Abstract

The behavior of electromagnetic fields near the edge of a plasmonic wedge is investigated. We study the scattering properties, field divergence, and field enhancement near an Au wedge bounded by ${\mathrm{SiO}}_2$ upon illumination by TM-polarized light using hypersingular integral equations, as a function of wavelength, wedge angle, and angle of incidence. The transverse scattered field components show a convergent behavior at wavelengths approaching the surface plasmon energy asymptote (on the corresponding flat $\mathrm{Au}\text{-}{\mathrm{SiO}}_2$ interface), and become strongly divergent at longer wavelengths. The computed divergence is compared with Meixner’s theory and is found to be in good agreement over a restricted range of parameters.

©2012 Optical Society of America

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