Journal
NANO LETTERS
Volume 12, Issue 7, Pages 3808-3813Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl301774e
Keywords
Plasmonics; graphene; Fano resonances; hot electron; field enhancement
Categories
Funding
- Robert A. Welch Foundation [C-1220, C-1222]
- Office of Naval Research [N00014-10-1-0989]
- DoD NSSEFF [N00244-09-1-0067]
- Office of Naval Research through the MURI
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Nanoscale antennas sandwiched between two graphene monolayers yield a photodetector that efficiently converts visible and near-infrared photons into electrons with an 800% enhancement of the photocurrent relative to the antennaless graphene device. The antenna contributes to the photocurrent in two ways: by the transfer of hot electrons generated in the antenna structure upon plasmon decay, as well as by direct plasmon-enhanced excitation of intrinsic graphene electrons due to the antenna near field. This results in a graphene-based photodetector achieving up to 20% internal quantum efficiency in the visible and near-infrared regions of the spectrum. This device can serve as a model for merging the light-harvesting characteristics of optical frequency antennas with the highly attractive transport properties of graphene in new optoelectronic devices.
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