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Intense wideband terahertz amplification using phase shifted periodic electron-plasmon coupling

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2 Author(s)
Young-Min Shin ; Mountain Technology, 420 Red Hill Rd., Normandy, Tennessee 37360, USA ; Barnett, L.R.

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We report efficient wideband amplification of terahertz frequency electromagnetic waves from sequential electron-plasmon coupling along a half-period staggered double grating structure. Numerical eigenmode calculations show that the fundamental plasmonic band has a strong symmetric TE-mode, with a significant longitudinal electric field component, that is confined to the electron beam channel. A particle-in-cell simulation analysis with a single frequency excitation, combined with a short pulse broad spectrum drive, confirms that this terahertz plasmonic circuit produces three or four orders of magnitude power amplification with up to 30% bandwidth and 3%–5.5% saturated energy conversion efficiency.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 9 )

Date of Publication:

Mar 2008

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