Anomalous behavior of the second and third harmonics generated by femtosecond Cr:forsterite laser pulses in SiC-polymer nanocomposite materials as functions of the SiC nanopowder content

S.O. Konorov, D.A. Akimov, A.A. Ivanov, M.V. Alfimov, S.V. Zabotnov, D.A. Sidorov-Biryukov, A.B. Fedotov, A.A. Podshivalov, L. Fornarini, M. Carpanese, M. Avella, M.E. Errico, R. Fantoni, A.M. Zheltikov

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8 Citations (Scopus)

Abstract

Femtosecond pulses of 1.25 μm Cr:forsterite laser radiation were used to study second- and third-harmonic generation in silicon carbide nanopowders embedded in a poly(methyl methacrylate) (PMMA) film. Harmonic generation processes extend the analytical and sensing abilities of light-scattering techniques, including Raman spectroscopy, offering a convenient and efficient approach to the analysis of nanocomposite materials where nanoparticles tend to agglomerate, masking informative features in Raman spectra. The second- and third-harmonic yields are shown to display an anomalous, counterintuitive behavior as functions of the SiC nanopowder content in a polymer film. Whereas harmonic generation in polymer films with a high content of SiC nanocrystals is quenched by the absorption of agglomerating nanoparticles, the influence of absorption is less detrimental in nanocomposite films with a lower SiC content, leading to the growth of the second- and third-harmonic yields. Nanocomposite films with a lower SiC content are also characterized by a higher breakdown threshold, allowing pump pulses with higher fluences to be applied for more efficient harmonic generation. Copyright © 2003 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)999 - 1006
Number of pages8
JournalJournal of Raman Spectroscopy
Volume34
Issue number12
DOIs
Publication statusPublished - Dec 2003
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Spectroscopy

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