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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 19 — Sep. 23, 2013
  • pp: 21951–21960

THz radiation from two electron-beams interaction within a bi-grating and a sub-wavelength holes array composite sandwich structure

Yaxin Zhang, Y. Zhou, and L. Dong  »View Author Affiliations

Optics Express, Vol. 21, Issue 19, pp. 21951-21960 (2013)

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Two electron-beams’ interaction in a sandwich structure composed of a bi-grating and a sub-wavelength holes array is suggested to generate THz radiation in this paper. It shows that this system takes advantage of both bi-grating and sub-wavelength holes array structures. The results demonstrate that surface waves on a bi-grating can couple with mimicking surface plasmons of a sub-wavelength holes array so that the wave-coupling is strong and the field intensity is high in this structure. Moreover, compared with the interaction in the bi-grating structure and sub-wavelength holes array structure, respectively, it shows that in this composite system the two electron-beams’ interaction is more efficient and the modulation depth and radiation intensity have been enhanced significantly. The modulation depth and efficiency can reach 22% and 4%, respectively, and the starting current density is only 12 A/cm2. This radiation system may provide good opportunities for development of multi-electron beam-driven THz radiation sources.

© 2013 OSA

OCIS Codes
(350.5610) Other areas of optics : Radiation
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

Original Manuscript: May 15, 2013
Revised Manuscript: August 23, 2013
Manuscript Accepted: August 26, 2013
Published: September 11, 2013

Yaxin Zhang, Y. Zhou, and L. Dong, "THz radiation from two electron-beams interaction within a bi-grating and a sub-wavelength holes array composite sandwich structure," Opt. Express 21, 21951-21960 (2013)

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