Open AccessClarification of surface modes of a periodic nanopatch metasurface
Author(s) -
Xiaomeng Jia,
Patrick T. Bowen,
Zhiqin Huang,
Xiaojun Liu,
Chris Bingham,
David R. Smith
Publication year - 2018
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.26.003004
Subject(s) - optics , surface plasmon , wavelength , resonance (particle physics) , spectral line , angle of incidence (optics) , plasmon , excitation , reflection (computer programming) , materials science , surface plasmon resonance , lattice (music) , total internal reflection , absorption (acoustics) , physics , atomic physics , astronomy , quantum mechanics , computer science , nanoparticle , acoustics , programming language , nanotechnology
We study the angle-dependent optical reflectance spectrum of a metasurface consisting of a periodic array of film-coupled plasmonic nanopatch particles. The nanopatch metasurface exhibits a strong, angle-independent absorption resonance at a wavelength defined by the nanopatch geometry and relative density. When the nanopatches are arranged in a regular lattice, a second, sharp absorption dip is present that varies strongly as a function of the incidence angle. This second resonance is a collective effect involving the excitation of surface plasmon modes and relates to a Wood's anomaly. Using an analytical model, we compute the surface modes of the structure and confirm details about the various mechanisms that contribute to the reflection spectra. The measured reflectance spectra are in excellent agreement with both analytical calculations and full-wave numerical simulations.