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Título

Substrate-sensitive mid-infrared photoresponse in graphene

AutorFreitag, Marcus; Low, Tony; Martín-Moreno, Luis; Zhu, Wenjuan; Guinea, F. ; Avouris, Phaedon
Palabras clavePhonon polariton
Plasmon−phonon polariton
Graphene−substrate interaction
Graphene photodetector
Mid-infrared detector
Fecha de publicación2014
EditorAmerican Chemical Society
CitaciónACS Nano 8(8): 8350-8356 (2014)
ResumenWe report mid-infrared photocurrent spectra of graphene nanoribbon arrays on SiO2 dielectrics showing dual signatures of the substrate interaction. First, hybrid polaritonic modes of graphene plasmons and dielectric surface polar phonons produce a thermal photocurrent in graphene with spectral features that are tunable by gate voltage, nanoribbon width, and light polarization. Second, phonon polaritons associated with the substrate are excited, which indirectly heat up the graphene, leading to a graphene photocurrent with fixed spectral features. Models for other commonly used substrates show that the responsivity of graphene infrared photodetectors can be tailored to specific mid-IR frequency bands by the choice of the substrate. © 2014 American Chemical Society.
Versión del editorhttp://dx.doi.org/10.1021/nn502822z
URIhttp://hdl.handle.net/10261/120987
DOI10.1021/nn502822z
Identificadoresdoi: 10.1021/nn502822z
issn: 1936-0851
e-issn: 1936-086X
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