Enhancement of terahertz radiation in a Smith–Purcell backward-wave oscillator by an inverse wet-etched grating

A terahertz (THz) Smith–Purcell (SP) backward-wave oscillator with an inverse wet-etched grating based on silicon has been proposed to enhance radiation intensity. This grating strengthens the interactions between an electron beam and the evanescent wave due to the adjacent surface structure between...

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Bibliographic Details
Published in:Physics letters. A 2011-01, Vol.375 (3), p.589-592
Main Authors: Kim, Jung-Il, Jeon, Seok-Gy, Kim, Geun-Ju, Kim, Jaehong
Format: Article
Language:English
Subjects:
Backward-wave oscillator
Electric power generation
Evanescent waves
Inverse
Oscillators
Particle in cell technique
PIC simulation
Silicon
Simulation
Smith–Purcell
Solid state physics
Terahertz
Two dimensional
Wet-etched grating
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Summary:A terahertz (THz) Smith–Purcell (SP) backward-wave oscillator with an inverse wet-etched grating based on silicon has been proposed to enhance radiation intensity. This grating strengthens the interactions between an electron beam and the evanescent wave due to the adjacent surface structure between gratings that improves the magnitude of the electric field up to 1.7 times compared to the conventional rectangular gratings. A two-dimensional particle-in-cell (PIC) simulation shows that the radiated power is increased up to 2.3 times higher at the radiated frequency of 0.66 THz for an electron-beam energy of 30 keV.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2010.11.067