title: Spectral mapping of the third-order optical nonlinearity of glass-metal nanocomposites.
abstract: By tuning wavelengths of the femtosecond pump and probe pulses we mapped the nonlinear absorption of copper-glass nanocomposites within 520-620 nm range. At the pump intensity of 3 GW/cm(2), the induced transmission rise was as high as 20%. The imaginary part of the third-order optical susceptibility of the nanocomposites as a function of the probe wavelength reproduced well the spectral profile of the surface plasmon resonance in copper. In contrast, the imaginary part of the third-order optical susceptibility as a function of the pump wavelength did not reproduce the plasmon profile being wider than the latter.
authors.affiliation: Department of Physics and Mathematics, University of Joensuu, P.O.Box 111 Joensuu, 8010, Finland.
authors.forename: Mikko
authors.initials: M
authors.lastname: Halonen
authors.forename: Andrey
authors.initials: A
authors.lastname: Lipovskii
authors.forename: Valentina
authors.initials: V
authors.lastname: Zhurikhina
authors.forename: Dmitry
authors.initials: D
authors.lastname: Lyashenko
authors.forename: Yuri
authors.initials: Y
authors.lastname: Svirko