Comparative study of field enhancement between isolated and coupled metal nanoparticles: An analytical approach

摘要

We present an analytical model that takes into account the coupling between the surface plasmonnmodes in complex metal nanostructures. We apply this model to evaluate the field enhancement innthe gap of two coupled Au metal spheres embedded in GaN dielectric and compare the result withnthat obtained by the single sphere. The results show additional improvement can be obtained in thengap depending on the width of the gap. This approach offers a clear physical insight for thenenhancement and a straightforward method for optimization. © 2010 American Institute of Physics.nu0004doi:10.1063/1.3532101