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Optical Properties of Cu Nanocrystalline―OPAA Composite Film

Author(s): LIU Yan, YANG Xiu-Chun, ZHOU Hui, HOU Jun-Wei, HAN Shan-Shan, QIAN Shi-Xiong

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 9;
Start page: 907;
Date: 2011;
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Keywords: ordered porous anodic alumina; Cu nanocrystalline; third-order optical nonlinearity

Optically transparent Cu nanocrystalline/OPAA composite film was successfully prepared by electrodepositing Cu into ordered porous anodic alumina (OPAA) template using constant voltage direct current technique. The morphology, structure, linear optical absorption, third―order optical nonlinearity and ultrafast dynamics of the Cu/OPAA composite were characterized by field emission scanning electron microscope (FESEM), transmission electron microscope (TEM). UV―Vis spectrophotometer, Z―scan technique and femtosecond pump―probe experiment. The results show that Cu nanoparicles have diameters of 40–50nm with face center cubic structure and disperse in the branched pores of the OPAA template, which induce a surface plasmon resonance (SPR) absorption at 584 nm. When the probe optical wavelength is far away from the SPR wavelength, Cu nanocrystalline/OPAA composite film possesses a character of light―induced absorption. When the probe optical wavelength is near the SPR wavelength, it possesses a photo―bleaching character. The composite film has a non―resonant third―order nonlinear susceptibility of 0.73×10―9 esu and a response time of 1.3 ps.
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