Open AccessDual-band and polarization-independent infrared absorber based on two-dimensional black phosphorus metamaterials
Author(s) -
Jiao Wang,
Yannan Jiang,
Zhirun Hu
Publication year - 2017
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.25.022149
Subject(s) - metamaterial , materials science , band gap , optics , infrared , split ring resonator , metamaterial absorber , optoelectronics , polarization (electrochemistry) , extraordinary optical transmission , multi band device , resonator , refractive index , surface plasmon , plasmon , surface plasmon polariton , physics , tunable metamaterials , telecommunications , chemistry , computer science , antenna (radio)
Two-dimensional (2D) black phosphorus (BP) with direct band gap, bridges the characteristics of graphene with a zero or near-zero band gap and transition metal dichalcogenides with a wide band gap. In the infrared (IR) regime, 2D BP materials can attenuate electromagnetic energy due to losses derived from its surface conductivity. This paper proposes an IR absorber based on 2D BP metamaterials. It consists of multi-layer BP-based nano-ribbon pairs, each formed by two orthogonally stacked nano-ribbons. The multi-layer BP metamaterials and bottom gold mirror together form a Fabry-Perot resonator that could completely inhibit light transmission to create strong absorption through the BP metamaterials. Unlike previously reported BP metamaterial absorbers, this new structure can operate at two frequency bands with absorption > 90% in each owning to the first-order and second-order Fabry-Perot resonant frequencies. It is also polarization independent due to the fourfold rotational structural symmetry. To our best knowledge, this is the first report on using BP metamaterials in an absorber that operates independent of polarization and in dual bands.