We design an actively tunable polarization-sensitive multiband absorber in the mid-infrared region, which consists of stacked graphene multilayers separated by dielectric layers on a metal mirror. Benefiting from the anisotropic structure, the absorber has dual absorption bands with almost perfect absorption at different wavelengths under the x and y polarizations. Analyzing the electric field amplitude distributions and the surface currents, we find that the absorption peaks under the same polarization are excited in the graphene layers independently. Therefore, more absorption bands can be achieved by increasing the graphene layers. Adjusting the Fermi energy of the graphene layers, the working wavelengths of the polarization-sensitive multiband absorbers can be tuned actively, and thus achieving a wide band regulation range. Besides, the peak number and the peak strength of the multiband absorber can be actively controlled by the polarization angle as well. We also propose a method to design an actively tunable polarization-sensitive multiband absorber, which may have potential applications in mid-infrared devices, such as polarization-sensitive filters and detectors.
Received: 03 July 2020
Revised: 12 August 2020
Accepted manuscript online: 09 September 2020
Fund: the National Natural Science Foundation of China (Grant Nos. 11804178 and 11274188) and the Natural Science Foundation of Shandong Province, China (Grant No. ZR2018BA027).
Ai-Li Cao(曹爱利), Kun Zhang(张昆), Jia-Rui Zhang(张佳瑞), Yan Liu(刘燕), and Wei-Jin Kong(孔伟金) Actively tunable polarization-sensitive multiband absorber based on graphene 2020 Chin. Phys. B 29 114205
Fig. 1.
(a) Schematic diagram of graphene-based absorber. Top view of (b) top and (c) bottom graphene patches.
Fig. 2.
Absorption spectra under (a) x- and (b) y-polarized incident light with black solid line, red dashed line, and blue dashed line denoting structures including dual-layer graphene patches, top graphene patch, and bottom graphene patch, respectively.
Fig. 3.
Absorption spectra for different values of EF under (a) x polarization and (b) y polarization, respectively, relationship between the maximum absorption intensity and EF under (c) x polarization and (d) y polarization, and [(e) and (f)] absorption spectra for changing EF of each graphene layer individually under x and y polarizations.
Fig. 4.
(a) Absorption spectra under different polarization angles, and (b) maximum absorptions of peaks related to different polarization angles.
Fig. 5.
Electric field amplitude and surface current distribution under x polarization, relating to [(a) and (c)] P1 and [(b) and (d)] P2. Panels (a) and (b) show electric field around the top and bottom graphene patches in x–y plane, while panels (c) and (d) display those in x–z plane, respectively. Black dashed lines indicate the place of graphene structures.
Fig. 6.
Electric field amplitude and surface current distributions under y polarization at [(a) and (c)] P3, [(b) and (d)] P4. Panels (a) and (b) show electric field around the top and bottom graphene patches in x–y plane, while panels (c) and (d) display those in y–z plane, respectively.
Fig. 7.
(a) Absorption spectra for different values of d1, (b) related electric field distributions under x polarization, (c) absorption spectra for different values of d1, and (d) related electric field distributions under y polarization.
Fig. 8.
Variations of absorption spectrum with (a) l1, (b) w1, (c) D1, (d) l2, (e) w2, and (f) D2, respectively.
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