Localized Hybrid Plasmon Modes Reversion in Gold鈥揝ilica鈥揋old Multilayer Nanoshells

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• 作者：Jun Qian ; Yudong Li ; Jing Chen ; Jingjun Xu ; Qian Sun
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 24, 2014
• 年：2014
• 卷：118
• 期：16
• 页码：8581-8587
• 全文大小：378K
• 年卷期：v.118,no.16(April 24, 2014)
• ISSN：1932-7455

文摘

The plasmon hybridization theory is widely used to study the plasmon response of metallic nanostructures. In this work, we study the plasmon hybridization picture of the gold鈥搒ilica鈥揼old multilayer nanoshells from the viewpoint of the optical extinction spectrum and the charge density distribution. We find that reducing the distance between the Au core and the Au shell causes the conversion from |蠅_{鈥?/sub>⁺ to |蠅+^{鈥?/sup> modes of the high energy extinction peak. According to our opinion, it is because the increased plasmon interaction between the Au core and the Au shell induces the energy reversion of the |蠅鈥?/sub>+ and |蠅+鈥?/sup> plasmon modes. The interesting contrary shift effect of the high energy extinction peaks with different dielectric constants of the middle silica shell and outer surrounding is well-explained by the |蠅+鈥?/sup> modes. The energy reversion of hybrid plasmon modes we reported would give new insight into the plasmon hybridization theory. Moreover, our study could offer a modified way based on the charge interaction analysis, which is a necessary supplement to the plasmon hybridization theory, for studying plasmon responses in the optical spectrum of metal nanostructures.}}