Helicity-Sensitive Plasmonic Terahertz Interferometer
| Autor: | M. G. Rybin, M. Moskotin, Sergey Ganichev, Georgy Fedorov, Vsevolod Belosevich, Yakov Matyushkin, Natalia Kaurova, V. Kachorovskii, Elena D. Obraztsova, Ilya V. Gorbenko, Sergey Danilov |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Graphene Terahertz radiation business.industry Mechanical Engineering Astrophysics::Instrumentation and Methods for Astrophysics Physics::Optics Bioengineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Helicity law.invention Interferometry law Physics::Atomic and Molecular Clusters Optoelectronics General Materials Science 0210 nano-technology business Plasmon |
| Zdroj: | Nano letters. 20(10) |
| ISSN: | 1530-6992 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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