Nanoscale Energy Confinement and Hybridization of Surface Plasmons Based on Skin Depth in Au/Ag Core-Shell Nanostructures

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• 作者：Xi-bin Xu ; Miao Liu ; Jiang-shan Luo ; Yu-ying Wang ; Zao Yi ; Xi-bo Li…
• 关键词：Skin depth ; Surface plasmon ; Energy confinement ; Plasmom hybridization
• 刊名：Plasmonics
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：10
• 期：4
• 页码：797-808
• 全文大小：6,485 KB
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• 作者单位：Xi-bin Xu (1) (2) (3)
  Miao Liu (2) (3)
  Jiang-shan Luo (2)
  Yu-ying Wang (1) (2) (3)
  Zao Yi (1) (2)
  Xi-bo Li (2) (3)
  You-gen Yi (1)
  Yong-jian Tang (2)
  
  1. College of Physics and Electronics, Central South University, Changsha, 410083, China
  2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China
  3. Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Nanotechnology
  Biophysics and Biomedical Physics
  Biochemistry
  
• 出版者：Springer US
• ISSN：1557-1963

文摘

The electric field tends to become distributed within a conductor due to skin effect such that the field density is largest near the surface of the conductor and decreases with greater depths in the conductor. The electric field mainly distributes at the skin of the conductor, between the outer surface and a level called the skin depth. For a plasmonic nanosystem smaller than the skin depth, oscillations of the metal electrons will be driven by the optical electric field penetrating the entire system. This effect will induce confinement of optical energy inside the whole systems and influence the performance of surface plasmon. A theoretical model that a gold core is embedded within Ag nanoshell is constructed to simulate hybridization of surface plasmon and energy confinement in Au/Ag core/shell nanostructures based on the skin depth. Indeed, nanoshells in the core/shell system greatly influence the surface plasmon resonance, and the shell frequency is tuned efficiently through hybridization of surface plasmon. The plasmon resonances in core/shell particles can be understood in terms of hybridization between the plasmon modes of the surfaces and interfaces supported by cavity of the metallic shells. The hybridized plasmons induced by interaction of these plasmon modes can result in energy alteration over a wide range in wavelength. Combining with extinction spectra and field distributions, it can be seen that skin depth plays an important role in energy confinement and hybridization of surface plasmom.