AUTHOR=Zhang Yuhui , Shur Michael 

TITLE=Resonant THz detection by periodic multi-gate plasmonic FETs

JOURNAL=Frontiers in Physics

VOLUME=11

YEAR=2023

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2023.1170265

DOI=10.3389/fphy.2023.1170265

ISSN=2296-424X

ABSTRACT=<p>We show that a periodic multi-grated-gate structure can be applied to THz plasmonic FETs (TeraFETs) to improve the THz detection sensitivity. The introduction of spatial non-uniformity by separated gate sections creates regions with distinct carrier concentrations and velocities, giving rise to harmonic behaviors. The resulting frequency spectrum of DC voltage response is composed of “enhanced” and “suppressed” regions. In the enhanced region, the amplitude of response voltage can be enlarged up to ∼100% compared to that in a uniform channel device. The distribution pattern of those regions is directly related to the number of gate sections (<italic>N</italic><sub>s</sub>). A mapping of response amplitude in a <italic>N</italic><sub>s</sub>-frequency scale is created, which helps distinguish enhanced/suppressed regions and locate optimal operating parameters.</p>