Plasmon-enhanced terahertz graphene-based photodetector and method of fabrication

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. Dennis

Abstract: 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.

Citation:
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)

Manuscript: Cai-10084102-2018.pdf