Enhancement of terahertz radiation in a Smith-Purcell backward-wave oscillator by an inverse wet-etched grating |
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Authors: | Jung-Il Kim Seok-Gy JeonGeun-Ju Kim Jaehong Kim |
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Affiliation: | Center for Pioneering Medical-Physics Research (CPMR), Korea Electrotechnology Research Institute, Ansan 426-170, Republic of Korea |
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Abstract: | 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. |
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Keywords: | Smith-Purcell Backward-wave oscillator Terahertz Wet-etched grating PIC simulation |
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