A dual-frequency quasi-optical output system for a THz gyro-multiplier

Xiang Li, Xiaoming Liu, Yasir Alfadhl, Kevin Ronald, Wenlong He, Adrian Cross, Xiaodong Chen

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
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This paper presents the investigation of a quasi-optical output system for a fourth-harmonic gyro-multiplier in the THz band through geometric optic analysis and three-dimensional full-wave simulation. The output system of the gyro-multiplier needs not only to transfer two high-order waveguide modes into the quasi-Gaussian beams, but also to separate the two beams. A dual-frequency quasi-optical mode converter (DQMC) and a frequency selective surface (FSS) are employed to achieve both goals within this system. Our study has shown that the optimal design of the DQMC requires a special mode selection in the gyro-multiplier. The high-pass FSS is designed, fabricated, and experimentally verified by a THz-TDS system. We have also demonstrated that the designed FSS is capable of handling the high-power output from the gyro-multiplier.

Original languageEnglish
Pages (from-to)674-681
Number of pages8
JournalIEEE Transactions on Terahertz Science & Technology
Issue number5
Early online date13 Jul 2016
Publication statusPublished - 30 Sept 2016


  • frequency selective surface (FSS)
  • gyro-multiplier
  • output systems
  • quasi-optical mode converter
  • mirrors
  • optical waveguides
  • scattering
  • geometrical optics
  • gyrotrons
  • harmonic analysis


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