Graphene-based terahertz photodetector by noise thermometry technique

Journal Article · Mon Jan 20 04:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4862406· OSTI ID:22280629

Wang, Ming-Jye ^[1]; Wang, Ji-Wun ^[1]; Wang, Chun-Lun; Chiang, Yen-Yu; Chang, Hsian-Hong ^[1]

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1. Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, Taiwan (China)

We report the characteristics of graphene-based terahertz (THz) photodetector based on noise thermometry technique by measuring its noise power at frequency from 4 to 6 GHz. Hot electron system in graphene microbridge is generated after THz photon pumping and creates extra noise power. The equivalent noise temperature and electron temperature increase rapidly in low THz pumping regime and saturate gradually in high THz power regime which is attributed to a faster energy relaxation process involved by stronger electron-phonon interaction. Based on this detector, a conversion efficiency around 0.15 from THz power to noise power in 4–6 GHz span has been achieved.

• OSTI ID: 22280629
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON TEMPERATURE
ELECTRON-PHONON COUPLING
ELECTRONS
ENERGY CONVERSION
ENERGY EFFICIENCY
GHZ RANGE
GRAPHENE
NOISE
PHOTODETECTORS
PHOTONS
PUMPING
RELAXATION
THZ RANGE