Fabrication of ultrathin films with large third-order nonlinear optical properties.
An ultrathin composite film containing anionic Ag-His complexes (His: L-Histidine) and oppositely charged BH-PPV was fabricated by means of the electrostatic layer-by-layer self-assembly technique. UV/Vis spectra showed a continuous deposition process of Ag-His complexes and BH-PPV. The film structure was characterized by using small-angle X-ray diffraction, AFM, and SEM. The nonlinear optical properties of the ultrathin film were studied by using the Z-scan technique with a laser duration of 8 ns at a wavelength of 532 nm. The film sample exhibited a strong nonlinear saturated absorption, with an alpha2 value of -3.9 x 10(-5) mW(-1) and a self-defocusing effect with an n2 value of -4.78 x 10 (-12) m2W(-1).
Jiang
Li
L
CAS Key Laboratory of Organic Solids, Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China.
Lu
Fushen
F
Chang
Qing
Q
Liu
Yang
Y
Liu
Huibiao
H
Li
Yuliang
Y
Xu
Wei
W
Cui
Guanglei
G
Zhuang
Junpeng
J
Li
Xiaofang
X
Wang
Shu
S
Song
Yinglin
Y
Zhu
Daoben
D