中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2567-2573.doi: 10.1088/1674-1056/17/7/038

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

A visible-near infrared tunable waveguide based on plasmonic gold nanoshell

张海汐, 古英, 龚旗煌   

  1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2007-12-25 修回日期:2008-01-29 出版日期:2008-07-09 发布日期:2008-07-09
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grants Nos 10674009, 10521002 and 10434020) and the National Key Basic Research Program of China (Grant No 2007CB307001).

A visible-near infrared tunable waveguide based on plasmonic gold nanoshell

Zhang Hai-Xi(张海汐), Gu Ying(古英)†, and Gong Qi-Huang(龚旗煌)‡   

  1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China
  • Received:2007-12-25 Revised:2008-01-29 Online:2008-07-09 Published:2008-07-09
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grants Nos 10674009, 10521002 and 10434020) and the National Key Basic Research Program of China (Grant No 2007CB307001).

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摘要： A tunable plasmonic waveguide via gold nanoshells immerged in a silica base is proposed and simulated by using the finite difference time-domain (FDTD) method. For waveguides based on near-field coupling, transmission frequencies can be tuned in a wide region from 660 to 900\,nm in wavelength by varying shell thicknesses. After exploring the steady distributions of electric fields in these waveguides, we find that their decay lengths are about 5.948--12.83\,dB/1000\,nm, which is superior to the decay length (8.947\,dB/1000\,nm) of a gold nanosphere plasmonic waveguide. These excellent tunability and transmittability are mainly due to the unique hollow structure. These gold nanoshell waveguides should be fabricated in laboratory.

Abstract: A tunable plasmonic waveguide via gold nanoshells immerged in a silica base is proposed and simulated by using the finite difference time-domain (FDTD) method. For waveguides based on near-field coupling, transmission frequencies can be tuned in a wide region from 660 to 900 nm in wavelength by varying shell thicknesses. After exploring the steady distributions of electric fields in these waveguides, we find that their decay lengths are about 5.948--12.83 dB/1000 nm, which is superior to the decay length (8.947 dB/1000 nm) of a gold nanosphere plasmonic waveguide. These excellent tunability and transmittability are mainly due to the unique hollow structure. These gold nanoshell waveguides should be fabricated in laboratory.

Key words: waveguide, surface plasmons, energy transfer

中图分类号:  (Metals and metallic alloys)

  • 78.66.Bz
42.79.Gn (Optical waveguides and couplers) 77.22.Ch (Permittivity (dielectric function)) 78.30.Er (Solid metals and alloys ?) 78.40.Kc (Metals, semimetals, and alloys)