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Gate-tuning of graphene plasmons revealed by infrared nano-imaging

FEI, Z ; RODIN, A. S ; FOGLER, M. M ; CASTRO, A. H ; LAU, C. N ; KEILMANN, F ; BASOV, D. N ; ANDREEV, G. O ; BAO, W ; MCLEOD, A. S ; WAGNER, M ; ZHANG, L. M ; ZHAO, Z ; THIEMENS, M ; DOMINGUEZ, G

Nature (London), 2012-07, Vol.487 (7405), p.82-85 [Revista revisada por pares]

London: Nature Publishing Group

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Gate-tuning of graphene plasmons revealed by infrared nano-imaging
Autor: FEI, Z ; RODIN, A. S ; FOGLER, M. M ; CASTRO, A. H ; LAU, C. N ; KEILMANN, F ; BASOV, D. N ; ANDREEV, G. O ; BAO, W ; MCLEOD, A. S ; WAGNER, M ; ZHANG, L. M ; ZHAO, Z ; THIEMENS, M ; DOMINGUEZ, G
Materias: Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Electric properties ; Electromagnetic Fields ; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures ; Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals ; Exact sciences and technology ; Experiments ; Graphene ; Graphite - chemistry ; Imaging systems ; Infrared Rays ; Methods ; Microscopy, Atomic Force ; Nanotechnology ; Nanotechnology - methods ; Optical properties ; Physics ; Plasmons (Physics) ; Static Electricity ; Surface and interface electron states ; Surface Properties ; Technology application
Es parte de: Nature (London), 2012-07, Vol.487 (7405), p.82-85
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descripción: Surface plasmons are collective oscillations of electrons in metals or semiconductors that enable confinement and control of electromagnetic energy at subwavelength scales. Rapid progress in plasmonics has largely relied on advances in device nano-fabrication, whereas less attention has been paid to the tunable properties of plasmonic media. One such medium--graphene--is amenable to convenient tuning of its electronic and optical properties by varying the applied voltage. Here, using infrared nano-imaging, we show that common graphene/SiO(2)/Si back-gated structures support propagating surface plasmons. The wavelength of graphene plasmons is of the order of 200 nanometres at technologically relevant infrared frequencies, and they can propagate several times this distance. We have succeeded in altering both the amplitude and the wavelength of these plasmons by varying the gate voltage. Using plasmon interferometry, we investigated losses in graphene by exploring real-space profiles of plasmon standing waves formed between the tip of our nano-probe and the edges of the samples. Plasmon dissipation quantified through this analysis is linked to the exotic electrodynamics of graphene. Standard plasmonic figures of merit of our tunable graphene devices surpass those of common metal-based structures.
Editor: London: Nature Publishing Group
Idioma: Inglés

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Gate-tuning of graphene plasmons revealed by infrared nano-imaging

FEI, Z ; RODIN, A. S ; FOGLER, M. M ; CASTRO, A. H ; LAU, C. N ; KEILMANN, F ; BASOV, D. N ; ANDREEV, G. O ; BAO, W ; MCLEOD, A. S ; WAGNER, M ; ZHANG, L. M ; ZHAO, Z ; THIEMENS, M ; DOMINGUEZ, G

London: Nature Publishing Group

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