Dispersion of nonlinear dielectric function of Au nanoparticles in silica glass.
We have investigated wavelength dispersion of photo-induced nonlinear dielectric function of Au nanoparticle materials. Transient transmission and reflection spectra were sequentially measured by the pump-probe method with a femtosecond laser system. The dispersion of real and imaginary parts of the nonlinear dielectric function of Au:SiO(2) nanoparticle material in the vicinity of the surface plasmon resonance was evaluated from these transient spectra with total differential. A local electromagnetic field factor and interband transition in Au nanoparticles directly dominate the dispersion.
Takeda
Yoshihiko
Y
Quantum Beam Center, National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan. TAKEDA.Yoshihiko@nims.go.jp
Plaksin
Oleg A
OA
Kishimoto
Naoki
N