Enhancement and Confinement of The Electromagnetic Fileds Inside Hot Spots

EDUARDO A. CORONADO

JOURNAL OF PHYSICAL CHEMISTRY C

AMER CHEMICAL SOC

Lugar: Washington; Año: 2009 vol. 113 p. 6315 - 6315

1932-7447

A novel and easy approach to implement is developed to analyze the degree of convergence,confinement, and enhancement of calculated electromagnetic fields generated in plasmonic nanoparticles (NPs) of arbitrary shape. The approach is based on computing the variation of the volume trapped (VT) between a constant enhancement surface around a metal NP and the nanoparticle surface boundary as a function of the enhancement itself. This method is a new and more practically relevant approach to testing the convergence than measures traditionally employed. For the test cases outlined here, the converged VT vs enhancement curve could be fitted very accurately to a triple exponential expression which makes it convenient to determine the mean field enhancement within a trapped volume outside the NP, as well as the degreeof localization and spreading of the hot spots(HSs) in 3D space. The technique introduced here should aid the understanding and a rational design of plasmonic de