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.
Received: 25 December 2007
Revised: 29 January 2008
Accepted manuscript online:
Fund: 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).
Cite this article:
Zhang Hai-Xi(张海汐), Gu Ying(古英), and Gong Qi-Huang(龚旗煌) A visible-near infrared tunable waveguide based on plasmonic gold nanoshell 2008 Chin. Phys. B 17 2567
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