Design of a size-efficient tunable metamaterial absorber based on leaf-shaped cell at near-infrared regions

• Published in: Results in physics Vol. 9; pp. 1310 - 1316
• Main Authors: Huang, Hailong, Xia, Hui, Xie, Wenke, Guo, Zhibo, Li, Hongjian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2018; Elsevier
• Subjects: Dual-band high absorption; Graphene-based; Metamaterial; Size-efficient; Dual-band high absorption; Size-efficient; Metamaterial; Graphene-based
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2018.04.048

•The tunable peak wavelength is realized by manipulating graphene’s Fermi energy.•The single-band is changed into dual-band via variation of geometric parameter.•This method requires no additional elements or complex manufacturing process. A size-efficient tunable metamaterial absorber (MA) composed of metallic leaf-shaped cell, graphene layer, silicon substrate, and bottom metal film is investigated theoretically and numerically at near-infrared (NIR) regions. Simulation results reveal that the single-band high absorption of 91.9% is obtained at 1268.7 nm. Further results show that the single-band can be simply changed into dual-band high absorption by varying the geometric parameters of top metallic layer at same wavelength regions, yielding two high absorption coefficients of 96.6% and 95.3% at the wavelengths of 1158.7 nm and 1323.6 nm, respectively. And the effect of related geometric parameter on dual-band absorption intensities is also investigated to obtain the optimized one. The peak wavelength can be tuned via modifying the Fermi energy of the graphene layer through controlling the external gate voltage. The work shows that the proposed strategy can be applied to other design of the dual-band structure at infrared regions.