Graphene Terahertz Photodetector

ORAL

Abstract

A graphene photodetctor device is fabricated using mechanically exfoliated single layer graphene on SiO2/Si substrate contacted by two dissimilar metal electrodes (chromium and gold) using standard electron beam lithography. The graphene is etched into a strip shape with specific width and coupled to a bow tie antenna structure to improve coupling to long-wavelength radiation and enhance the electric field in the center of the device. We have observed the response of the graphene photodetector to optical (632.8nm) and infrared laser (118um) radiation as a function of gate voltage and device width. Experimental results and comparison to a model of graphene plasmon-enhanced photodetction will be discussed.

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Authors

  • Xinghan Cai

    Center for Nanophysics and Advanced Materials, University of Maryland, College Park

  • Greg Jenkins

    Center for Nanophysics and Advanced Materials, University of Maryland, College Park

  • Andrei Sushkov

    Department of Physics, University of Maryland, College Park, MD 20742, MRSEC and CNAM, Department of Physics, University of Maryland, Department of Physics, University of Maryland, College Park, MD 20742, USA, Center for Nanophysics and Advanced Materials, University of Maryland, College Park

  • Jun Yan

    Center for Nanophysics and Advanced Materials, University of Maryland, College Park

  • Dennis Drew

    Center for Nanophysics and Advanced Materials, University of Maryland, College Park, CNAM, Physics Department, Universtity of Maryland

  • Michael S. Fuhrer

    Center for Nanophysics and Advanced Materials, University of Maryland, College Park, MD 20742, USA, University of Maryland, Center for Nanophysics and Advanced Materials, University of Maryland, College Park