title: Surface electromagnetic field radiated by a subwavelength hole in a metal film.
abstract: We present an analytical expression for the electromagnetic field at the surface radiated by a hole in a metal film. This expression is valid for any metal, from the optical range to longer wavelengths, and for distances to the hole larger than a few tens of nanometers. The field pattern presents a rich behavior, showing three regions (a complex short distance, an intermediate range dominated by surface plasmon polaritons, and a long-distance one dominated by Norton waves). The crossover distances between these regimes depend strongly on both the wavelength and the angle with respect to the incident field.
authors.affiliation: Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, E-50009, Zaragoza, Spain. alexeynik@rambler.ru
authors.forename: A Yu
authors.initials: AY
authors.lastname: Nikitin
authors.forename: F J
authors.initials: FJ
authors.lastname: García-Vidal
authors.forename: L
authors.initials: L
authors.lastname: Martín-Moreno