Complex frequencies and field distributions of localized surface plasmon modes in graphene-coated subwavelength wires

Cuevas, Mauro; Riso, Máximo; Depine, Ricardo A.

doi:10.1016/j.jqsrt.2016.01.006

Cited by 55 publications

(45 citation statements)

References 35 publications

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“…[23]. A good agreement between both formalisms is observed in this Figure. The spectral position of the multipolar plasmon resonances, at a frequency near 0.17µm −1 for the dipolar resonance and near 0.24µm −1 for the quadrupolar resonance, also agree well with those obtained from the quasistatic approximation for which the stationary plasmonic mode condition is fulfilled [24].…”

Section: Resultssupporting

confidence: 80%

“…This condition asserts that a plasmonic mode of a graphene-coated circular cylinder accommodates, along the cylinder circumference, an integer number of oscillation periods of the propagating surface plasmon corresponding to the flat graphene sheet [24]. This surface plasmon has been obtained in [33], and experimentally confirmed based on analysis of existing data by Merano [37], as a proper mode propagating with its electric and magnetic fields decaying exponentially away from the plane graphene sheet in two adjacent regions.…”

Section: Resultsmentioning

confidence: 75%

“…Since the electric field of the excited SPs reaches similar values inside and outside the graphene wire [24], and taking into account new possibilities of encapsulating single atoms, molecules and compounds into graphene wires [20,21], and the fact that, as a result of the van der Waals force, a graphene sheet can be tightly coated on a fiber surface [25], in that work we deemed appropriate to consider the case in which the optical emitter is localized inside the wire.…”

Section: Introductionmentioning

confidence: 99%

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Spontaneous emission in plasmonic graphene subwavelength wires of arbitrary sections

Cuevas

2018

Journal of Quantitative Spectroscopy and Radiative Transfer

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Abstract. We present a theoretical study of the spontaneous emission of a line dipole source embedded in a graphene-coated subwavelength wire of arbitrary shape. The modification of the emission and the radiation efficiencies are calculated by means of a rigorous electromagnetic method based on Green's second identity. Enhancement of these efficiencies is observed when the emission frequency coincides with one of the plasmonic resonance frequencies of the wire. The relevance of the dipole emitter position and the dipole moment orientation are evaluated. We present calculations of the near-field distribution for different frequencies which reveal the multipolar order of the plasmonic resonances.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Spontaneous emission in plasmonic graphene subwavelength wires of arbitrary sections

Cuevas

2018

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…We note that both dipolar resonances are blueshifted compared to those of the bare wire, in complete agreement with the fact that the net effect of the graphene coating is to increase the induced charge density on the cylindrical surface of the metallic wire [16,17].…”

Section: Wires Of Elliptic Sectionsupporting

confidence: 85%

“…We observe that numerical results obtained with the integral formalism (solid curves) and with the Mie solution (circles) are all again in excellent agreement. As explained in [10,16,17], the net effect of the graphene coating is to increase the charge density induced on the surface of the metallic particle, thus blueshifting the resonances of the metallic particle. • K, γc = 0.1 meV and µc = 0.5 eV.…”

Section: Wires Of Circular Sectionmentioning

confidence: 99%

Green formulation for studying electromagnetic scattering from graphene-coated wires of arbitrary section

et al. 2017

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We present a rigorous electromagnetic method based on Green's second identity for studying the plasmonic response of graphene-coated wires of arbitrary shape. The wire is illuminated perpendicular to its axis by a monochromatic electromagnetic wave and the wire substrate is homogeneous and isotropic. The field is expressed everywhere in terms of two unknown source functions evaluated on the graphene coating which can be obtained from the numerical solution of a coupled pair of inhomogeneous integral equations. To assess the validity of the Green formulation, the scattering and absorption efficiencies obtained numerically in the particular case of circular wires are compared with those obtained from the multipolar Mie theory. An excellent agreement is observed in this particular case, both for metallic and dielectric substrates. To explore the effects that the break of the rotational symmetry of the wire section introduces in the plasmonic features of the scattering and absorption response, the Green formulation is applied to the case of graphene-coated wires of elliptical section. As might be expected from symmetry arguments, we find a two-dimensional anisotropy in the angular optical response of the wire, particularly evident in the frequency splitting of multipolar plasmonic resonances. The comparison between the spectral position of the enhancements in the scattering and absorption efficiency spectra for low-eccentricity elliptical and circular wires allows us to guess the multipolar order of each plasmonic resonance. We present calculations of the near field distribution for different frequencies which explicitly reveal the multipolar order of the plasmonic resonances. They also confirm the previous guess and serve as a further test on the validity of the Green formulation.

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Optical diffraction radiation from a dielectric and a metal nanowire excited by a modulated electron beam

Yevtushenko

Dukhopelnykov²,

Nosich³

2019

Opt Quant Electron

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Complex frequencies and field distributions of localized surface plasmon modes in graphene-coated subwavelength wires

Cited by 55 publications

References 35 publications

Spontaneous emission in plasmonic graphene subwavelength wires of arbitrary sections

Spontaneous emission in plasmonic graphene subwavelength wires of arbitrary sections

Green formulation for studying electromagnetic scattering from graphene-coated wires of arbitrary section

Optical diffraction radiation from a dielectric and a metal nanowire excited by a modulated electron beam

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