Ultrafast Tunable Terahertz-to-Visible Light Conversion through Thermal Radiation from Graphene Metamaterials
Ilyakov, Igor (Helmholtz-Zentrum Dresden-Rossendorf)
Ponomaryov, Alexey (Helmholtz-Zentrum Dresden-Rossendorf)
Saleta Reig, David (Institut Català de Nanociència i Nanotecnologia)
Murphy, Conor (University of Exeter)
Mehew, Jake Dudley (Institut Català de Nanociència i Nanotecnologia)
de Oliveira, Thales V. A. G (Helmholtz-Zentrum Dresden-Rossendorf)
Prajapati, Gulloo Lal (Helmholtz-Zentrum Dresden-Rossendorf)
Arshad, Atiqa (Helmholtz-Zentrum Dresden-Rossendorf)
Deinert, Jan-Christoph (Helmholtz-Zentrum Dresden-Rossendorf)
Craciun, Monica Felicia (University of Exeter)
Russo, Saverio (University of Exeter)
Kovalev, Sergey (Helmholtz-Zentrum Dresden-Rossendorf)
Tielrooij, Klaas-Jan (Institut Català de Nanociència i Nanotecnologia)

Date:	2023
Abstract:	Several technologies, including photodetection, imaging, and data communication, could greatly benefit from the availability of fast and controllable conversion of terahertz (THz) light to visible light. Here, we demonstrate that the exceptional properties and dynamics of electronic heat in graphene allow for a THz-to-visible conversion, which is switchable at a sub-nanosecond time scale. We show a tunable on/off ratio of more than 30 for the emitted visible light, achieved through electrical gating using a gate voltage on the order of 1 V. We also demonstrate that a grating-graphene metamaterial leads to an increase in THz-induced emitted power in the visible range by 2 orders of magnitude. The experimental results are in agreement with a thermodynamic model that describes blackbody radiation from the electron system heated through intraband Drude absorption of THz light. These results provide a promising route toward novel functionalities of optoelectronic technologies in the THz regime.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Terahertz radiation ; Frequency conversion ; Ultrafast thermal emission ; Graphene ; Electrical gating ; Metamaterial
Published in:	Nano letters, Vol. 23, Issue 9 (May 2023) , p. 3872-3878, ISSN 1530-6992

DOI: 10.1021/acs.nanolett.3c00507
PMID: 37116109

7 p, 3.3 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles