中国物理B ›› 2014, Vol. 23 ›› Issue (2): 27303-027303.doi: 10.1088/1674-1056/23/2/027303

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High-order plasmon resonances in an Ag/Al2O3 core/shell nanorice

陈立a b, 魏红b, 陈克求a, 徐红星b c   

  1. a Department of Applied Physics, Hunan University, Changsha 410082, China;
    b Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    c Center for Nanoscience and Nanotechnology, and School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • 收稿日期:2013-08-20 修回日期:2013-09-18 出版日期:2013-12-12 发布日期:2013-12-12
  • 基金资助:
    Project supported by the National Key Basic Research and Development Program of China (Grant Nos. 2009CB930700 and 2012YQ12006005), the National Natural Science Foundation of China (Grant Nos. 11134013, 11227407, and 11004237), and the Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No. KJCX2-EW-W04).

High-order plasmon resonances in an Ag/Al2O3 core/shell nanorice

Chen Li (陈立)a b, Wei Hong (魏红)b, Chen Ke-Qiu (陈克求)a, Xu Hong-Xing (徐红星)b c   

  1. a Department of Applied Physics, Hunan University, Changsha 410082, China;
    b Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    c Center for Nanoscience and Nanotechnology, and School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • Received:2013-08-20 Revised:2013-09-18 Online:2013-12-12 Published:2013-12-12
  • Contact: Xu Hong-Xing E-mail:hxxu@iphy.ac.cn
  • About author:73.20.Mf; 78.67.-n; 42.25.-p
  • Supported by:
    Project supported by the National Key Basic Research and Development Program of China (Grant Nos. 2009CB930700 and 2012YQ12006005), the National Natural Science Foundation of China (Grant Nos. 11134013, 11227407, and 11004237), and the Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No. KJCX2-EW-W04).

摘要: Using numerical simulation, we investigate the high-order plasmon resonances in individual nanostructures of an Ag nanorice core surrounded by an Al2O3 shell. The peak positions of localized surface plasmon resonances (LSPRs) are red-shifted exponentially with the increase of the dielectric shell thickness. This is due to the exponential decay of electromagnetic field intensity in the direction perpendicular to the interface. This exponential red-shift depends on the wavelength of the resonance peak instead of the resonance order. In addition, we find that the LSPRs in an Ag nanorice of 60-nm width can be perfectly described by a single linear function. These features make nanorice an ideal platform for sensing applications.

关键词: localized surface plasmon resonances, nanorice, core-shell, LSPR sensing

Abstract: Using numerical simulation, we investigate the high-order plasmon resonances in individual nanostructures of an Ag nanorice core surrounded by an Al2O3 shell. The peak positions of localized surface plasmon resonances (LSPRs) are red-shifted exponentially with the increase of the dielectric shell thickness. This is due to the exponential decay of electromagnetic field intensity in the direction perpendicular to the interface. This exponential red-shift depends on the wavelength of the resonance peak instead of the resonance order. In addition, we find that the LSPRs in an Ag nanorice of 60-nm width can be perfectly described by a single linear function. These features make nanorice an ideal platform for sensing applications.

Key words: localized surface plasmon resonances, nanorice, core-shell, LSPR sensing

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures) 42.25.-p (Wave optics)