期刊
NANOMATERIALS
卷 8, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/nano8080562
关键词
terahertz; graphene; broadband absorber; surface plasmons; metasurface
类别
资金
- National Natural Science Foundation of China [61601393, 11604276, 11501481]
- Shenzhen Science and Technology Innovation Committee [201887656, JCYJ20170306141755150]
- Natural Science Foundation of Fujian Province of China [2016J01321]
- Natural Science Foundation of Guangdong Province of China [2015A030310009, 2016A030310372]
We numerically demonstrate a broadband terahertz (THz) absorber that is based on a hybrid-patterned graphene metasurface with excellent properties of polarization insensitivity, wide-angle, and active tunability. Our design is made up of a single-layer graphene with periodically arranged hybrid square/disk/loop patterns on a multilayer structure. We find that broadband absorption with 90% terahertz absorbance and the fractional bandwidth of 84.5% from 1.38 THz to 3.4 THz can be achieved. Because of the axisymmetric configuration, the absorber demonstrates absolute polarization independence for both transverse electric (TE) and transverse magnetic (TM) polarized terahertz waves under normal incidence. We also show that a bandwidth of 60% absorbance still remains 2.7 THz, ranging from 1.3 THz to 4 THz, for a wide incident angle ranging from 0 degrees to 60 degrees. Finally, we find that by changing the graphene Fermi energy from 0.7 eV to 0 eV, the absorbance of the absorbers can be easily tuned from more than 90% to lower than 20%. The proposed absorber may have promising applications in terahertz sensing, detecting, imaging, and cloaking.
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