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Mode Engineering in Large Arrays of Coupled Plasmonic–Dielectric Nanoantennas
Author(s) -
Nasir Mazhar E.,
Krasavin Alexey V.,
CórdovaCastro R. Margoth,
McPolin Cillian P. T.,
Bouillard JeanSebastien G.,
Wang Pan,
Zayats Anatoly V.
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202001467
Subject(s) - plasmon , metamaterial , materials science , optoelectronics , dielectric , fabrication , photonics , nanoscopic scale , nanotechnology , medicine , alternative medicine , pathology
Abstract Strong electromagnetic field confinement and enhancement can be readily achieved in plasmonic nanoantennas, however, this is considerably more difficult to realize over large areas, which is essential for many applications. Here, dispersion engineering in plasmonic metamaterials is applied to successfully develop and demonstrate a coupled array of plasmonic–dielectric nanoantennas offering an ultrahigh density of electromagnetic hot spots (10 11 cm −2 ) over macroscopic, centimeter scale areas. The hetero‐metamaterial is formed by a highly ordered array of vertically standing plasmonic dipolar antennas with a ZnO gap and fabricated using a scalable electrodeposition technique. It supports a complex modal structure, including guided, surface and gap modes, which offers rich opportunities, frequently beyond the local effective medium theory, with optical properties that can be easily controlled and defined at the fabrication stage. This metamaterial platform can be used in a wide variety of applications, including hot‐electron generation, nanoscale light sources, sensors, as well as nonlinear and memristive devices.