Published/Posted: September 25, 2018
Authors: Cai, X.; Sushkov, A. B.; Jadidi, M. M.; Gaskill, D. Kurt; Murphy, T. E.; Fuhrer, M. S.; Drew, H. DennisAbstract: A plasmon-enhanced terahertz graphene-based photodetec tor exhibits an increased absorption efficiency attained by utilizing a tunable plasmonic resonance in sub-wavelengths graphene micro-ribbons formed on SiC substrate in contact with an array of bi-metallic electrode lines. The orientation of the graphene micro-ribbons is tailored with respect to the array of sub-wavelengths bi-metallic electrode lines. The graphene micro-ribbons extend at the angle of approxi mately 45 degrees with respect to the electrode lines in the bi-metal electrodes array. The plasmonic mode is efficiently excited by an incident wave polarized perpendicular to the electrode lines, and/or to the graphene micro-ribbons. The absorption of radiation by graphene is enhanced through tunable geometric parameters (such as, for example, the width of the graphene micro-ribbons) and control of a carrier density in graphene achieved through tuning the gate voltage applied to the photodetector.
X. Cai, A. B. Sushkov, M. M. Jadidi, D. K. Gaskill, T. E. Murphy, M. S. Fuhrer and H. D. Drew, "Plasmon-enhanced terahertz graphene-based photodetector and method of fabrication" US Patent 10084102 (2018)