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Terahertz Detection and Imaging Using Graphene Ballistic Rectifiers  Auteur(s): Anton Gregory, But D., Zhang Jiawei, Hill Ernie, Coquillat D., Consejo C., Nouvel Philippe, Knap W., Varani Luca, Teppe F., Torres Jeremie, Song Aimin
(Article) Publié:
Nano Letters, vol. 17 p.7015-7020 (2017)
Texte intégral en Openaccess : Ref HAL: hal-01710499_v1 PMID 29016145 DOI: 10.1021/acs.nanolett.7b03625 WoS: WOS:000415029000076 Exporter : BibTex | endNote 32 Citations Résumé: A graphene ballistic rectifier is used in conjunction with an antenna to demonstrate a rectenna as a terahertz (THz) detector. A small-area (<1 μm2) local gate is used to adjust the Fermi level in the device to optimize the output while minimizing the impact on the cutoff frequency. The device operates in both n- and p-type transport regimes and shows a peak extrinsic responsivity of 764 V/W and a corresponding noise equivalent power of 34 pW Hz–1/2 at room temperature with no indications of a cutoff frequency up to 0.45 THz. The device also demonstrates a linear response for more than 3 orders of magnitude of input power due to its zero threshold voltage, quadratic current–voltage characteristics and high saturation current. Finally, the device is used to take an image of an optically opaque object at 0.685 THz, demonstrating potential in both medical and security imaging applications. |
