Abstract
The formation of Fano resonance based on graphene heptamers with D6h symmetry and the effect of nanoparticles at different positions on the collective behavior are investigated in this paper. The significances of central nanodisks on the whole structure are studied first by varying the chemical potential. In addition, the effect of six graphene nanodisks placed in the ring on collective behaviors is also investigated. The influence of the nanodisks at different positions of the ring on the Fano resonance spectrum of the whole oligomer is researched by changing the chemical potential and radius. The proposed nanostructures may find broad applications in the fields of chemical and biochemical sensing.
Highlights
Surface plasmon resonance (SPR), including localized surface plasmon resonance (LSPR) and propagating surface plasmon polariton (SPP) [1,2], is a special electromagnetic mode formed by the interaction between the collective oscillation of electrons moving freely on the material surface and the incident photons
Fano resonance can be obtained by two approaches [26]
One approach is to destroy the symmetry of the structure [33,34]
Summary
Surface plasmon resonance (SPR), including localized surface plasmon resonance (LSPR) and propagating surface plasmon polariton (SPP) [1,2], is a special electromagnetic mode formed by the interaction between the collective oscillation of electrons moving freely on the material surface and the incident photons. Fano resonance is caused by the destructive interference between a subradiant dark mode and a superradiant bright mode [11,12,13,14,15]. It effectively suppresses radiation attenuation, forms fine spectral lines, and enhances the near field [16]. Many metal-based nanostructures, such as metal strips [17,18,19], nanosphericals [2,20,21], nanorings [22,23], nanodisks [24,25], and nanospherical shells [16,21], have been designed to study the Fano effect
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