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Terahertz and mid-infrared reflectance of epitaxial graphene

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Nascimento Santos, Cristiane [UCL] Joucken, Frédéric De Sousa Meneses, Domingos Echegut, Patrick Campos-Delgado, Jessica Raskin, Jean-Pierre [UCL] Hackens, Benoît [UCL]

Graphene has emerged as a promising material for infrared (IR) photodetectors and plasmonics. In this context, wafer scale epitaxial graphene on SiC is of great interest in a variety of applications in optics and nanoelectronics. Here we present IR reflectance spectroscopy of graphene grown epitaxially on the C-face of 6H-SiC over a broad optical range, from terahertz (THz) to mid-infrared (MIR). Contrary to the transmittance, reflectance measurements are not hampered by the transmission window of the substrate, and in particular by the SiC Reststrahlen band in the MIR. This allows us to present IR reflectance data exhibiting a continuous evolution from the regime of intraband to interband charge carrier transitions. A consistent and simultaneous analysis of the contributions from both transitions to the optical response yields precise information on the carrier dynamics and the number of layers. The properties of the graphene layers derived from IR reflection spectroscopy are corroborated by other techniques (micro-Raman and X-ray photoelectron spectroscopies, transport measurements). Moreover, we also present MIR microscopy mapping, showing that spatially-resolved information can be gathered, giving indications on the sample homogeneity. Our work paves the way for a still scarcely explored field of epitaxial graphene-based THz and MIR optical devices.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2016
Language Anglais
Journal information "Scientific Reports" - Vol. 6, no.6, p. 24301 (2016)
Peer reviewed yes
Publisher Nature Publishing Group (London)
issn 2045-2322
e-issn 2045-2322
Publication status Publié
Affiliations UCL - SST/IMCN/NAPS - Nanoscopic Physics
UCL - SST/ICTM/ELEN - Pôle en ingénierie électrique
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Bibliographic reference Nascimento Santos, Cristiane ; Joucken, Frédéric ; De Sousa Meneses, Domingos ; Echegut, Patrick ; Campos-Delgado, Jessica ; et. al. Terahertz and mid-infrared reflectance of epitaxial graphene. In: Scientific Reports, Vol. 6, no.6, p. 24301 (2016)
Permanent URL http://hdl.handle.net/2078.1/173588