Open AccessBroadband long-wave infrared metamaterial absorber based on single-sized cut-wire resonators
Author(s) -
Zheng Qin,
Dejia Meng,
Yang Fu,
Xun Shi,
Zhongzhu Liang,
Haiyang Xu,
David R. Smith,
Yichun Liu
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.430068
Subject(s) - materials science , optics , metamaterial , extinction ratio , resonator , metamaterial absorber , optoelectronics , absorption (acoustics) , infrared , polarization (electrochemistry) , surface plasmon , wavelength , broadband , split ring resonator , plasmon , physics , tunable metamaterials , chemistry
Broadband absorption is critical for the applications of metamaterial absorbers. In this work, a broadband long-wave infrared (LWIR) absorber with classical metal-dielectric-metal configuration is numerically demonstrated. The absorber consists of single-sized cut-wire arrays that show broadband and high extinction ratio, attributed to polarization-selective simultaneous excitation of propagated and localized surface plasmon resonances. The average absorption rate of the TM wave reaches 91.7% and 90% of the incident light is absorbed by the resonator in the wavelength range of 7.5-13.25µm so that the average extinction ratio in the resonator layer reaches 125. The polarization insensitive broadband absorption can be obtained by a cross resonator which can be treated as a pair of cut-wires perpendicular to each other. Our metamaterial absorber with single-sized resonators shows spatially concentrated broadband absorption and may have promising applications for hot-electron devices, infrared imaging, and thermal detection.