In this paper, a metallic terahertz (THz) plasmonic waveguide comprising subwavelength scale pillars is proposed. The pillars are periodically arranged in one dimension and are assumed to be metallic; on the top of the pillars, dielectric material is deposited. The fundamental guided resonant mode properties of the waveguide are comprehensively examined with and without dielectric material. Furthermore, guided modes are examined while varying the refractive index value (${n}$) of the dielectric material, and it is observed that resonant modes supported by the waveguide strongly depend on ${n}$ value of dielectrics. The dispersion relations of the guided modes are analyzed to ensure the plasmonic response. To support the numerical results, a Drude model is employed to fit the real and imaginary parts of the complex dielectric function for the proposed waveguide design. The group velocity of the fundamental guided terahertz mode is calculated in order to investigate slow-light properties of the terahertz wave. Additionally, the phase of transmission output and electric field profiles are studied in support of slow-light phenomena. The slow-light phenomenon using a dielectric–metal-based plasmonic waveguide could be very useful in construction of terahertz buffers, storage devices, terahertz sensors, detectors, etc.

中文翻译：

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在金属太赫兹等离子体波导中使用电介质的慢光应用。

本文提出了一种包含亚波长标度柱的金属太赫兹（THz）等离子体波导。支柱周期性地以一维排列，并假定是金属的。在支柱的顶部沉积介电材料。在有和没有介电材料的情况下，对波导的基本导向谐振模式特性进行了全面检查。此外，在改变介电材料的折射率值（$ {n} $）的同时检查了导模，并且观察到波导所支持的谐振模式强烈地取决于$ {n} $。电介质的值。分析了导模的色散关系，以确保等离子体响应。为了支持数值结果，对于拟议的波导设计，采用了Drude模型来拟合复介电函数的实部和虚部。为了研究太赫兹波的慢光特性，计算了基本制导的太赫兹模式的群速度。另外，为了支持慢光现象，研究了传输输出和电场分布的相位。使用基于介电金属的等离激元波导的慢光现象在太赫兹缓冲器，存储设备，太赫兹传感器，检测器等的构造中可能非常有用。