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Theoretical Analysis of Tunable Multimode Coupling in a Grating-Assisted Double-Layer Graphene Plasmonic System
journal contribution
posted on 2019-11-11, 16:07 authored by Ye Ming Qing, Hui Feng Ma, Tie Jun CuiA double-layer
graphene hybrid system is proposed to investigate the multimode coupling
at far-infrared frequencies. With the assistance of metallic grating,
the upper- and lower-layer graphene surface plasmons as well as the
magnetic polaritons can be excited simultaneously, resulting in selective
localization of electromagnetic energy. By tuning the thickness of
the spacer, the mutual conversion between strong coupling and weak
coupling can be achieved, giving rise to hybrid modes and Rabi splitting.
The dynamic control of multimode coupling is also investigated via
varying the Fermi energy of graphene. The hybrid coupling behaviors
exhibit unique energy-transfer and multiband light trapping as well
as mode splitting characteristics, which can be well described by
the classical coupled oscillator model. Our work may inspire related
studies on graphene-based light–matter interaction, and the
proposed hybrid system provides a good paradigm for designing many
plasmonic devices, including tunable optical switches, thermal emitters,
multiband absorbers, sensors, etc.
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double-layer graphenemode splitting characteristicsmultiband lightTheoretical Analysisfar-infrared frequencieslower-layer graphene surface plasmonsbehaviors exhibitelectromagnetic energyRabi splittingGrating-Assisted Double-Layer Graphene Plasmonic Systemoscillator modelplasmonic devicesmultimodeFermi energymultiband absorbersTunable Multimode
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