Open AccessCombined role of polarization matching and critical coupling in enhanced absorption of 2D materials based on metamaterials
Author(s) -
Shangkun Guo,
Jie Deng,
Jing Zhou,
Yu Yu,
Yonghao Bu,
Tianyun Zhu,
Xiansong Ren,
Zhifeng Li,
Wei Lü,
Xiaoshuang Chen
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.419028
Subject(s) - absorptance , materials science , optics , metamaterial , polarization (electrochemistry) , optoelectronics , infrared , plasmon , visible spectrum , ray , physics , reflectivity , chemistry
Since 2D materials are typically much more efficient to absorb in-plane polarized light than out-of-plane polarized light, keeping the light polarization in-plane at the 2D material is revealed to be a crucial factor other than critical coupling in light absorption enhancement in a 2D material integrated with a light coupling structure. When the composite of a metal-insulator-metal structure and a 2D material changes from the magnetic resonator form to the metasurface Salisbury screen one, the field polarization at the 2D material changes from a mainly out-of-plane status to a mainly in-plane status. As a result, for graphene, the absorptance enhancement is increased by 1.6 to 4.2 times, the bandwidth enlarged by 3.6 to 6.4 times, and the metal loss suppressed by 7.4 to 24 times in the mid- to far-infrared range, leading to the absorptance of graphene approaching 90% in the mid-infrared regime and 100% in the THz regime. For monolayer black phosphorus, the absorptance enhancement at the wavelength of 3.5 µm is increased by 5.4 times, and the bandwidth enlarged by 1.8 times. For monolayer MoS 2 , the averaged absorptance in the visible-near infrared range is enhanced by 4.4 times from 15.5% to 68.1%.