One-way surface states due to nonreciprocal light-line crossing

Abbasi, Fereshteh; Davoyan, Artur R.; Engheta, Nader

doi:10.1088/1367-2630/17/6/063014

Cited by 14 publications

(18 citation statements)

References 42 publications

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“…An area-weighted homogenization of the photonic crystal yields an effective Voigt parameter of only ≈ 0.09, while a different homogenization scheme for magneto-optical media [34] yields ≈ 0.2 [37]. Thus, the Voigt parameter of the Dirac point-induced effective medium is substantially enhanced relative to the homogenized photonic crystal, in agreement with previous arguments that NZ index media can enhance magneto-optical activity [7,[16][17][18].…”

Section: Maxwell's Equations That the Bulk Dispersion Relation Issupporting

confidence: 86%

“…In conclusion, we have designed a realistic gyromagnetic photonic crystal with an unpaired Dirac point at Γ. The Dirac medium serves as a magneto-optical NZ index effective medium [7][8][9][10][11][12][16][17][18], and we have identified the "remnant" of the topological edge state with the magneto-plasmon-like surface states of the effective medium. The effective Voigt parameter is ≈ 0.94, which is very near the "Hall opacity" regime [16], and enhanced by approximately five-fold relative to the homogenized value.…”

Section: Maxwell's Equations That the Bulk Dispersion Relation Ismentioning

confidence: 95%

“…We indeed find strong magneto-optical activity in our effective medium, with a near-unity effective Voigt parameter. Another striking feature of magneto-optical NZ index media is that they can support surface magnetoplasmon-like [19] waves that move unidirectionally along a sample edge without being back-scattered by edge deformations and other imperfections [16][17][18]. The unidirectional and robust nature of these modes is strongly reminiscent of the photonic topological edge states [20] of 2D photonic crystals with topologically nontrivial bandstructures, whose existence is guaranteed by topological principles.…”

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confidence: 99%

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Realization of a magneto-optical near-zero index medium by an unpaired Dirac point

et al. 2018

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We realize an unpaired Dirac cone at the center of the first Brillouin zone, using a gyromagnetic photonic crystal with broken square sub-lattice symmetry and broken time reversal symmetry. The behavior of the Dirac modes can be described by a gyromagnetic effective medium model with nearzero refractive index, and Voigt parameter near unity. When two domains are subjected to opposite magnetic biases, there exist unidirectional edge states along the domain wall. This establishes a link between topological edge states and the surface waves of homogenous magneto-optical media.

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Section: Maxwell's Equations That the Bulk Dispersion Relation Issupporting

confidence: 86%

Section: Maxwell's Equations That the Bulk Dispersion Relation Ismentioning

confidence: 95%

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confidence: 99%

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Realization of a magneto-optical near-zero index medium by an unpaired Dirac point

et al. 2018

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“…For realizing any plasmonic devices, one should have the instrument for manipulating by plasmon-polaritons. This goal may be achieved, for example, by the combination of plasmonic and optically active materials [17][18][19][20][21][22]. Among other optically active materials, the use of magnetic ones leads to cross-coupling between magnetic properties of materials and optical fields: different mechanisms may lead to optically induced magnetic fields [23][24][25][26] and excitation of localized plasmons may lead to a major increase in magneto-optical effects [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Magneto‐Plasmonics and Optical Activity in Graphene‐Based Nanowires

Kuzmin¹,

Bychkov²,

Шавров³

et al. 2017

Nanoplasmonics - Fundamentals and Applications

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Nowadays, graphene plasmonics shows a great number of features unusual for traditional (metal-based) plasmonics from high localization and large propagation distance of surface plasmon-polaritons (SPPs) through the existence of both TE-and TM-polarized SPPs to the possibility of controlled SPPs by graphene chemical potential (or, equivalently, by gate voltage or chemical doping). Cylindrical graphene-based plasmonic structures have some advantages in contrast to planar geometry: absence of edge losses, existence of high-order azimuthal modes, etc. In this work, we discuss some ways to obtain an optical activity in cylindrical graphene-based plasmonic structures and its possible applications to SPPs manipulation.

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“…For realizing any plasmonic device one should possess a tool for SPP manipulation. A conventional approach in noble metal-based active plasmonics relies on combining plasmonic and optically active materials [18][19][20][21][22]. For example, the coupling between magnetic and optical properties in magneto-optical materials leads to the optically induced magnetic fields through the inverse Faraday effect [23][24][25][26] or enhanced magneto-optical effects due to plasmonic excitations [27][28][29][30][31][32][33][34].…”

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confidence: 99%

Plasmonics of magnetic and topological graphene-based nanostructures

et al. 2018

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Faraday effect, inverse magnetooptical effects. 2 ABSTRACT. Graphene is a unique material to study fundamental limits of plasmonics. Apart from the ultimate single-layer thickness, its carrier concentration can be tuned by chemical doping or applying an electric field. In this manner the electrodynamic properties of graphene can be varied from highly conductive to dielectric. Graphene supports strongly confined, propagating surface plasmon-polaritons (SPPs) in a broad spectral range from terahertz to midinfrared frequencies. It also possesses a strong magneto-optical response and thus provides complimentary architectures to conventional magneto-plasmonics based on magneto-optically active metals or dielectrics. Despite of a large number of review articles devoted to plasmonic properties and applications of graphene, little is known about graphene magneto-plasmonics and topological effects in graphene-based nanostructures, which represent the main subject of this review. We discuss several strategies to enhance plasmonic effects in topologically distinct closed surface landscapes, i.e. graphene nanotubes, cylindric nanocavities and toroidal nanostructures. A novel phenomenon of the strongly asymmetric SPP propagation on chiral meta-structures and fundamental relations between structural and plasmonic topological indices are reviewed. I. IntroductionGraphene opens up wide prospects for numerous flatland photonic and plasmonic applications [1-7]. Graphene-based waveguides support localized electromagnetic SPP waves, both TE-and TM-polarized [8-16]. Their tight confinement and long propagation length allow for observing strong light-matter interactions in graphene-based structures [17]. Optical properties of graphene transformations give rise to distinct topological indices, which largely determine the properties of plasmonic modes. The interplay of the intrinsic (elliptic versus hyperbolic) topology of SPPs propagating on a flat 2D-meta-surface and the geometrical 3D-topology of nanostructures can induce novel plasmonic effects: a giant azimuthal rotation of intensity distribution of particular SPP modes upon propagation, one-way propagation of SPPs, vanishing of the Fabry-Perot resonances in finite length meta-tubes, unidirectional circulating Mach-Zehnder-like resonances in a meta-torus, etc.Figure 1: (A) An array of densely packed graphene stripes with sub-wavelength periodicity Λ forms a metasurface which may support both elliptic (B) and hyperbolic SPPs (C). A rolled-up meta-surface forms a meta-tube and its donut-like shape is a meta-torus (D). In (B) and (C) Λ = 50 nm, A = 45 nm, B = 5 nm. 5The cylindrical geometry deserves a particular attention as it provides a common basis for plasmonics in chiral media [38][39][40][41][42] and non-reciprocal magneto-optics in waveguides. It is known that the parallel external magnetic field can rotate a spatially inhomogeneous intensity distribution (i.e. speckle-pattern) of light in the cross-section plane upon its propagation along an optical fiber [43][44][45][46]. Rec...

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One-way surface states due to nonreciprocal light-line crossing

Cited by 14 publications

References 42 publications

Realization of a magneto-optical near-zero index medium by an unpaired Dirac point

Realization of a magneto-optical near-zero index medium by an unpaired Dirac point

Magneto‐Plasmonics and Optical Activity in Graphene‐Based Nanowires

Plasmonics of magnetic and topological graphene-based nanostructures

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