A terahertz (THz) hollow-core Bragg waveguide constructed by cascading waveguide units with supporting bridges (SPBs) on different air rings is proposed. The influence of the SPBs on the transmission loss of the waveguide is demonstrated numerically. Results show that the SPBs in the first air ring play the most important role in the transmission loss. By reasonably selecting the length ratio of the waveguide units, the waveguide absorption loss can be reduced to less than 0.4 dB / m in a wide bandwidth range of 0.53 to 0.73 THz, which is at least 2 orders lower than the material absorption loss.

中文翻译：

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具有轴向周期桥的太赫兹空心布拉格波导的设计与研究

提出了一种太赫兹 (THz) 空心布拉格波导，该波导由在不同空气环上具有支撑桥 (SPB) 的级联波导单元构成。数值证明了 SPB 对波导传输损耗的影响。结果表明，第一个空气环中的 SPB 在传输损耗中起最重要的作用。通过合理选择波导单元的长度比，可以在0.53～0.73 THz的宽带宽范围内将波导吸收损耗降低到0.4 dB/m以下，比材料吸收损耗至少低2个数量级。