title: Terahertz Dipole Nanoantenna Arrays: Resonance Characteristics.
abstract: Resonant dipole nanoantennas promise to considerably improve the capabilities of terahertz spectroscopy, offering the possibility of increasing its sensitivity through local field enhancement, while in principle allowing unprecedented spatial resolutions, well below the diffraction limit. Here, we investigate the resonance properties of ordered arrays of terahertz dipole nanoantennas, both experimentally and through numerical simulations. We demonstrate the tunability of this type of structures, in a range (∼1-2 THz) that is particularly interesting and accessible by means of standard zinc telluride sources. We additionally study the near-field resonance properties of the arrays, finding that the resonance shift observed between near-field and far-field spectra is predominantly ascribable to ohmic damping.
authors.affiliation: Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Razzari
authors.forename: Andrea
authors.initials: A
authors.lastname: Toma
authors.forename: Matteo
authors.initials: M
authors.lastname: Clerici
authors.forename: Mostafa
authors.initials: M
authors.lastname: Shalaby
authors.forename: Gobind
authors.initials: G
authors.lastname: Das
authors.forename: Carlo
authors.initials: C
authors.lastname: Liberale
authors.forename: Manohar
authors.initials: M
authors.lastname: Chirumamilla
authors.forename: Remo Proietti
authors.initials: RP
authors.lastname: Zaccaria
authors.forename: Francesco
authors.initials: F
authors.lastname: De Angelis
authors.forename: Marco
authors.initials: M
authors.lastname: Peccianti
authors.forename: Roberto
authors.initials: R
authors.lastname: Morandotti
authors.forename: Enzo
authors.initials: E
authors.lastname: Di Fabrizio
keywords: Nanophotonics; Nanostructure fabrication; Plasmonics; Terahertz spectroscopy