6 dB terahertz coupler with Y-shaped plate for free space to transmission waveguide

IF 3.4 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION

Infrared Physics & Technology Pub Date : 2025-07-29 DOI:10.1016/j.infrared.2025.106043

Zhen Xu , Bohan Liang , Jining Li , Man Luo , Kai Chen , Kai Zhong , Degang Xu

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Abstract

This study designs a broadband terahertz coupler by combining a horn-shaped waveguide, a flat waveguide, and a rectangular cavity structure. The influence of different parameters of the structural coupler on the resonant frequency, coupling bandwidth, and coupling efficiency was analyzed. When the distance between the two plates varies within 100 μm, S21 is less than 6 dB in the frequency range of 0.126–0.822 THz, and the coupling bandwidth reaches 0.696 THz. When the length of the rectangular cavity is 100 μm, S21 is less than 5.3 dB in the range of 0.1–1 THz, and it can be used as a strong coupler; When the distance between plates is 900 μm, S21 within the range of 0.1–1 THz is less than 6 dB, which can achieve efficient coupling with an application bandwidth of at least 0.9 THz. Within the frequency range of 0.154–0.533 THz and 0.537–1 THz, both are less than 3 dB. Theoretical analysis and simulation both reveal that as the length of the flat plate increases, the resonant frequency gradually decreases. The maximum coupling efficiency obtained through the transmission terahertz time-domain spectroscopy system test is 76.97 %, which differs from the simulation results by only 6.3 %.

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6db太赫兹耦合器，y形板为传输波导提供自由空间

本研究采用角状波导、平面波导和矩形腔体结构相结合的方法设计了一种宽带太赫兹耦合器。分析了结构耦合器不同参数对谐振频率、耦合带宽和耦合效率的影响。当两板间距变化在100 μm以内时，在0.126 ~ 0.822 THz的频率范围内，S21小于6 dB，耦合带宽达到0.696 THz。当矩形腔长为100 μm时，S21在0.1-1 THz范围内小于5.3 dB，可以作为强耦合器使用；当片间距离为900 μm时，0.1-1 THz范围内的S21小于6 dB，可实现至少0.9 THz的应用带宽下的高效耦合。在0.154 ~ 0.533 THz和0.537 ~ 1 THz频率范围内，均小于3db。理论分析和仿真均表明，随着平板长度的增加，谐振频率逐渐减小。通过传输太赫兹时域光谱系统测试获得的最大耦合效率为76.97%，与仿真结果仅相差6.3%。

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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来源期刊

Infrared Physics & Technology 物理-光学

CiteScore

5.70

自引率

12.10%

发文量

400

审稿时长

67 days

期刊介绍： The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.