Preparation of Gold Nanopairs and Their Third-Order Nonlinear Optical Properties

Yong Yang*, Zhengren Huang, Shigemasa Matsubara, Masayuki Nogami

Abstract: Chainlike structures of metal nanoparticles have been widely studied because the local field effects can be enhanced several orders of magnitude in the metal chainlike aggregated structure and are responsible for the enhanced SERS signals and enhanced third-order optical nonlinear response. Here we prepared gold nanopairs by adjusting the concentration of cetyltrimethylammonium bromide (CTAB) and 11-mercaptoundecanoic (MUA). The aggregation behavior and linear self-assembly mechanism of citrate-stabilized gold colloids as provoked by the addition of cetyltrimethylammonium bromide (CTAB) and MUA are also analyzed. The gold nanopairs are also self-assembled on glass substrates and their third-order optical nonlinear properties were studied. The nonlinear optical response in SiO2-coated gold nanopairs was found to be enhanced by two orders of magnitude than SiO2-coated single gold nanoparticles.

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