2016/04/18 by V Ryzhii, M Ryzhii, M S Shur +3
Engineering · Materials Science · Physics and Astronomy · #Depletion region #Detector #Graphene #Graphene research and applications #Plasmon #Plasmonic and Surface Plasmon Research #Quantum tunnelling #Rectification #Responsivity #Terahertz radiation #Terahertz technology and applications #Transistor #cond-mat.mes-hall
paper · pdf · doi:10.1088/0022-3727/49/31/315103
13 pages, 8 figures
arxiv created 2016/04/18 · openalex created_date 2016/06/24 · openalex publication_date 2016/07/11 · arxiv updated 2016/08/03 · openalex updated_date 2026/08/05
We evaluate the proposed resonant terahertz (THz) detectors on the basis of field-effect transistors (FETs) with split gates, electrically induced lateral p–n junctions, uniform graphene layer (GL) or perforated (in the p–n junction depletion region) graphene layer (PGL) channel. The perforated depletion region forms an array of the nanoconstions or nanoribbons creating the barriers for the holes and electrons. The operation of the GL-FET- and PGL-FET-detectors is associated with the rectification of the ac current across the lateral p–n junction enhanced by the excitation of bound plasmonic oscillations in the p- and n-sections of the channel. Using the developed device model, we find the GL-FET- and PGL-FET-detector characteristics. These detectors can exhibit very high voltage responsivity at the THz radiation frequencies close to the frequencies of the plasmonic resonances. These frequencies can be effectively voltage tuned. We show that in PL-FET-detectors the dominant mechanism of the current rectification is due to the tunneling nonlinearity, whereas in the PGL-FET-detector the current rectification is primarily associated with the thermionic processes. Due to much lower p–n junction conductance in the PGL-FET-detectors, their resonant response can be substantially more pronounced than in the GL-FET-detectors corresponding to fairly high detector responsivity.