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Journal of Applied Physics / Volume 108 / Issue 3 / ARTICLES / Nanoscale Science and Design

J. Appl. Phys. 108, 034313 (2010); http://dx.doi.org/10.1063/1.3463415 (9 pages)

Linear plasmon ruler with tunable measurement range and sensitivity

Shao-Ding Liu1 and Mu-Tian Cheng2

1Department of Physics, Wuhan University, Wuhan 430072, China and Department of SIE, SAE Magnetics (HK) Ltd., Dongguan 523087, China
2School of Electrical Engineering and Information, Anhui University of Technology, Maanshan 243002, China

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(Received 31 May 2010; accepted 15 June 2010; published online 6 August 2010)

The multiple localized surface plasmon resonances of nanorod dimers are theoretically investigated. The dark plasmon resonance of nanorod dimer aligned side-by-side is highly distance dependent. Based on this property, nanospheres are used to modify surface plasmon coupling between the two nanorods. The resonant wavelength shift increases approximately linearly with the increasing of nanospheres interparticle separations. This property makes such structure useful as plasmon ruler with homogeneous measurement sensitivity. The measurement range is increased to more than 100 nm, the resonant frequency is extended to the near-infrared region, and one can modify the structure size and nanorod aspect ratio freely to get the desired measurement range and sensitivity.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. PLASMON HYBRIDIZATION SCHEME
  3. MULTIPLE LSPR MODES OF NR DIMERS
    1. NR dimer aligned end-to-end
    2. NR dimer aligned side-by-side
  4. LINEAR PLASMON RULER
    1. Structure with small physical size
    2. Structure with large physical size
    3. Structure simplification
    4. Near field distribution
  5. CONCLUSION

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KEYWORDS and PACS

Keywords

gold, nanostructured materials, surface plasmon resonance

PACS

  • 73.20.Mf

    Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3463415

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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