Abstract
We theoretically investigate multiple Fano resonances in an asymmetric hybrid graphene–metal metamaterial. The multiple Fano resonances emerge from the coupling of the plasmonic narrow bonding and antibonding modes supported by an in-plane graphene nanoribbon dimer with the broad magnetic resonance mode supported by a gold split-ring resonator. It is found that the Fano resonant mode with its corresponding dark mode of the antibonding mode in the in-plane graphene nanoribbon dimer is only achieved by structural symmetry breaking. The multiple Fano resonances can be tailored by tuning the structural parameters and Fermi levels. Active control of the multiple Fano resonances enables the proposed metamaterial to be widely applied in optoelectronic devices such as tunable sensors, switches, and filters.
Highlights
Optical Fano resonance (FR) is a typical destructive interference effect resulting from the strong coupling between spectrally overlapping narrow discrete and broad excitation modes, which shows a sharp and asymmetric line shape and produces a large electromagnetic field congregation [1,2]
Due to the net electric dipole moment of the antibonding mode being zero in the quasistatic limit, the antibonding mode of the graphene nanoribbon dimer (GNRD) is a real narrow dark mode, which could not be optically excited under normal incidence
We have theoretically studied the tunable multiple Fano resonances in a hybrid metamaterial with decreased structural symmetry composed of an in-plane graphene nanoribbon dimer and gold split-ring resonator
Summary
Optical Fano resonance (FR) is a typical destructive interference effect resulting from the strong coupling between spectrally overlapping narrow discrete and broad excitation modes, which shows a sharp and asymmetric line shape and produces a large electromagnetic field congregation [1,2]. Single FRs have been realized from visible to far-infrared in different kinds of metamaterials and metallic nanostructures, and many efforts have been devoted to figure out their highly efficient generations and tunabilities [3,4,5,6,7,8,9,10]. Multiple FRs can be realized by constructing the meta-molecules for near-field coupling between multiple bright and dark meta-atoms [21,22]. The structural symmetry breaking enables the generation of new narrow dark modes as well as multiple FRs, which has been reported in various nanostructures [2,4,11,23,24,25,26,27,28]
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