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Fast room temperature detection of terahertz quantum cascade lasers with graphene loaded bow-tie plasmonic antenna arrays

Research output: Contribution to journalJournal article

Published
  • Riccardo Degl'innocenti
  • Long Xiao
  • David S Jessop
  • Stephen J. Kindness
  • Yuan Ren
  • Hungyen Lin
  • J. Axel Zeitler
  • Jack Alexander-Webber
  • Hannah Joyce
  • Philipp Braeuninger-Weimer
  • Stephan Hofmann
  • Harvey E. Beere
  • David A. Ritchie
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<mark>Journal publication date</mark>19/10/2016
<mark>Journal</mark>ACS Photonics
Issue number10
Volume3
Number of pages7
Pages (from-to)1747-1753
Publication statusPublished
Early online date20/09/16
Original languageEnglish

Abstract

We present a fast room temperature terahertz detector based on interdigitated bow-tie
antennas contacting graphene. Highly efficient photodetection was achieved by using two metals
with different work functions as the arms of a bow-tie antenna contacting graphene. Arrays of the
bow-ties were fabricated in order to enhance the responsivity and coupling of the incoming light to
the detector realizing an efficient imaging system. The device has been characterized and tested
with a terahertz quantum cascade laser emitting in single frequency around 2 THz yielding a
responsivity of ~ 34 A/W and a noise-equivalent-power of ~1.5E-7W/Hz1/2