title: Growth of metal-semiconductor core-multishell nanorods with optimized field confinement and nonlinear enhancement.
abstract: This paper describes a facile method for the synthesis of Au/AuAg/Ag2S/PbS core-multishell nanorods with double trapping layers. The synthesis, in sequence, involved deposition of Ag shells onto the surfaces of Au nanorod seeds, formation of AuAg shells by a galvanic replacement reaction, and overgrowth of the Ag2S shells and PbS shells. The resulting core-multishell nanorod possesses an air gap between the Au core and the AuAg shell. Together with the Ag2S shell, the air gap can efficiently trap light, causing strong field confinement and nonlinear enhancement. The as-prepared Au/AuAg/Ag2S/PbS core-multishell nanorods display distinct localized surface plasmon resonance and nonlinear optical properties, demonstrating an effective pathway for maneuvering the optical properties of nanocavities.
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn.
authors.forename: Fan
authors.initials: F
authors.lastname: Nan
authors.affiliation: School of the Gifted Young, University of Science and Technology of China, Hefei 230026, Anhui, P. R. China.
authors.forename: Fang-Ming
authors.initials: FM
authors.lastname: Xie
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn and Department of Physics, Hunan Normal University, Changsha 410081, P. R. China.
authors.forename: Shan
authors.initials: S
authors.lastname: Liang
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn.
authors.forename: Liang
authors.initials: L
authors.lastname: Ma
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn.
authors.forename: Da-Jie
authors.initials: DJ
authors.lastname: Yang
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn.
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Liu
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn.
authors.forename: Jia-Hong
authors.initials: JH
authors.lastname: Wang
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn.
authors.forename: Zi-Qiang
authors.initials: ZQ
authors.lastname: Cheng
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn.
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Yu
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn.
authors.forename: Li
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn zhouli@whu.edu.cn and The Institute for Advanced Studies, Wuhan University, Wuhan 430072, P. R. China.
authors.forename: Qu-Quan
authors.initials: QQ
authors.lastname: Wang
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, Anhui, P. R. China. zengj@ustc.edu.cn.
authors.forename: Jie
authors.initials: J
authors.lastname: Zeng