Abstract：
:Graphene has been identified as an emerging horizon for a nanoscale photonic platform because the Fermi level of intrinsic graphene can be engineered to support surface plasmons (SPs). The current solid back electrical gating and chemical doping methods cannot facilitate the demonstration of graphene SPs at the near-infrared (NIR) window because of the limited shift of the Fermi level. Here, we present the evidence for the existence of graphene SPs on a tapered graphene-silicon waveguide tip at a NIR wavelength, employing a surface carrier transfer method with molybdenum trioxides. The coupling between the graphene surface plasmons and the guiding mode in silicon waveguides allows for the observation of the concentrated field of the SPs in the tip by near-field scanning optical microscopy. Thus the hot spot from the concentrated SPs in the graphene layer can be used as a key experimental signature of graphene SPs. The NIR graphene SPs opens a new perspective for optical communications, optical sensing and imaging, and optical data storage with extreme spatial confinement, broad bandwidth and high tunability.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zhang Q,Li X,Hossain MM,Xue Y,Zhang J,Song J,Liu J,Turner MD,Fan S,Bao Q,Gu Mdoi
10.1038/srep06559subject
Has Abstractpub_date
2014-10-09 00:00:00pages
6559issn
2045-2322pii
srep06559journal_volume
4pub_type
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