类H型结构的太赫兹带阻滤波器

陈祥雪; 付子亲; 王凤超; 陈进; 杨晶

doi:10.37188/CO.2023-0179

类H型结构的太赫兹带阻滤波器

doi: 10.37188/CO.2023-0179

cstr: 32171.14.CO.2023-0179

上海应用技术大学理学院, 上海 201418

基金项目: 上海应用技术大学协同创新基金（No. XTCX2020-12）；上海应用技术大学中青年科技人才发展基金（No. ZQ2022-6，No. ZQ2024-12）

详细信息

作者简介:
杨　晶（1990—），女，江苏淮安人，博士，讲师，硕士生导师，主要从事太赫兹时域光谱技术、太赫兹超材料器件及太赫兹生物学等领域方面的研究。E-mail：yangjingxqq@sit.edu.cn

中图分类号: TN248
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出版历程
- 收稿日期: 2023-10-11
- 修回日期: 2023-11-06
- 录用日期: 2023-12-13
- 网络出版日期: 2024-01-31

Terahertz band-stop filter with H-type structure

College of Sciences, Shanghai Institute of Technology, Shanghai 201418, China

Funds: Supported by Collaborative Innovation Fund, Shanghai Institude of Technology (No. XTCX2020-12); Youth Science and Technology Talent Development Fund, Shanghai Institude of Technology (No. ZQ2022-6, No. ZQ2024-12)

More Information

Corresponding author: yangjingxqq@sit.edu.cn

摘要

摘要:
本文基于对称的类H型结构设计了一种超材料太赫兹带阻滤波器，这种H型结构的连续金属臂可以流通电流。利用电磁仿真软件CST Microwave Studio 2021研究了该滤波器的滤波特性。通过改变H型双臂间距臂长、周期长度、双H间距离等，确定了滤波器的几何参数。结果表明，该结构可实现偏振选择的功能，在y偏振条件下，滤波器在0.2~2.3 THz范围内没有明显的谐振峰，但透过率范围在−15到−3 dB之间。而在x偏振条件下，在中心频率1.34 THz处可获得FWHM带宽为0.15 THz的一个阻带，传输参数约为−30 dB。最后，采用微加工工艺制备了超材料滤波器样品以验证仿真结果，使用透射式太赫兹时域光谱系统对样品进行测试，测试结果与仿真结果吻合较好。
- 太赫兹 /
- 超材料 /
- 类H型结构 /
- 带阻滤波器
Abstract:
In this paper, a terahertz band-stop filter based on a symmetrical H-type structure was designed, the continuous metal arms of which can flow current. By using electromagnetic simulation software CST Microwave Studio 2021, the filtering characteristics of the filter were studied, and the geometric parameters of the filter were determined by changing the arm length, period length and gap of double H. The results show that the filter can realize the tunable polarization properties. Under the y-polarization condition, the transmission spectrum has no obvious resonance peak in the range of 0.2−2.3 THz, but the intensity ranges from −15 dB to −3 dB. Under the x-polarization condition, a remarkably sharp dipole resonance valley occurs at 1.34 THz in the transmission spectrum, and the bandwidth and intensity are 0.15 THz and −30 dB, respectively. In order to verify the simulation results, the designed metamaterial filter was fabricated using micromachining technology, and the sample was tested by transmissed-terahertz time-domain spectroscopy (THz-TDS) system. The experiment results are in good agreement with the simulation results, which verifies the feasibility of this method.
- terahertz /
- metamaterial /
- H-type structure /
- band-stop filter

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图 1 太赫兹滤波器结构设计示意图

Figure 1. Structural diagram of the designed THz filter

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图 2 (a)透射系数仿真图；(b) 入射波沿x轴偏转位置和透射共振峰位置(f= 1.34 THz)处的电流分布

Figure 2. (a) Transmission coefficient simulation; (b) the current distribution of the incident wave at the x-axis deflection position and the transmission formant position (f= 1.34 THz)

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图 3 (a) 模拟不同内侧臂长度b下的传输特性；(b) 实线：模拟不同双臂间距l和周期长度p下的传输特性；虚线：模拟不同双H间距距离s和周期长度p下的传输特性

Figure 3. (a) Simulated transmission characteristics at different d; (b) soild line: simulated transmission characteristics under different arms spacing l and length p; dotted line: simulated transmission characteristics under different double H spacing distance s and length p

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图 4 (a)滤波器样品显微镜照片；(b)透射式THz-TDS系统示意图；(c)太赫兹透射频域信号；(d) 相对透过率谱线

Figure 4. (a) Microscope photo of filter sample; (b) schematic diagram of the transmission THz-TDS system; (c) terahertz transmission frequency domain signal; (d) relative transmittance spectra

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