Strong Plasmonic Enhancement of Photovoltage in Graphene

Details Strong Plasmonic Enhancement of Photovoltage in Graphene Strong Plasmonic Enhancement of Photovoltage in Graphene

2011-07-21

arxiv.org/abs/1107.4176v1

Nat. Commun. 2:458

Physics

Condensed Matter

Materials Science

Scientific paper

10.1038/ncomms1464 (2011)

Amongst the wide spectrum of potential applications of graphene, ranging from transistors and chemical-sensors to nanoelectromechanical devices and composites, the field of photonics and optoelectronics is believed to be one of the most promising. Indeed, graphene's suitability for high-speed photodetection was demonstrated in an optical communication link operating at 10 Gbit/s\cite. However, the low responsivity of graphene-based photodetectors compared to traditional III-V based ones is a potential drawback. Here we show that, by combining graphene with plasmonic nanostructures, the efficiency of graphene-based photodectors can be increased by up to 20 times, due to field concentration in the area of a p-n junction. Additionally, wavelength and polarization selectivity can be achieved employing nanostructures of different geometries.

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