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

Li, Xiang and Liu, Xiaoming and Alfadhl, Yasir and Ronald, Kevin and He, Wenlong and Cross, Adrian and Chen, Xiaodong (2016) A dual-frequency quasi-optical output system for a THz gyro-multiplier. IEEE Transactions on Terahertz Science & Technology, 6 (5). pp. 674-681. ISSN 2156-3446 (https://doi.org/10.1109/TTHZ.2016.2581982)

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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.


Li, Xiang, Liu, Xiaoming, Alfadhl, Yasir, Ronald, Kevin ORCID logoORCID: https://orcid.org/0000-0002-8585-0746, He, Wenlong ORCID logoORCID: https://orcid.org/0000-0001-7018-0527, Cross, Adrian ORCID logoORCID: https://orcid.org/0000-0001-7672-1283 and Chen, Xiaodong;