title: Response of plasmonic resonant nanorods: an analytical approach to optical antennas.
abstract: An analytical model of the response of a free-electron gas within the nanorod to the incident electromagnetic wave is developed to investigate the optical antenna problem. Examining longitudinal oscillations of the free-electron gas along the antenna nanorod a simple formula for antenna resonance wavelengths proving a linear scaling is derived. Then the nanorod polarizability and scattered fields are evaluated. Particularly, the near-field amplitudes are expressed in a closed analytical form and the shift between near-field and far-field intensity peaks is deduced.
authors.affiliation: Institute of Physical Engineering and CEITEC BUT, Brno University of Technology, Technická 2, 61669 Brno, Czech Republic. kalousek@fme.vutbr.cz
authors.forename: Radek
authors.initials: R
authors.lastname: Kalousek
authors.forename: Petr
authors.initials: P
authors.lastname: Dub
authors.forename: Lukáš
authors.initials: L
authors.lastname: Břínek
authors.forename: Tomáš
authors.initials: T
authors.lastname: Šikola