PT Journal
AU Matyushkin, Y
   Danilov, S
   Moskotin, M
   Belosevich, V
   Kaurova, N
   Rybin, M
   Obraztsova, ED
   Fedorov, G
   Gorbenko, I
   Kachorovskii, V
   Ganichev, S
TI Helicity-sensitive plasmonic terahertz interferometer
SO Nano Lett.
JI Nano Lett.
PY 2020
BP 7296
EP 7303
VL 20
IS 10
DI 10.1021/acs.nanolett.0c02692
DE graphene; plasmonic interferometer; radiation helicity; terahertz radiation
AB Plasmonic interferometry is a rapidly growing area of research with a huge potential for applications in the terahertz frequency range. In this Letter, we explore a plasmonic interferometer based on graphene field effect transistor connected to specially designed antennas. As a key result, we observe helicity- and phase-sensitive conversion of circularly polarized radiation into dc photovoltage caused by the plasmon-interference mechanism: two plasma waves, excited at the source and drain part of the transistor, interfere inside the channel. The helicity-sensitive phase shift between these waves is achieved by using an asymmetric antenna configuration. The dc signal changes sign with inversion of the helicity. A suggested plasmonic interferometer is capable of measuring the phase difference between two arbitrary phase-shifted optical signals. The observed effect opens a wide avenue for phase-sensitive probing of plasma wave excitations in two-dimensional materials.
ER