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Title

Phonon-mediated mid-infrared photoresponse of graphene

AuthorsBadioli, M.; Woessner, A.; Tielrooij, K. J.; Nanot, S.; Navickaite, G.; Stauber, Tobias ; García de Abajo, Francisco Javier ; Koppens, F. H. L.
KeywordsSurface phonon
Mid-infrared photodetection
Hot carriers
Graphene-phonon interaction
Graphene photodetection
Issue Date12-Nov-2014
PublisherAmerican Chemical Society
CitationNano Letters 14(11): 6374-6381 (2014)
AbstractThe photoresponse of graphene at mid-infrared frequencies is of high technological interest and is governed by fundamentally different underlying physics than the photoresponse at visible frequencies, as the energy of the photons and substrate phonons involved have comparable energies. Here, we perform a spectrally resolved study of the graphene photoresponse for mid-infrared light by measuring spatially resolved photocurrent over a broad frequency range (1000-1600 cm-1). We unveil the different mechanisms that give rise to photocurrent generation in graphene on a polar substrate. In particular, we find an enhancement of the photoresponse when the light excites bulk or surface phonons of the SiO2 substrate. This work paves the way for the development of graphene-based mid-infrared thermal sensing technology.
Publisher version (URL)http://doi.org/10.1021/nl502847v
URIhttp://hdl.handle.net/10261/181674
DOI10.1021/nl502847v
ISSN1530-6984
E-ISSN1530-6992
Appears in Collections:(ICMM) Artículos
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