Journal
OPTICS COMMUNICATIONS
Volume 283, Issue 14, Pages 2947-2952Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2010.03.033
Keywords
Nanoparticle; Dimer; Near field; Enhancement
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Funding
- National Science Foundation of China [60907025]
- Science Foundation of Southeast University [KJ2009358]
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The concentric core-shell nanoparticle dimers have hot spots with enhanced electric fields in their junctions, which can be used in the surface enhanced Raman spectra analysis. Here the non-concentric core-shell nanoparticle dimers are proposed by introducing a shift between the dielectric core and the metal shell By using the three dimensional finite difference time domain method, the plasmon resonances and the near field properties of the core-shell nanoparticle dimers affected by the non-concentric shift, dimer separation, excitation wavelength and polarization are analyzed in detail The results show that the local near fields of the non-concentric core-shell nanoparticle dimers can be much more enhanced than those of the concentric ones. Also the plasmon resonance wavelengths of the dimers can be effectively tuned by the non-concentric shifts between the core and shell. The proposed nanostructures can have great potential in various near field applications (C) 2010 Elsevier B V All rights reserved
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