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Title: Current-driven detection of terahertz radiation using a dual-grating-gate plasmonic detector

We report on the detection of terahertz radiation by an on-chip planar asymmetric plasmonic structure in the frequency region above one terahertz. The detector is based on a field-effect transistor that has a dual grating gate structure with an asymmetric unit cell, which provides a geometrical asymmetry within the structure. Biasing the detector with a dc source-to-drain current in the linear region of the current-voltage characteristic introduces an additional asymmetry (electrical asymmetry) that enhances the detector responsivity by more than one order of magnitude (by a factor of 20) as compared with the unbiased case due to the cooperative effect of the geometrical and electrical asymmetries. In addition to the responsivity enhancement, we report a relatively low noise equivalent power and a peculiar non-monotonic dependence of the responsivity on the frequency, which results from the multi-plasmonic-cavity structure of the device.
Authors:
; ; ; ;  [1] ; ; ;  [2] ; ;  [3] ;  [4]
  1. Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai 980-8577 (Japan)
  2. RIKEN Sendai, 519-1399 Aramaki Aoba, Aoba-ku, Sendai 980-0845 (Japan)
  3. Kotelnikov Institute of Radio Engineering and Electronics (Saratov Branch), 410019 Saratov (Russian Federation)
  4. (Russian Federation)
Publication Date:
OSTI Identifier:
22303891
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 26; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; CAVITY RESONATORS; COOPERATIVES; CURRENTS; DETECTION; ELECTRIC POTENTIAL; EQUIPMENT; FIELD EFFECT TRANSISTORS; NOISE; PLASMONS; THZ RANGE