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By electrically tuning the Fermi level of the graphene
sheet, we demonstrate modulation of the guided light at frequencies
over 1GHz, together with a broad operation spectrum that ranges
from 1.35 to 1.6 mm under ambient conditions. The high modulation
efficiency of graphene results in an active device area ofmerely
25 mm2, which is among the smallest to date. This graphene-based
optical modulation mechanism, with combined advantages of compact
footprint, low operation voltage and ultrafast modulation
speed across a broad range of wavelengths, can enable novel
architectures for on-chip optical communications.

[ Last edited by daixj21 on 2011-6-2 at 11:12 ]
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