APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

Applied Physics Letters / Volume 100 / Issue 15 / NANOSCALE SCIENCE AND TECHNOLOGY

Appl. Phys. Lett. 100, 153106 (2012); http://dx.doi.org/10.1063/1.3701594 (3 pages)

A graphene electron lens

L. Gerhard1, E. Moyen2, T. Balashov1, I. Ozerov2, M. Portail3, H. Sahaf2, L. Masson2, W. Wulfhekel1, and M. Hanbücken2

1Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany
2CINaM-CNRS, Aix-Marseille University, Campus Luminy - Case 913, 18288 Marseille, France
3CRHEA-CNRS, Parc de Sophia - Antipolis, rue B. Gregory, 06560 Valbonne, France

View MapView Map

(Received 26 November 2011; accepted 20 March 2012; published online 10 April 2012)

An epitaxial layer of graphene was grown on a pre patterned 6H-SiC(0001) crystal. The graphene smoothly covers the hexagonal nano-holes in the substrate without the introduction of small angle grain boundaries or dislocations. This is achieved by an elastic deformation of the graphene by ≈0.3% in accordance to its large elastic strain limit. This elastic stretching of the graphene leads to a modification of the band structure and to a local lowering of the electron group velocity of the graphene. We propose to use this effect to focus two-dimensional electrons in analogy to simple optical lenses.

© 2012 American Institute of Physics

RELATED DATABASES

Scopus

View This Record in Scopus

Web of Science

View this record in Web of Science

View Web of Science related articles

KEYWORDS, PACS, and IPC

Keywords

electron lenses, graphene, nanophotonics

PACS

  • 41.85.Ne

    Electrostatic lenses, septa

  • 42.79.-e

    Optical elements, devices, and systems

International Patent Classification (IPC)

  • H01J37/26

    Electron or ion microscopes; Electron- or ion-diffraction tubes

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3701594

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.

    References

    N. Peres, Rev. Mod. Phys. 82, 2673 (2010).

    M. Mohr, K. Papagelis, J. Maultzsch, and C. Thomsen, Phys. Rev. B 80, 205410 (2009).

    S. Bero, A. Arnold, F. Evers, R. Narayanan, and P. Wölfle, Phys. Rev. B 82, 195445 (2010).


Figures (3)

Figures (click on thumbnails to view enlargements)

FIG.1
(a) Schematics of the patterning process of SiC(0001). Nano-holes are created on the SiC(0001) surface through a porous alumina mask. The wafer is then etched in hydrogen to form regular nano-holes of hexagonal shape. (b) SEM image of the patterned SiC(0001) wafer after hydrogen etching showing regular hexagonal holes with well defined facets.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(a) Large scale STM image of one nano-hole in the graphenized SiC(0001) wafer. The left inset shows the Fourier transform of the area in the dotted box. It displays a sixfold pattern caused by the mono-domain (1 × 1) structure of the few layer graphene. The right inset shows a low pass filtered image of the structure at the bottom of the hexagonal hole and reveals a (6 × 6) superstructure of the few layer graphene film. (b) Line section of the hole (c-j) show STM images of higher resolution at places indicated in (a). The (1 × 1) structure is clearly visible showing no dislocations or small angle domain boundaries even in the corner of the holes (j).

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
Calculated electron propagation through strained graphene lenses. All three lenses have the same outer diameter of 200 nm with varying depth as indicated in the figure. The side facets are inlined by 5, 6 and 7° for the holes of 2.5, 6, and 10 nm depth, respectively.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



Close

Google Calendar

ADVERTISEMENT

Your Recent History Recent History Help

Recently Viewed

  1. A graphene electron lens
Go to AIP Home   © AIP Publishing LLC
close