Abstract
In this article, the lineshape of Fano-like resonance of graphene plasmonic oligomers is investigated as a function of the parameters of the nanostructures, such as disk size, chemical potential and electron momentum relaxation time in mid-infrared frequencies. Also, the mechanism of the optimization is discussed. Furthermore, the environmental index sensing effect of the proposed structure is revealed, and a figure of merit of 25.58 is achieved with the optimized graphene oligomer. The proposed nanostructure could find applications in the fields of chemical or biochemical sensing.
Highlights
Plasmonic molecules (PMs), one kind of artificial molecules, are combinations of plasmonic oligomers in nanoscale that can support surface plasmons at specific resonant frequencies, anagously to the process of atoms coupling in chemical molecules to constitute bonds in chemistry [1,2,3].The sustaining strong charge oscillations result in the enhancement of electromagnetic (EM) fields due to the interaction between the particles
PMs consisting of noble metal materials, the higher index sensing effect of the extinction by separate resonances given byparameters, several subgroup of Fano-like hexamer is spectra optimized as a function of various such modes
Theinteraction interactionbehavior behavior of surface plasmon polaritons (SPPs) is sensitive to nanoparticle and parameters of the nanostructure influence the lineshape of extinction spectra of plasmonic oligomers
Summary
Plasmonic molecules (PMs), one kind of artificial molecules, are combinations of plasmonic oligomers in nanoscale that can support surface plasmons at specific resonant frequencies, anagously to the process of atoms coupling in chemical molecules to constitute bonds in chemistry [1,2,3]. Fano resonance is resonance possesses potential application in sensing [22] Variouseigenmodes configurations, such as heptamers that the destructive interference between two neighboring of the subgroups gives rise modulated by geometrical arrangement of plasmonic oligomers and nanoparticle parameters such [11,19,23]. DescriptionIn of dominant peaks in extinction spectra by separate resonances given by several this article, the modulation of based on graphene hexamer in mid-infrared a novel material, graphene can support Fano resonances, and possesses prominent frequency subgroup modes.has. PMs consisting of noble metal materials, the higher index sensing effect of the extinction by separate resonances given byparameters, several subgroup of Fano-like hexamer is spectra optimized as a function of various such modes.
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