Switchable-coupling terahertz directional coupler operating at 100  GHz.

Applied optics Pub Date : 2025-09-10 DOI:10.1364/AO.570552
Zhen Zhang, Sen Qiu, Jikun Zhang, Xiongbin Liu, Wu Pan, Yandong Xiao, Xin Chen, Chaoyi Huang, Dandan Wen, Renpu Li, Xiaoyu Ma
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Abstract

In the frequency range of 90-110 GHz, we show a dynamically tunable terahertz directional coupler based on the phase transition properties of vanadium dioxide, allowing for a continuous coupling ration adjustment from -3 to -5dB. To validate the concept experimentally, we created two metallic-dielectric hybrid counterparts that mimic the coupling effects of the VO2 film in both its metallic (shielded branches) and extremely insulating (fully conductive branches) phase states. For -3 and -5dB coupler configurations, respectively, simulation results in the 90-110 GHz range show a coupling degree of -2.1 (0.7 dB imbalance) and -3.8dB (1.0 dB imbalance). The mode coupling dynamics in terahertz directional couplers were investigated through the branch-line waveguide theory, revealing the underlying transmission mechanism. The experimental results for the coupler's S-parameters were in relatively good agreement with the theoretical predictions. The switchable directional coupler proposed in this paper has applications in dynamic terahertz power allocation, terahertz imaging, and electromagnetic stealth.

工作在100ghz的切换耦合太赫兹定向耦合器。
在90-110 GHz的频率范围内,我们展示了一种基于二氧化钒相变特性的动态可调谐太赫兹定向耦合器,允许从-3到-5dB的连续耦合比率调整。为了在实验上验证这一概念,我们创建了两个金属-介电混合材料,模拟了VO2薄膜在金属(屏蔽分支)和极端绝缘(完全导电分支)相状态下的耦合效应。对于-3和-5dB耦合器配置,在90-110 GHz范围内的仿真结果显示耦合度分别为-2.1 (0.7 dB不平衡)和-3.8dB (1.0 dB不平衡)。利用分支波导理论研究了太赫兹定向耦合器的模式耦合动力学,揭示了其传输机理。对耦合器s参数的实验结果与理论预测吻合较好。本文提出的可切换定向耦合器在太赫兹动态功率分配、太赫兹成像和电磁隐身等方面具有广泛的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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