Designing low-loss waveguides for terahertz waves is challenging as most materials are very lossy in this frequency band. Most scientists simply consider transmitting the waves through low-loss air, which however also has its own difficulties as index-guiding is not possible. In this paper, we report on the design of low-loss waveguides for terahertz waves and associated results by using a finite element leaky mode solver. These results show that waveguides designed using ARROW (anti-resonant reflecting optical waveguide) approach yield a low combined absorption and leakage loss down to only 0.05[Formula: see text]dB/cm for the q-TE[Formula: see text] fundamental mode using realistic values of refractive index at 1 THz operating frequency. The structure employs rectangular hollow-core and low-density polyethylene/air anti-resonant reflecting bilayers, which can be easily fabricated. These results are compared with those of other structures, i.e., a photonic crystal fiber-like structures using the same materials with rectangular holes, which is shown to give a higher loss of 3[Formula: see text]dB/cm and a suspended air-core waveguide with TOPAS vein offering a loss of 1[Formula: see text]dB/cm.

中文翻译：

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用于太赫兹波的具有矩形空心芯和矩形低密度聚乙烯/空气反射器的低损耗 ARROW 波导

为太赫兹波设计低损耗波导具有挑战性，因为大多数材料在该频段内的损耗非常大。大多数科学家只是简单地考虑通过低损耗空气传播波，但这也有其自身的困难，因为无法进行指数引导。在本文中，我们通过使用有限元泄漏模式求解器报告了太赫兹波的低损耗波导设计和相关结果。这些结果表明，使用 ARROW（抗谐振反射光波导）方法设计的波导产生的组合吸收和泄漏损耗低至仅 0.05[公式：见文本]d​​B/cm，对于 q-TE[公式：见文本]模式使用 1 THz 工作频率下的实际折射率值。该结构采用矩形空心和低密度聚乙烯/空气抗共振反射双层，易于制造。将这些结果与其他结构的结果进行比较，即使用具有矩形孔的相同材料的光子晶体纤维状结构，显示出更高的损耗 3[公式：见文本]d​​B/cm 和悬浮空气具有 TOPAS 静脉的芯波导提供 1[公式：见文本]d​​B/cm 的损耗。