Applied Physics B

, Volume 96, Issue 4, pp 821–826

Second-harmonic generation spectroscopy on organic nanofibers

Authors

    • Department of Physics and NanotechnologyAalborg University
  • M. Schiek
    • NanoSYD, Mads Clausen InstituteUniversity of Southern Denmark
  • J. Rafaelsen
    • Department of Physics and NanotechnologyAalborg University
  • H.-G. Rubahn
    • NanoSYD, Mads Clausen InstituteUniversity of Southern Denmark
Article

DOI: 10.1007/s00340-009-3688-4

Cite this article as:
Pedersen, K., Schiek, M., Rafaelsen, J. et al. Appl. Phys. B (2009) 96: 821. doi:10.1007/s00340-009-3688-4

Abstract

Optical second-harmonic generation upon nanosecond laser irradiation of nanofibers grown from nonsymmetrically functionalized para-quarter-phenylene molecules on mica surfaces is investigated in the spectral region around electronic resonances. Strong multiphoton excited luminescence appears together with the second-harmonic signal in the spectra. It is demonstrated how the two components can be separated by analyzing emission spectra recorded over a broad range of wavelengths around the second-harmonic energy. Spectra of the absolute values of the second-harmonic signals are obtained for three differently functionalized molecules. Together with supplementary measurements of the structure of the nanofiber films this forms the basis for estimation of the second-harmonic susceptibility of the fiber materials. Values of the nonlinear susceptibilities are obtained, which are comparable to those of well-known inorganic nonlinear optical crystals.

PACS

42.65.Ky78.55.Kz72.80.Le81.07.-b

Copyright information

© Springer-Verlag 2009