Open AccessExperimental investigation of extraordinary optical behaviors in a freestanding plasmonic cascade grating at visible frequency
Author(s) -
Yuzhang Liang,
Ningjuan Ruan,
Si Zhang,
Zhiyong Yu,
Ting Xu
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.26.003271
Subject(s) - plasmon , optics , materials science , grating , visible spectrum , cascade , fano resonance , dielectric , extraordinary optical transmission , optoelectronics , electric field , antisymmetric relation , surface plasmon , physics , surface plasmon polariton , chemistry , chromatography , quantum mechanics , mathematical physics
In this paper, we fabricate a freestanding plasmonic cascade grating and investigate the extraordinary optical behaviors associated with it. The structure consists of two identical metallic gratings with nearly perfect alignment on the lateral direction supported by a Si 3 N 4 membrane. Two types of optical transmission resonances emerge in the fabricated sample at visible frequencies, corresponding to the electric and magnetic resonances in the cascaded structure. These resonances respectively originate from the near-field coupling of plasmonic symmetric and antisymmetric modes in the metal-dielectric-metal waveguide. Moreover, the influence of the incident angle and structure parameters on two resonant peaks are investigated. We envision that this type of plasmonic free-standing cascaded nanostructure holds promise for a series of spectrum-dependent applications for the visible light.