Spectral mapping of the third-order optical nonlinearity of glass-metal nanocomposites.
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.
Halonen
Mikko
M
Department of Physics and Mathematics, University of Joensuu, P.O.Box 111 Joensuu, 8010, Finland.
Lipovskii
Andrey
A
Zhurikhina
Valentina
V
Lyashenko
Dmitry
D
Svirko
Yuri
Y