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Independently tunable dual-band perfect absorber based on graphene at mid-infrared frequencies

2015; Nature Portfolio; Volume: 5; Issue: 1 Linguagem: Inglês

10.1038/srep18463

2045-2322

Yuping Zhang, Tongtong Li, Qi Chen, Huiyun Zhang, John F. O’Hara, Ethan Abele, Antoinette J. Taylor, Hou‐Tong Chen, Abul K. Azad,

Plasmonic and Surface Plasmon Research

Abstract We design a dual-band absorber formed by combining two cross-shaped metallic resonators of different sizes within a super-unit-cell arranged in mirror symmetry. Simulations indicate that absorption efficiencies greater than 99% can be achieved at two different frequencies under normal incidence. We employ a design scheme with graphene integration, which allows independent tuning of individual absorption frequencies by electrostatically changing the Fermi energy of the graphene layer. High absorbance is maintained over a wide incident angle range up to 50 degrees for both TE and TM polarizations. It thus enables a promising way to design electrically tunable absorbers, which may contribute toward the realization of frequency selective detectors for sensing applications.