Graphene Multiple Fano Resonances Based on Asymmetric Hybrid Metamaterial

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.

Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity

“…This mechanism is capable of achieving the ultra-narrow (high-Q) FRs due to the non-radiative nature of the dielectric waveguide modes [29]. More recently, the coupling between the plasmon modes, supported by the metallic nanostructure, and the multipolar (high-order) dark plasmonic modes, supported by the nanostructured graphene in the graphene-metal metamaterial, can also generate multiple FRs (the third mechanism) [30,31]. In the graphene-metal complex nanostructures, the exceptional electrical and optical properties (ultrahigh electron mobility and tunable conductivity) of graphene can enable the active tunability of FRs by external voltage in the terahertz and mid-infrared spectral range [32][33][34].…”

Ultranarrow and Tunable Fano Resonance in Ag Nanoshells and a Simple Ag Nanomatryushka

“…Up to now, various plasmonic structures have been proposed and demonstrated to generate FR in a wide spectral range from THz to the optical region [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ], such as dolmen structures [ 21 , 22 , 23 ], nanoparticles assemblies [ 24 , 25 , 26 , 27 , 28 ], concentric [ 29 , 30 , 31 , 32 , 33 , 34 ] and nonconcentric ring/disk cavities [ 35 , 36 ], and metallic nanoparticle/graphere hybrid sturctures [ 37 , 38 ]. In addition, the introduction of asymmetry into metallic nanostructures enables the generation of new dark (narrow) plasmon modes, and has been demonstated to be an effective strategy to engineering the line-shape, the linewidth, and the numbers of FR (single, double, triple and so on) [ 35 , 39 , 40 , 41 ]. Espectially, the excitation of multiple FRs can largely promote the accuracy and performance of plasmon ruler and nano-sensor [ 8 , 28 ].…”

“…Unlike the metallic nanoparticle assemblies and asymmetry nanostructures, to generate FR with high complexity and high precisely (inter-particle separation on the order of several tens of nanometers) [ 24 , 25 , 26 , 27 , 28 , 35 , 36 , 39 , 40 , 41 ], a nobel metal (Au/Ag) nanoshell composed of a spherical dielectric core and a metallic shell is the simplest plasmonic nanostructure [ 52 ]. More recently, these have been demonstrated both theoretically and experimentally to be capable of supporting multiple sharp FRs induced by the multipolar high- Q cavity plasmon modes when the dielectric core size can be comparable to the wavelength of light (beyond the electrostatic limit) [ 53 , 54 , 55 , 56 ].…”

Theoretical Study on Metasurfaces for Transverse Magneto-Optical Kerr Effect Enhancement of Ultra-Thin Magnetic Dielectric Films

“…Recently, obtaining the enhancement of magnetic fields in the visible frequency has become as important in nanophotonics as obtaining the enhancement of electric fields, stemming from many applications, for example, magnetic sensors or magnetic nonlinearity [1][2][3][4][5][6][7][8][9]. In the interactions between light and matter, the magnetic contribution of light can be neglected generally because it is too weak [10].…”