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Cascaded coherent Stokes Raman scattering in LiNbO3 : Mg crystals under excitation of small polarons and phonon polaritonsстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Kitaeva G.K., Kuznetsov K.A., Penin A.N., Solosin S.V.
- Журнал: Journal of Raman Spectroscopy
- Том: 33
- Номер: 11-12
- Год издания: 2002
- Издательство: John Wiley & Sons Inc.
- Местоположение издательства: United States
- Первая страница: 941
- Последняя страница: 947
- DOI: 10.1002/jrs.947
- Аннотация: Dispersion of the real epsilon'(nu) and the imaginary epsilon"(nu) parts of the dielectric function was measured by means of cascaded coherent Stokes Raman scattering (CSRS), in the spectral region of phonon polaritons 520-560cm(-1), for single crystals of LiNbO3:Mg, before and after chemical reduction of the samples. Comparison with the results obtained by spontaneous near-forward Raman scattering showed that the excitation of polaritons under CSRS does not cause any changes in the dielectric function of the unreduced crystal. After the reduction, which leads to the formation of localized charge carriers, small polarons, we found a sufficient increase in the dielectric function imaginary part, measured by CSRS. This reduction-induced increase reaches its maximum values in the region of Fermi resonance between polariton and biphonon states. The possible origin of this effect, connected with the enhancement of the lattice intermolecular anharmonicity under polaron hopping, is discussed. Copyright (C) 2002 John Wiley Sons, Ltd.
- Добавил в систему: Китаева Галия Хасановна