Modeling of enhanced field confinement and scattering by optical wire antennas

Year: 2009

Authors: Locatelli A., De Angelis C., Modotto D., Boscolo S., Sacchetto F., Midrio M., Capobianco A. D., Pigozzo F. M., Someda C. G.

Autors Affiliation: Dipartimento di Elettronica per l’Automazione, Universita’ degli Studi di Brescia, via Branze 38, Brescia 25123, Italy;
Dipartimento di Ingegneria Elettrica, Gestionale e Meccanica, Universita’ degli Studi di Udine, via delle Scienze 208, Udine 33100, Italy; Dipartimento di Ingegneria dell’Informazione, Universita’ degli Studi di Padova, via Gradenigo 6/b, Padova 35131, Italy

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. (C) 2009 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 17 (19)      Pages from: 16792  to: 16800

More Information: The authors acknowledge financial support from Ministero dell\’Istruzione; dell\’Universita e della Ricerca in the framework of the PRIN 2007 programme, and from University of Padova, project CPDA081514/08.
KeyWords: antennas; plasmonic nanoantennas; dipole antennas; emission; nanocircuit
DOI: 10.1364/OE.17.016792

Citations: 34
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