Plasmonic interferometer for spectroscopy of microwave radiation
V. M. Muravev, A. A. Fortunatov, A. A. Dremin, I. V. Kukushkin
Institute of Solid State Physics of the RAS, 142432 Chernogolovka, Russia
Abstract
We report the observation of photovoltage oscillations in
back-gated two-dimensional electron systems when tuning the
density under incident microwaves and in the absence of a magnetic
field. The oscillations are periodic in the inverse of the square
root of the density. They originate from the interference of
screened bulk plasmons with a linear dispersion. This phenomenon
can be exploited to devise a spectrometer-on-a-chip for millimeter
waves. The influence of a perpendicular magnetic field is
investigated and reveals a transformation of screened bulk
plasmons waves into screened edge magnetoplasmons.