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**Harvard**

Wang, W. (2012) *Plasmons and optical excitations in graphene rings*.

** BibTeX **

@article{

Wang2012,

author={Wang, Weihua},

title={Plasmons and optical excitations in graphene rings},

journal={Journal of Physics-Condensed Matter},

issn={0953-8984},

volume={24},

issue={40},

abstract={A simple semiclassical drude-like conductivity of graphene is employed to describe plasmon excitations of graphene in the ring structures. A quasi-static self-consistent integral equation approach is performed, allowing the calculation of all the plasmon modes with different angular momentum l. Among them only the dipole modes (l = 1) will couple out to the radiation modes, which in turn can be excited optically by the plane waves, and the excitation energies as a function of the ratio of the radius of the inner hole to that of the outer ring have also been investigated. It is demonstrated that the energy of symmetric modes will monotonically decrease as the ratio rises, and the energy of antisymmetric modes does not exhibit a monotonically increasing behavior as in a three-dimensional metallic ring, but first reduces and then increases. These predictions are tested by full-wave simulations using the optical conductivity of graphene that was obtained from the random phase approximation (RPA).},

year={2012},

keywords={photonics },

}

** RefWorks **

RT Journal Article

SR Electronic

ID 165193

A1 Wang, Weihua

T1 Plasmons and optical excitations in graphene rings

YR 2012

JF Journal of Physics-Condensed Matter

SN 0953-8984

VO 24

IS 40

AB A simple semiclassical drude-like conductivity of graphene is employed to describe plasmon excitations of graphene in the ring structures. A quasi-static self-consistent integral equation approach is performed, allowing the calculation of all the plasmon modes with different angular momentum l. Among them only the dipole modes (l = 1) will couple out to the radiation modes, which in turn can be excited optically by the plane waves, and the excitation energies as a function of the ratio of the radius of the inner hole to that of the outer ring have also been investigated. It is demonstrated that the energy of symmetric modes will monotonically decrease as the ratio rises, and the energy of antisymmetric modes does not exhibit a monotonically increasing behavior as in a three-dimensional metallic ring, but first reduces and then increases. These predictions are tested by full-wave simulations using the optical conductivity of graphene that was obtained from the random phase approximation (RPA).

LA eng

DO 10.1088/0953-8984/24/40/402202

LK http://dx.doi.org/10.1088/0953-8984/24/40/402202

OL 30