Open AccessBroadband mirrors for surface plasmon polaritons using integrated high-contrast diffraction gratings
Author(s) -
Evgeni A. Bezus,
Leonid L. Doskolovich
Publication year - 2021
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.415259
Subject(s) - optics , surface plasmon polariton , surface plasmon , materials science , plasmon , diffraction , grating , diffraction grating , scattering , optoelectronics , dielectric , diffraction efficiency , total internal reflection , physics
We propose and numerically investigate integrated high-contrast gratings (HCGs) for surface plasmon polaritons (SPPs) propagating along metal-dielectric interfaces, which consist of periodically arranged silicon pillars located on the gold surface. We demonstrate that such on-chip HCGs can be used as broadband plasmonic mirrors, which have subwavelength footprint in the SPP propagation direction and mean reflectance exceeding 85% in a 200-nm-wide spectral range for both the cases of normal and oblique SPP incidence. In order to increase the HCG efficiency and design practically feasible structures, we utilize a parasitic scattering suppression technique based on the use of two-layer grating pillars. The presented results may find application in two-dimensional optical circuits for steering the SPP propagation.