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  Physics Express 2012, 2: 10
  Research Article
Surface plasmons coupling for local field enhancement in nanoring arrays on a metallic film
  J. N. He, G. W. Cai, P. Ding, C. Z. Fan, E. J. Liang  
School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China
  The plasmonic properties of a structure consisting of a two-dimensional periodic gold nanoring array and a gold film with a SiO2 spacer are investigated using the discrete dipole approximation (DDA) method. It is shown that the interaction of the nanoring array with its image charges can give rise to stronger localized surface plasmon resonance (LSPR), resulting in near perfect absorption and larger field enhancement with respect to the nanoring array alone; the interaction between the LSPR and surface plasmon polaritons (SPPs) gives rise to double-band resonances and even larger local field enhancement due to the strong coupling between the LSPR and SPP. The proposed structure may be attractive for surface-enhanced Raman scattering (SERS), sensing, emitter as well as solar cell applications.
  Surface plasmons coupling; Field enhancement; SERS  

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