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Theoretical research on a broadband terahertz absorber for thermally controlled radiation emission based on the epsilon-near-zero mode.

Authors :
Liu, Fei
Xu, Haochong
Pan, Honggang
Lai, Zhanyun
Zhang, Yuanyuan
Zhang, Ailing
Source :
Dalton Transactions: An International Journal of Inorganic Chemistry. 12/7/2024, Vol. 53 Issue 45, p18313-18320. 8p.
Publication Year :
2024

Abstract

In this paper, a tunable and ultra-broadband terahertz (THz) absorber is proposed. The absorber, which is built upon the conventional metal–dielectric–metal tri-layer configuration, incorporates a KCl thin film within the dielectric gap situated between the top resonator and the middle dielectric layer. The simulation indicates that the absorber effectively captures more than 90% of terahertz waves between 3.6 and 7.3 THz, achieving absorption of over 99% within the 5.8–6.9 THz range. This unique broadband absorber is enabled by the interaction of plasmon and epsilon-near-zero (ENZ) modes. Additionally, due to the utilization of VO2 in the top resonator, the designed absorber holds potential to function as a thermally controlled radiation emitter, exhibiting a high emissivity of 90.5% at high temperatures while maintaining a low emissivity of 8.2% at low temperatures. The absorber is uncomplicated and adjustable, offering great potential for use in thermal management, terahertz camouflage, and engineering insulation. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14779226
Volume :
53
Issue :
45
Database :
Academic Search Index
Journal :
Dalton Transactions: An International Journal of Inorganic Chemistry
Publication Type :
Academic Journal
Accession number :
180974817
Full Text :
https://doi.org/10.1039/d4dt02032d