Terahertz Detection and Imaging Using Graphene Ballistic Rectifiers | Zendy

Gregory Auton | Zendy; Dmytro B. But | Zendy; Jiawei Zhang | Zendy; E.W. Hill | Zendy; Dominique Coquillat | Zendy; C. Conséjo | Zendy; P. Nouvel | Zendy; W. Knap | Zendy; L. Varani | Zendy; F. Teppe | Zendy; J. Torres | Zendy; Aimin Song | Zendy

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Terahertz Detection and Imaging Using Graphene Ballistic Rectifiers

Author(s) -

Gregory Auton,

Dmytro B. But,

Jiawei Zhang,

E.W. Hill,

Dominique Coquillat,

C. Conséjo,

P. Nouvel,

W. Knap,

L. Varani,

F. Teppe,

J. Torres,

Aimin Song

Publication year - 2017

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.7b03625

Subject(s) - terahertz radiation , responsivity , graphene , rectenna , detector , noise equivalent power , optoelectronics , cutoff frequency , materials science , rectifier (neural networks) , ballistic conduction , voltage , optics , saturation current , rectification , physics , electron , nanotechnology , computer science , stochastic neural network , quantum mechanics , machine learning , recurrent neural network , artificial neural network

A graphene ballistic rectifier is used in conjunction with an antenna to demonstrate a rectenna as a terahertz (THz) detector. A small-area (<1 μm 2 ) 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.

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