title: Analog computing using reflective plasmonic metasurfaces.
abstract: Motivated by the recent renewed interest in compact analog computing using light and metasurfaces ( Silva, A. et al. Science 2014 , 343, 160 - 163), we suggest a practical approach to its realization that involves reflective metasurfaces consisting of arrayed gold nanobricks atop a subwavelength-thin dielectric spacer and optically thick gold film, a configuration that supports gap-surface plasmon resonances. Using well-established numerical routines, we demonstrate that these metasurfaces enable independent control of the light phase and amplitude, and design differentiator and integrator metasurfaces featuring realistic system parameters. Proof-of-principle experiments are reported along with the successful realization of a high-quality poor-man's integrator metasurface operating at the wavelength of 800 nm.
authors.affiliation: Department of Technology and Innovation, University of Southern Denmark , Niels Bohrs Allé 1, DK-5230 Odense M, Denmark.
authors.forename: Anders
authors.initials: A
authors.lastname: Pors
authors.forename: Michael G
authors.initials: MG
authors.lastname: Nielsen
authors.forename: Sergey I
authors.initials: SI
authors.lastname: Bozhevolnyi
keywords: Metasurfaces; analog computing; gap surface plasmons; metamaterials; plasmonics