Ultrafast refractive index control of a terahertz graphene metamaterial

Cited 41 time in webofscience Cited 0 time in scopus
  • Hit : 530
  • Download : 810
Modulation of the refractive index of materials is elementary, yet it is crucial for the manipulation of electromagnetic waves. Relying on the inherent properties of natural materials, it has been a long-standing challenge in device engineering to increase the index-modulation contrast. Here, we demonstrate a significant amount of ultrafast index modulation by optically exciting non-equilibrium Dirac fermions in the graphene layer integrated onto a high-index metamaterial. Furthermore, an extremely-large electrical modulation of refractive index up to Delta n similar to -3.4 (at 0.69 THz) is achieved by electrical tuning of the density of the equilibrium Dirac fermion in the graphene metamaterial. This manifestation, otherwise remaining elusive in conventional semiconductor devices, fully exploits the characteristic ultrafast charge relaxation in graphene as well as the strong capacitive response of the metamaterial, both of which enable us to drastically increase the light-matter interaction of graphene and the corresponding index contrast in the graphene metamaterials.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2013-07
Language
English
Article Type
Article
Keywords

TRANSITIONS

Citation

SCIENTIFIC REPORTS, v.3

ISSN
2045-2322
DOI
10.1038/srep02135
URI
http://hdl.handle.net/10203/175019
Appears in Collection
ME-Journal Papers(저널논문)
Files in This Item
000321287400006.pdf(2.58 MB)Download
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 41 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0