Abnormal Fano Profile in Graphene-Wrapped Dielectric Particle Dimer

We give a theoretical study on the near field enhancement and far field spectrum of an adjacent graphene-wrapped sphere dimer with different radii. The Fano profile is found in the near field enhancement spectrum of such a symmetry-broken dimer system, which is, however, hidden in the far field spec...

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Bibliographic Details
Published inPhotonics Vol. 7; no. 4; p. 124
Main Authors Huang, Yang, Ma, Pujuan, Wu, Ya Min
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2020
Subjects
Approximation
Coupling
dimer
Dimers
Dipole moments
dipole–dipole limit
Energy levels
Fano resonance
Far fields
Graphene
Hybridization
Incident waves
Near fields
plasmons hybridization
Spectrum analysis
Spheres
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Summary:We give a theoretical study on the near field enhancement and far field spectrum of an adjacent graphene-wrapped sphere dimer with different radii. The Fano profile is found in the near field enhancement spectrum of such a symmetry-broken dimer system, which is, however, hidden in the far field spectrum. We demonstrate that this kind of Fano profile is rising from the coupling of dimer’s plasmon hybridization modes by analyzing the dipole moments of each sphere. Moreover, different orientation of incident wave polarization will lead to the different plasmon hybridization coupling, thus giving rise to a different Fano profile. By changing the Fermi energy level, we could achieve tunable Fano profile in near field enhancement.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics7040124