Accurate determination of dielectric permittivity of polymers from 75 GHz to 1.6 THz using both S-parameters and transmission spectroscopy

Chang Tianying; Zhang Xiansheng; Zhang Xiaoxuan; Cui Hong-Liang

摘要

Interactions of terahertz (THz) electromagnetic radiation with polymer materials have been studied recently with increasing depth and breadth, for purposes of both using polymers in fabricating THz optical components such as lenses, waveplates, waveguides, and sample holders/containers, and employing THz spectral imaging as a new tool for nondestructive testing of polymer composite structures. Either endeavor cannot even begin without a quantitative knowledge of the complex dielectric permittivity, i.e., the propagation and attenuation properties of such polymers in the requisite wave band. In this paper, a number of non-polar and non-magnetic polymers, such as polytetrafluoroethylene, polypropylene, high-density polyethylene, and polymethyl methacrylate, are studied for the purpose of determining their complex dielectric permittivity, including its real part and imaginary parts, in the wide frequency band from millimeter wave to THz wave (75 GHz-1.6 THz), in two ways. The first is a free space method based on a vector network analyzer covering the frequency region from 75 to 500 GHz, and the second is the THz time-domain spectroscopy (THz-TDS), effective for the region of 100 GHz-1.6 THz. The results are consistent with existing data (with discrepancies less than 1% in most cases for both the index of refraction and the absorption coefficient), and where they overlap in frequency coverage, the two methods yield identical results to within measurement error. (c) 2017 Optical Society of America

机译：最近已经通过制造透镜，波形，波导和样品保持器/容器如透镜，波形，波导和样品保持器/容器，并且采用THz光谱，最近通过增加深度和宽度来研究与聚合物材料的相互作用。成像作为聚合物复合结构的非破坏性测试的新工具。甚至不能在没有对复杂介电常数的定量知识的情况下开始，即这些聚合物在必要波带中的传播和衰减特性。本文研究了许多非极性和非磁性聚合物，例如聚四氟乙烯，聚丙烯，高密度聚乙烯和甲基丙烯酸甲酯，用于确定其复杂的介电介电常数，包括其真实部件和虚部，在从毫米波到THz波（75GHz-1.6 THz）的宽频带中，有两种方式。第一是基于覆盖75到500GHz的频率区域的矢量网络分析器的自由空间方法，第二是THz时域光谱（THz-TDS），对于100GHz-1.6 THz的区域有效。结果与现有数据一致（在大多数情况下，对于折射率和吸收系数的大多数情况下，在大多数情况下具有差异），并且在其频率覆盖范围内重叠，这两种方法在测量误差内产生相同的结果。（c）2017年光学学会

Accurate determination of dielectric permittivity of polymers from 75 GHz to 1.6 THz using both S-parameters and transmission spectroscopy

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