Spoof-Plasmon Instability in Terahertz Region Excited by Magnetized Electron Beam

Spoof plasmon is surface waves extended along corrugated surfaces and the terahertz equivalent of optical surface plasmon polaritons for metals. The spoof plasmon may be effectively excited by an electron beam. The beam is perturbed three-dimensionally during the interaction with the spoof plasmon....

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Bibliographic Details
Published in:IEEE transactions on plasma science 2021-01, Vol.49 (1), p.1-8
Main Authors: Ogura, Kazuo, Annaka, Yuta, Hoshi, Yukihisa, Takahashi, Toru
Format: Article
Language:English
Subjects:
3-D perturbation
Cherenkov instability
Cyclotrons
Electron beams
Electrons
Magnetic analysis
Magnetic devices
Magnetic fields
merged instability
Numerical analysis
Optical surface waves
Perturbation
Perturbation methods
Plasmons
Polaritons
Saddle points
saddle-point analysis
slow cyclotron (SC) instability
spoof plasmon
Stability
Stability analysis
Surface waves
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Summary:Spoof plasmon is surface waves extended along corrugated surfaces and the terahertz equivalent of optical surface plasmon polaritons for metals. The spoof plasmon may be effectively excited by an electron beam. The beam is perturbed three-dimensionally during the interaction with the spoof plasmon. In this work, we present numerical analysis on the spoof-plasmon instability driven by a magnetized electron beam in a terahertz region. The slow cyclotron as well as Cherenkov instabilities of the spoof plasmon are excited due to the 3-D perturbation. The two instabilities grow large and merge by increasing the beam current and decreasing the magnetic field. The merged instability divides again into the two instabilities for an extremely high beam current. The spoof-plasmon instabilities are examined by revealing modes involved using the saddle-point analysis.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2020.3011469