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Terahertz Frequency- and Mode-Insensitive Broadband Quasi-optical Converter Antenna System

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Abstract

Recently emerged multimode gyrotron, a high-power broadband terahertz radiator, encounters the challenge of efficiently converting a series of operating whispering-gallery modes (WGMs) into free-space Gaussian beams. To this demand, we propose a frequency- and mode-insensitive antenna capable of broadband multimode converting. For a single mode, to achieve broadband operation, special reflector configuration and large-radius launcher guarantee the system high robustness to frequency-induced wave number variation. Furthermore, for a series of operating WGMs, in order to achieve multimode operation, high-order mode indices guarantees familiar field patterns and ray trajectories. In particular, high-purity Gaussian beams are simultaneously achieved in different WGMs of broad continuous bands, including 351–361 GHz for TE11,2 mode, 375–385 GHz for TE12,2 mode, and 398–410 GHz for TE13,2 mode. The results are verified by both the vector diffraction theory and the method of momentum. This kind of mode converter will promote the development of multimode gyrotrons and other antenna-feeder systems for high-power terahertz applications.

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Funding

This work is sponsored by the National Natural Science Foundation of China under contracts 61522101, 61531002, and 61471007, and in part by the Beijing NOVA program (No. Z161100004916057).

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Authors and Affiliations

  1. School of Electronics Engineering and Computer Science, Peking University, Beijing, China

    Hui-Qi Bian, Chao-Hai Du, Shi Pan & Pu-Kun Liu

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  1. Hui-Qi Bian
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  2. Chao-Hai Du
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  3. Shi Pan
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Correspondence to Chao-Hai Du.

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Bian, HQ., Du, CH., Pan, S. et al. Terahertz Frequency- and Mode-Insensitive Broadband Quasi-optical Converter Antenna System. J Infrared Milli Terahz Waves 39, 1065–1078 (2018). https://doi.org/10.1007/s10762-018-0523-1

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