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Extraction of optical parameters of composite material for real-world THz application

机译：用于现实世界THZ应用的复合材料光学参数的提取

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摘要

Terahertz time-domain spectroscopy has emerged as a competent technique for real-world applications such as quality control in pharmaceutical and food industry, biomedical and precision-agriculture. However, investigating the optical response of the practical composite samples such as pharmaceutical tablets, biological composites and nano-composites using Terahertz (THz) time-domain spectroscopy (TDS) is quite challenging. In the present work, we have prepared two series of binary composites, with different volume fraction of constituent materials. These composites were probed using pulsed THz TDS and their dielectric response was modeled using the effective medium theory (EMT). Based on the volume fraction of the constituent material, three EMT models, including Maxwell-Garnet (MG), Polder-van-Santen (PvS) and Landau-Lifshitz-Looyenga (LLL), were compared empirically with the conventional analysis at different frequencies; and the accuracy and ambiguity of the extracted parameters using these quasi-static models were determined. Hence, the feasibility study of these theoretical models was discussed to assess their practicality.
机译：Terahertz时域光谱已经出现为实际应用的能力技术，例如药品和食品工业，生物医学和精密农业的质量控制。然而，使用Terrahertz（THz）时域光谱（TDS）研究了实用复合样品如药剂片，生物复合材料和纳米复合材料的实际复合材料样品的光学响应是非常具有挑战性的。在本作工作中，我们制作了两种系列二元复合材料，具有不同体积分数的组成材料。使用脉冲THz TDS探测这些复合材料，并且使用有效介质理论（EMT）建模它们的介电响应。基于组成材料的体积分数，在不同频率的常规分析的常规分析和麦克风 - 石榴石（MG），波德尔 - van-santen（PVS）和Landau-Lifshitz-Loyenga（LLL）包括三种EMT模型;确定了使用这些准静态模型的提取参数的精度和歧义。因此，讨论了这些理论模型的可行性研究以评估其实用性。

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