Published January 20, 2014 | Version v1
Journal article Metadata-only

Graphene-based terahertz photodetector by noise thermometry technique

Creators

  • 1. Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China)
  • 2. Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, Taiwan (China)
  • 3. Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan (China)

Description

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

Additional details

Identifiers

DOI
10.1063/1.4862406;

Publishing Information

Journal Title
Applied Physics Letters
Journal Volume
104
Journal Issue
3
Journal Page Range
p. 033502-033502.4
ISSN
0003-6951
CODEN
APPLAB

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
45101986
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ELECTRON TEMPERATURE; ELECTRON-PHONON COUPLING; ELECTRONS; ENERGY CONVERSION; ENERGY EFFICIENCY; GHZ RANGE; GRAPHENE; NOISE; PHOTODETECTORS; PHOTONS; PUMPING; RELAXATION; THZ RANGE
Descriptors DEC
BOSONS; CARBON; CONVERSION; COUPLING; EFFICIENCY; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; FREQUENCY RANGE; LEPTONS; MASSLESS PARTICLES; NONMETALS

Optional Information

Notes
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