Title:
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Phonon-Mediated Mid-Infrared Photoresponse of Graphene
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Author:
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Badioli, Michela; Woessner, Achim; Tielrooij, Klaas-Jan; Nanot, Sebastien; Navickaite, Gabriele; Stauber, T.; Garcia de Abajo, Javier; Koppens, Frank H. L.
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Other authors:
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Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques |
Abstract:
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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 midinfrared
thermal sensing technology. |
Subject(s):
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-Àrees temàtiques de la UPC::Física -Graphene -mid-infrared photodetection -graphene-phonon interaction -surface phonon -hot carriers -graphene photodetection -Grafè |
Rights:
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Document type:
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Article - Published version Article |
Published by:
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ACS Publications
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