Journal
NANO LETTERS
Volume 17, Issue 11, Pages 7015-7020Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b03625
Keywords
Graphene; rectenna; THz; ballistic transport; rectifier
Categories
Funding
- Terahertz Platform TOP
- National Key RAMP
- D Program of China [2016YFA0301200]
- Occitanie region via the Gepeto Terahertz platform
- National Natural Science Foundation of China [11374185]
- Engineering and Physical Sciences Research Council [EP/M507969/1, EP/G03737X/1, EP/N021258/1]
- Eranet-Rus-Plus European program Terasens
- Agence nationale de la Recherche project Integrated Nano-Detectors for terahertz Applications [ANR-13-NANO-0008]
- EPSRC [EP/N021258/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/N021258/1] Funding Source: researchfish
- Agence Nationale de la Recherche (ANR) [ANR-13-NANO-0008] Funding Source: Agence Nationale de la Recherche (ANR)
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A graphene ballistic rectifier is used in conjunction with an antenna to demonstrate a rectenna as a terahertz (THz) detector. A small-area (<1 mu m(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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