中国物理B ›› 2008, Vol. 17 ›› Issue (10): 3880-3893.doi: 10.1088/1674-1056/17/10/055

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Surface plasmon polariton and mode transformation in a nanoscale lossy metallic cylindrical cable

杨鹏飞, 古 英, 龚旗煌   

  1. State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2008-04-03 出版日期:2008-10-20 发布日期:2008-10-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10674009, 10521002 and 10434020) and the National Key Development Program for Basic Research of China (Grant No 2007CB307001).

Surface plasmon polariton and mode transformation in a nanoscale lossy metallic cylindrical cable

Yang Peng-Fei(杨鹏飞), Gu Ying(古英)†, and Gong Qi-Huang(龚旗煌)‡   

  1. State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
  • Received:2008-04-03 Online:2008-10-20 Published:2008-10-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10674009, 10521002 and 10434020) and the National Key Development Program for Basic Research of China (Grant No 2007CB307001).

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摘要： A theoretical investigation on the surface plasmon polariton in a gold cylindrical nanocable is presented. By solving a complete set of Maxwell's equations in the nanocable (with a $50$\,nm radius gold nanocore, 10--300\,nm silica layer, and 30--200\,nm gold nanocladding), the dispersion relations on the optical frequency and on the silica thickness are discussed. When the silica thickness varies from $50$ to $250$\,nm, at a fixed wavelength, the strong coupling between the gold nanocore and the nanocladding leads to a symmetric-like surface mode and an antisymmetric-like surface mode in the nanocable. The transformation between the surface mode and the waveguide mode in this structure is also investigated. The results will be helpful for understanding the surface waves in the subwavelength structures.

关键词: nanocable, surface plasmons, mode transformation

Abstract: A theoretical investigation on the surface plasmon polariton in a gold cylindrical nanocable is presented. By solving a complete set of Maxwell's equations in the nanocable (with a $50$ nm radius gold nanocore, 10--300 nm silica layer, and 30--200 nm gold nanocladding), the dispersion relations on the optical frequency and on the silica thickness are discussed. When the silica thickness varies from $50$ to $250$ nm, at a fixed wavelength, the strong coupling between the gold nanocore and the nanocladding leads to a symmetric-like surface mode and an antisymmetric-like surface mode in the nanocable. The transformation between the surface mode and the waveguide mode in this structure is also investigated. The results will be helpful for understanding the surface waves in the subwavelength structures.

Key words: nanocable, surface plasmons, mode transformation

中图分类号:  (Polaritons (including photon-phonon and photon-magnon interactions))

  • 71.36.+c
73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)) 73.22.Lp (Collective excitations) 61.46.-w (Structure of nanoscale materials) 42.82.Et (Waveguides, couplers, and arrays)