Third-order optical nonlinearity of gold nanoparticle arrays embedded in a BaTiO3 matrix.
Au:BaTiO(3) composite films comprising hexagon-shaped Au nanoparticle arrays covered with BaTiO(3) matrix were fabricated by double-layer nanosphere lithography and pulsed laser deposition technique. The optical nonlinearity of the composite film was determined using the Z-scan technique at a wavelength of 532 nm and a pulse duration of 25 ps. The third-order nonlinear optical susceptibility, chi(3), was found to be 2.9x10(-8) esu, which is comparable with the best values in metal-dielectric films comprising randomly distributed spherical particles but with much higher metal concentrations. The local electric field enhancement in and near the particles was investigated using the dipole discrete approximation method.
Ning
Tingyin
T
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Chen
Chunchong
C
Zhou
Yueliang
Y
Lu
Heng
H
Shen
Hong
H
Zhang
Dongxiang
D
Wang
Pei
P
Ming
Hai
H
Yang
Guozhen
G