Open AccessUltrathin multi-band coherent perfect absorber in graphene with high-contrast gratings
Author(s) -
Haiyu Meng,
Qi Lin,
Xiong-Xiong Xue,
JiChun Lian,
Guidong Liu,
Wei Xu,
Xiang Zhai,
Ziran Liu,
Jianghua Chen,
Hongjian Li,
Xiongjun Shang,
Lingling Wang
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.400014
Subject(s) - graphene , absorption (acoustics) , materials science , optics , resonator , optoelectronics , plasmon , resonance (particle physics) , physics , nanotechnology , particle physics
High-contrast gratings (HCGs) can be designed as a resonator with high-quality factor and surface-normal emission, which are excellent characters for designing optical devices. In this work, we combine HCGs with plasmonic graphene structure to achieve an ultrathin five-band coherent perfect absorber (CPA). The presented CPA can achieve multi- and narrow-band absorption with high intensity under a relatively large incident angle. The good agreement between theoretical analysis and numerical simulated results demonstrates that our proposed HCGs-based structure is feasible to realize CPA. Besides, by dynamically adjusting the Fermi energy of graphene, we realize the active tunability of resonance frequency and absorption intensity simultaneously. Benefitting from the combination of HCGs and the one-atom thickness of graphene, the proposed device possesses an extremely thin feature. Our work proposes a novel method to manipulate coherent perfect absorption and is helpful to design tunable multi-band and ultrathin absorbers.