Strong Dispersive Propagation of Terahertz Wave: Time‐Domain Self‐Consistent Modeling of Metallic Wall Losses,Advanced Theory and Simulations

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Strong Dispersive Propagation of Terahertz Wave: Time‐Domain Self‐Consistent Modeling of Metallic Wall Losses
Advanced Theory and Simulations ( IF 2.9 ) Pub Date : 2020-01-21 , DOI: 10.1002/adts.201900218
Zi‐Chao Gao ₁ , Chao‐Hai Du ₁ , Fan‐Hong Li ₁ , Shi Pan ₁ , Zi‐Wen Zhang ₁ , Pu‐Kun Liu ₁

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The dispersion characteristics of electromagnetic waves have led to a wide range of applications, such as pulse compression, superluminal propagation, wave tunneling effect, and electron–wave interaction. The near‐cutoff wave inside a guiding system is strong dispersive. When the wave frequency reaches the terahertz band, this strong dispersive property is extremely sensitive to the losses induced by the limited conductivity of the component. This phenomenon is traditionally investigated through perturbation of boundary conditions in the frequency domain, which does not deal well with broad‐spectrum signals. Two simple and efficient time‐domain schemes to study the strong dispersive propagation of terahertz waves are proposed. One is based on relatively concise principles, called the constant frequency method. The second is the recursive convolution method, which is suitable for dealing with a wave with wider spectrum range. The reliability of both approaches is verified by the comparison of the dispersion curves. Using the proposed methods, the pulse compression of terahertz wave inside a strong dispersive waveguide is verified in principle.

中文翻译：

太赫兹波的强色散传播：金属壁损的时域自洽建模

电磁波的色散特性导致了广泛的应用，例如脉冲压缩，超腔传播，隧穿效应和电子波相互作用。引导系统内部的近截止波具有很强的分散性。当波频率达到太赫兹频带时，这种强大的色散特性对组件有限的电导率引起的损耗极为敏感。传统上，这种现象是通过扰动频域中的边界条件来研究的，这不适用于广谱信号。提出了两种简单有效的时域方案来研究太赫兹波的强色散传播。一种是基于相对简洁的原理，称为恒频方法。第二种是递归卷积方法，适用于处理频谱范围更广的波。两种方法的可靠性通过色散曲线的比较得到验证。使用所提出的方法，原则上验证了强色散波导中太赫兹波的脉冲压缩。

更新日期：2020-03-04

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