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Pàgina inicial > Articles > Articles publicats > Electrical tunability of terahertz nonlinearity in graphene |
Data: | 2021 |
Resum: | Graphene is conceivably the most nonlinear optoelectronic material we know. Its nonlinear optical coefficients in the terahertz frequency range surpass those of other materials by many orders of magnitude. Here, we show that the terahertz nonlinearity of graphene, both for ultrashort single-cycle and quasi-monochromatic multicycle input terahertz signals, can be efficiently controlled using electrical gating, with gating voltages as low as a few volts. For example, optimal electrical gating enhances the power conversion efficiency in terahertz third-harmonic generation in graphene by about two orders of magnitude. Our experimental results are in quantitative agreement with a physical model of the graphene nonlinearity, describing the time-dependent thermodynamic balance maintained within the electronic population of graphene during interaction with ultrafast electric fields. Our results can serve as a basis for straightforward and accurate design of devices and applications for efficient electronic signal processing in graphene at ultrahigh frequencies. |
Ajuts: | European Commission 964735 European Commission 881603 European Commission 804349 European Commission 654220 Ministerio de Economía y Competitividad SEV-2016-81044 Ministerio de Economía y Competitividad FIS-2017-0706 Ministerio de Ciencia e Innovación CEX2019-000910-S Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1656 |
Drets: | 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. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Electronic signal processing ; Non-linear optical coefficients ; Opto-electronic materials ; Power conversion efficiencies ; Quantitative agreement ; Terahertz frequency range ; Thermodynamic balance ; Ultra-high frequency |
Publicat a: | Science advances, Vol. 7, issue 15 (April 2021) , art. eabf9809, ISSN 2375-2548 |
10 p, 1.0 MB |