skip to main content

Title: Graphene-based terahertz photodetector by noise thermometry technique

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.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ; ; ;  [1]
  1. Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, Taiwan (China)
  2. (China)
Publication Date:
OSTI Identifier:
22280629
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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