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A Broadband Quasi-optical System for Measuring the Dielectric Properties in the Terahertz Band
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摘要: 该文针对太赫兹波段材料的介电参数提取的需求，利用准光学技术设计了一套宽带介电参数测量系统并讨论了自由空间的介电参数提取方法。通过平面扫描的方法验证了系统电磁传输特性。结果表明，准光系统的近场参数与设计结果相吻合。利用石英硼化玻璃和水样品进行了测试，并利用数值方法对介电参数进行提取。测试结果表明，利用准光方法测试所得到的介电参数与典型值相吻合，进一步验证了该方法的有效性。Abstract: To fulfill the requirements of the dielectric property measurement in the terahertz band, herein, a broadband quasi-optical system was designed and verified utilizing a planar scanning system. Additionally, the method of retrieving the dielectric parameters was discussed. Our experimental findings indicated that the measurement results were in good agreement with the theoretical results. Boron silicon, and deionized water were used for verifying the measurement, and the permittivity was obtained using a numerical method. We found that the dielectric properties were in good agreement with the typical values. This indicated that the proposed quasi-optical method effectively characterized the permittivity.
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Key words:
- Terahertz /
- Dielectric property /
- Broadband /
- Quasi-optical system
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图 1 利用准光器件可以将高斯波束转换成另外一个束腰半径的高斯波束
Figure 1. Transformation of Gaussian beam to another of different beam waist
图 2 高斯望远镜示意图。两个聚焦镜面的距离为两个聚焦镜面焦距之和
Figure 2. The diagram of a Gaussian telescope. The distance between the two focusing mirrors equals the sum of their focal lengths
图 3 波纹喇叭结构示意图及高斯波束束腰位置
Figure 3. Structure of a corrugated horn and the location of the beam waist
图 4 波纹喇叭的模式转换及模式场分布图
Figure 4. Mode transformation and filed distribution of a corrugated horn
图 8 准光系统工程模型图及实物图
Figure 8. The engineering model and fabricated photography of the quasi-optical system
图 9 90 GHz和325 GHz近场测试结果
Figure 9. The near-field measurement of 90 GHz and 325 GHz channels
图 10 90 GHz和325 GHz远场测试结果
Figure 10. The far-field measurement of 90 GHz and 325 GHz channels
图 11 单层介电参数提取理论模型
Figure 11. Theoretical model for dielectric retrieve of single layer sample
图 12 石英硼化玻璃在W波段和220～325 GHz频段的介电参数
Figure 12. The dielectric properties of boron silicon in the W band and the range of 220～325 GHz
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