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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 4 — Apr. 1, 2014
  • pp: 691–695

Manipulating propagating graphene plasmons at near field by shaped graphene nano-vacancies

Luping Du and Dingyuan Tang  »View Author Affiliations


JOSA A, Vol. 31, Issue 4, pp. 691-695 (2014)
http://dx.doi.org/10.1364/JOSAA.31.000691


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Abstract

Surface plasmons in graphene have many promising properties, such as high confinement, low losses, and gate-tunability. However, it is also the high confinement that makes them difficult to excite due to their large momentum mismatch with free-space mid-infrared light. We propose to use shaped graphene nano-vacancies to compensate for the momentum mismatch, revealing its high flexibility in graphene plasmon (GP) excitation and manipulation. We first examine the electromagnetic standing waves generated with a pair of straight vacancies, in order to verify the excitation of GPs and to illustrate their tunability with gate voltage. Plasmonic lenses are then designed to achieve the super-focusing of mid-infrared light and to generate plasmonic vortices in graphene. A0.0125λ0 hotspot is generated, far below the optical diffraction limit, hence revealing the capability of light control at deep-subwavelength scale.

© 2014 Optical Society of America

OCIS Codes
(130.3060) Integrated optics : Infrared
(220.3630) Optical design and fabrication : Lenses
(240.6680) Optics at surfaces : Surface plasmons
(080.4865) Geometric optics : Optical vortices

ToC Category:
Geometric Optics

History
Original Manuscript: November 12, 2013
Revised Manuscript: January 26, 2014
Manuscript Accepted: January 28, 2014
Published: March 11, 2014

Citation
Luping Du and Dingyuan Tang, "Manipulating propagating graphene plasmons at near field by shaped graphene nano-vacancies," J. Opt. Soc. Am. A 31, 691-695 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-4-691


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