Open AccessOptical bistability in gap-plasmon metasurfaces in consideration of classical nonlocal effects
Author(s) -
Tingyin Ning,
Huawei Liang,
Yanyan Huo,
Lina Zhao
Publication year - 2020
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.396713
Subject(s) - optical bistability , optics , bistability , local field , materials science , electric field , nonlinear optics , grating , surface plasmon , quantum nonlocality , dielectric , refractive index , field (mathematics) , kerr effect , plasmon , physics , optoelectronics , nonlinear system , condensed matter physics , laser , quantum , mathematics , quantum mechanics , quantum entanglement , pure mathematics
Optical bistability of linear reflectance and third-harmonic generation is investigated in a metasurface consisting of metallic grating coupled with metallic film spaced with nonlinear dielectric material. Linear optical reflectance and electric field enhancement are achieved for gaps <20 nm in the presence of classical nonlocality in metallic nanostructures. Enlarged thresholds from the higher to lower reflectance states are observed from 140 kW/cm 2 for the local model to 300 kW/cm 2 for the nonlocal model for 0.5-nm gaps. Though the linear reflectance almost overlaps for local and nonlocal models for 20-nm gaps, the optical bistability hysteresis loops retain large differences because local field differences are amplified owing to the relation of nonlinear refraction with square of local field and historical evolution of the optical bistability.