Luc Brédas, "Fourier analysis of the femtosecond hyper-Rayleigh scattering signal from ionic fluorescent hemicyanine dyes," J. Opt. Soc. Am. B 17, 256-265 (2000)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-17-2-256

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