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Vol. 6 No. 4 (2014)

Angle-Resolved Plasmonic Properties of Single Gold Nanorod Dimers

https://doi.org/10.1007/s40820-014-0011-7
Jian Wu
Department of Physics and Astronomy, Key Laboratory for Laser Plasmas (Ministry of Education), State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Xuxing Lu
Division of i-Lab, Key Laboratory for Nano-Bio Interface Research & Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech & Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu, People’s Republic of China
Qiannan Zhu
Division of i-Lab, Key Laboratory for Nano-Bio Interface Research & Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech & Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu, People’s Republic of China
Junwei Zhao
Division of i-Lab, Key Laboratory for Nano-Bio Interface Research & Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech & Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu, People’s Republic of China
Qishun Shen
Department of Physics and Astronomy, Key Laboratory for Laser Plasmas (Ministry of Education), State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Li Zhan
Department of Physics and Astronomy, Key Laboratory for Laser Plasmas (Ministry of Education), State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Weihai Ni
Division of i-Lab, Key Laboratory for Nano-Bio Interface Research & Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech & Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu, People’s Republic of China

Corresponding Author: Weihai Ni

whni2012@sinano.ac.cn

Nano-Micro Letters, Vol. 6 No. 4 (2014), Article Number: 372-380

Abstract

Through wet-chemical assembly methods, gold nanorods were placed close to each other and formed a dimer with a gap distance ~1 nm, and hence degenerated plasmonic dipole modes of individual nanorods coupled together to produce hybridized bonding and antibonding resonance modes. Previous studies using a condenser for illumination result in averaged signals over all excitation angles. By exciting an individual dimer obliquely at different angles, we demonstrate that these two new resonance modes are highly tunable and sensitive to the angle between the excitation polarization and the dimer orientation, which follows cos2φ dependence. Moreover, for dimer structures with various structure angles, the resonance wavelengths as well as the refractive index sensitivities were found independent of the structure angle. Calculated angle-resolved plasmonic properties are in good agreement with the measurements. The assembled nanostructures investigated here are important for fundamental researches as well as potential applications when they are used as building blocks in plasmon-based optical and optoelectronic devices.

Keywords

Plasmonics Gold nanorods Self-assembly
Wu, Jian, Xuxing Lu, Qiannan Zhu, Junwei Zhao, Qishun Shen, Li Zhan, and Weihai Ni. 2014. “Angle-Resolved Plasmonic Properties of Single Gold Nanorod Dimers”. Nano-Micro Letters 6 (4):372-80. https://doi.org/10.1007/s40820-014-0011-7.
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