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Abstract
We design and numerically investigate a graphene-based asymmetric nanoantenna microstructure that can be used to realize electrically controllable, unidirectionally propagating broadband surface plasmon polaritons. The device geometry facilitates the simultaneous excitation of two localized surface plasmons resonances in the whole structure, and consequently, the asymmetric nanoantenna can be considered as being composed of two oscillating magnetic dipoles, wherein the interference of the radiated electromagnetic waves leads to a unidirectional propagation effect. Our results indicate that our proposed active device is promising for realizing compactable, tunable, terahertz plasmonic light sources.
Highlights
Surface plasmon polaritons (SPPs) are the electromagnetic waves traveling along metal–dielectric or metal–air interfaces that originate from the interaction between light and collective electron oscillations on metal surfaces
When compared with previously proposed devices, our designed structure can achieve the tuning unidirectional SPP propagation over a broadband wavelength range based on the interference of excited localized surface plasmons (LSPs)
Plasmon waves propagated upon application of a voltage V between the graphene sheet and the back-gated Au are investigated by means of the finite element method (FEM)
Summary
Surface plasmon polaritons (SPPs) are the electromagnetic waves traveling along metal–dielectric or metal–air interfaces that originate from the interaction between light and collective electron oscillations on metal surfaces. SPPs have attracted considerable attraction in terms of their application to subwavelength-optics microscopy, lithography beyond the diffraction limit, and miniaturized photonics devices for practical applications Owing to their characteristics of localized field enhancement and subwavelength confinement, SPPs have been widely applied in plasmonic metamaterial and metasurface applications [1,2,3,4]. Via tuning of the interband and intraband transitions, graphene can be utilized in designing for electro-optic modulators [21,22] In this regard, tunable graphene-based unidirectional devices have recently been proposed by Fang [23] and He [24]. When compared with previously proposed devices, our designed structure can achieve the tuning unidirectional SPP propagation over a broadband wavelength range based on the interference of excited localized surface plasmons (LSPs)
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