Giant enhancement of electric field between two close metallic grains due to plasmonic resonance

TL;DR

This paper theoretically investigates how plasmonic resonance between two closely spaced metallic grains can significantly enhance the electric field, with analytic solutions confirming the resonance conditions and potential extensions to complex geometries.

Contribution

It provides a theoretical framework and analytic solutions for electric field enhancement due to plasmonic resonance between metallic grains, extending understanding to more complex geometries.

Findings

Resonance conditions for plasmonic enhancement are established.

Electric field can be greatly amplified between close metallic grains.

Analytic solutions confirm the resonance effects for simple geometries.

Abstract

We theoretically examine plasmonic resonance between two close metallic grains separated by a gap of width much less than the length of the incident electromagnetic wave. Resonance conditions are established and the electric field enhancement is found. Our general arguments are confirmed by analytic solution of the problem for simplest geometries. We discuss an extension of our results to more complex cases.