Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 16, Issue -, Pages 1115-1118Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2016.2623316
Keywords
Dynamic tuning; graphene stacks; terahertz (THz); ultrabroadband absorber; ultrathin
Funding
- National Natural Science Foundation of China [61372029]
- National Basic Research Program of China [613138]
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The concept of an ultrabroadband ultrathin terahertz (THz) absorber based on graphene stacks is presented. To realize dynamic tuning of the absorption band, we combine two concentric circular split-rings encircling a split circular resonator with graphene stacks embedded in a SiO2 dielectric. The transmission line model for the proposed absorber has been theoretically investigated via the effective-medium method. The simulated results showa 0.9 absorption coefficient over the range 2.58-3.56 THz, and the central frequency of the absorption band can be tuned without absorption reduction by changing the gate voltage on the graphene stack. Furthermore, the absorption performance exhibits insensitivity to the angle of incidence. Thus, the proposed absorber is very promising for various THz applications.
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