title: Electromagnetic fields near plasmonic wedges.
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 SiO2 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 Au-SiO2 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.
authors.affiliation: Department of Electrical and Computer Engineering, K N Toosi University of Technology, Tehran, Iran.
authors.forename: Majid Rasouli
authors.initials: MR
authors.lastname: Disfani
authors.forename: Mohammad Sadegh
authors.initials: MS
authors.lastname: Abrishamian
authors.forename: Pierre
authors.initials: P
authors.lastname: Berini