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Título: | Phonon-mediated mid-infrared photoresponse of graphene |
Autor: | Badioli, M.; Woessner, A.; Tielrooij, K. J.; Nanot, S.; Navickaite, G.; Stauber, Tobias CSIC ORCID; García de Abajo, Francisco Javier; Koppens, Frank H. L. | Palabras clave: | Surface phonon Mid-infrared photodetection Hot carriers Graphene-phonon interaction Graphene photodetection |
Fecha de publicación: | 12-nov-2014 | Editor: | American Chemical Society | Citación: | Nano Letters 14(11): 6374-6381 (2014) | Resumen: | The 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. | Versión del editor: | http://doi.org/10.1021/nl502847v | URI: | http://hdl.handle.net/10261/181674 | DOI: | 10.1021/nl502847v | ISSN: | 1530-6984 | E-ISSN: | 1530-6992 |
Aparece en las colecciones: | (ICMM) Artículos |
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