title: Modeling of enhanced field confinement and scattering by optical wire antennas.
abstract: We describe the application of full-wave and semi-analytical numerical tools for the modeling of optical wire antennas, with the aim of providing novel guidelines for analysis and design. The concept of antenna impedance at optical frequencies is reviewed by means of finite-element simulations, whereas a surface-impedance integral equation is derived in order to perform an accurate and efficient calculation of the current distribution, and thereby to determine the equivalent-circuit parameters. These are introduced into simple circuits models, directly borrowed from radio frequency, which are applied in order to model the phenomena of enhanced field confinement at the feed gap and light scattering by optical antennas illuminated by plane waves.
authors.affiliation: Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Dipartimento di Elettronica per l'Automazione, Università degli Studi di Brescia, via Branze 38, Brescia 25123, Italy. andrea.locatelli@ing.unibs.it
authors.forename: Andrea
authors.initials: A
authors.lastname: Locatelli
authors.forename: Costantino
authors.initials: C
authors.lastname: De Angelis
authors.forename: Daniele
authors.initials: D
authors.lastname: Modotto
authors.forename: Stefano
authors.initials: S
authors.lastname: Boscolo
authors.forename: Francesco
authors.initials: F
authors.lastname: Sacchetto
authors.forename: Michele
authors.initials: M
authors.lastname: Midrio
authors.forename: Antonio-D
authors.initials: AD
authors.lastname: Capobianco
authors.forename: Filippo M
authors.initials: FM
authors.lastname: Pigozzo
authors.forename: Carlo G
authors.initials: CG
authors.lastname: Someda