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

Riccardo Degl'Innocenti, Long Xiao, David S. Jessop, Stephen J Kindness, Yuan Ren, Hungyen Lin, J. Axel Zeitler, Jack A. Alexander-Webber, Hannah J Joyce, Philipp Braeuninger-Weimer, Stephan Hofmann, Harvey E Beere, and David A. Ritchie

ACS Photonics, Just Accepted Manuscript

DOI: 10.1021/acsphotonics.6b00405

Publication Date (Web): September 20, 2016

Copyright © 2016 American Chemical Society

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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 μA/W and a noise-equivalent-power of ~1.5E-7W/Hz1/2