Open AccessModeling of enhanced field confinement and scattering by optical wire antennas
Author(s) -
Andrea Locatelli,
Costantino De Angelis,
D. Modotto,
Stefano Boscolo,
F. Sacchetto,
M. Midrio,
Antonio-Daniele Capobianco,
F.M. Pigozzo,
C.G. Someda
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.016792
Subject(s) - optics , scattering , light scattering , forward scatter , field (mathematics) , physics , materials science , mathematics , pure mathematics
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.