Ultrahigh-Q Tunable Terahertz Absorber Based on Bulk Dirac Semimetal with Surface Lattice Resonance

In this paper, we present an easy-to-implement metamaterial absorber based on bulk Dirac semimetal (BDS). The proposed device not only obtains an ultrahigh quality factor (Q-factor) of 4133 and dynamic adjustability at high absorption, but also exhibits an excellent sensing performance with a figure...

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Bibliographic Details
Published in:Photonics 2022-01, Vol.9 (1), p.22
Main Authors: Wang, Zhiyong, Ou, Yanghong, Wang, Shiyu, Meng, Yanzi, Wang, Zi, Zhai, Xiang, Wang, Lingling, Xia, Shengxuan
Format: Article
Language:English
Subjects:
Absorbers
Absorbers (materials)
Boundary conditions
bulk Dirac semimetal
Chemical vapor deposition
Electric fields
Energy
Figure of merit
Gold
Graphene
Metamaterials
narrowband absorption
Q factors
refractive index sensing
Resonance
Sensors
Spectrum analysis
Unit cell
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Summary:In this paper, we present an easy-to-implement metamaterial absorber based on bulk Dirac semimetal (BDS). The proposed device not only obtains an ultrahigh quality factor (Q-factor) of 4133 and dynamic adjustability at high absorption, but also exhibits an excellent sensing performance with a figure of merit (FOM) of 4125. These outstanding properties are explained by the surface lattice resonance, which allows us to improve the quality factor significantly and control resonance wavelength precisely by tuning the unit cell periods, Fermi energy of the BDS, and structural parameters. Our findings can provide high-performance applications in terahertz filtering, detection, and biochemical sensing.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics9010022