Fundamental Behavior of Electric Field Enhancements in the Gaps Between Closely Spaced Nanostructures

Details Fundamental Behavior of Electric Field Enhancements in the Gaps Between Closely Spaced Nanostructures Fundamental Behavior of Electric Field Enhancements in the Gaps Between Closely Spaced Nanostructures

2010-08-15

arxiv.org/abs/1008.2490v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages and 4 figures

Scientific paper

We demonstrate that the electric field enhancement that occurs in a gap between two closely spaced nanostructures, such as metallic nanoparticles, is the result of a transverse electromagnetic waveguide mode. We derive an explicit semianalytic equation for the enhancement as a function of gap size, which we show has a universal qualitative behavior in that it applies irrespective of the material or geometry of the nanostructures and even in the presence of surface plasmons. Examples of perfect electrically conducting and Ag thin-wire antennas and a dimer of Ag spheres are presented and discussed.

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