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.
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1 August 2010
Research Article|
August 06 2010
Linear plasmon ruler with tunable measurement range and sensitivity
Shao-Ding Liu;
Shao-Ding Liu
a)
1Department of Physics,
Wuhan University
, Wuhan 430072, China
and Department of SIE, SAE Magnetics (HK) Ltd.
, Dongguan 523087, China
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Mu-Tian Cheng
Mu-Tian Cheng
2School of Electrical Engineering and Information,
Anhui University of Technology
, Maanshan 243002, China
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a)
Electronic mail: [email protected].
J. Appl. Phys. 108, 034313 (2010)
Article history
Received:
May 31 2010
Accepted:
June 15 2010
Citation
Shao-Ding Liu, Mu-Tian Cheng; Linear plasmon ruler with tunable measurement range and sensitivity. J. Appl. Phys. 1 August 2010; 108 (3): 034313. https://doi.org/10.1063/1.3463415
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