Abstract In this paper, we investigate double slot waveguide configuration to explore the actively tunable electromagnetically induced transparency (EIT) effect in the terahertz regime. One of the slot structures is filled with a dielectric material of certain refractive index which causes a slight shift in the its resonance frequency as compared to the unfilled slot. The two frequencies say, ω 1 and ω 2 from the unfilled and filled slots, respectively act as the bright resonators. The EIT effect is observed due to the destructive interference of these two modes. The electric field profiles clearly indicate the emergence of the EIT effect. We observe that the transparency effect can be tuned by varying the refractive index of the dielectric material, which promises an active and tunable control of the effect without changing the physical dimensions. We have employed an analytical model based upon the coupled harmonic oscillators to understand the coupling mechanism between the two resonators resulting in EIT effect and validate numerical findings. The proposed study could be significant in the construction of tunable terahertz components such as slow light systems, buffers, etc. where an active control of optical properties is desirable.

中文翻译：

---

双槽太赫兹波导中电磁感应透明效应的可调控制

摘要 在本文中，我们研究了双槽波导配置，以探索太赫兹范围内的主动可调电磁感应透明 (EIT) 效应。其中一个槽结构填充有一定折射率的介电材料，与未填充的槽相比，这会导致其谐振频率发生轻微偏移。来自未填充和填充缝隙的两个频率即 ω 1 和 ω 2 分别充当明亮的谐振器。由于这两种模式的相消干涉，观察到 EIT 效应。电场分布清楚地表明 EIT 效应的出现。我们观察到可以通过改变介电材料的折射率来调整透明度效果，这承诺在不改变物理尺寸的情况下对效果进行主动和可调的控制。我们采用了基于耦合谐振子的分析模型来了解导致 EIT 效应的两个谐振器之间的耦合机制并验证数值结果。拟议的研究在构建可调谐太赫兹组件（如慢光系统、缓冲器等）方面可能具有重要意义，其中需要主动控制光学特性。