Controlling photothermoelectric directional photocurrents in graphene with over 400 GHz bandwidth.

ABSTRACT: Photodetection in the near- and mid-infrared spectrum requires a suitable absorbing material able to meet the respective targets while ideally being cost-effective. Graphene, with its extraordinary optoelectronic properties, could provide a material basis simultaneously serving both regimes. The zero-band gap offers almost wavelength independent absorption which lead to photodetectors operating in the infrared spectrum. However, to keep noise low, a detection mechanism with fast and zero bias operation would be needed. Here, we show a self-powered graphene photodetector with a > 400 GHz frequency response. The device combines a metamaterial perfect absorber architecture with graphene, where asymmetric resonators induce photothermoelectric directional photocurrents within the graphene chann

SUBMITTER: Koepfli SM 

PROVIDER: S-EPMC11347599 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature