Sunday, August 20, 2017

Abstract-Terahertz Scattering and Spectroscopic Characteristics of Polymethacrylimide Microstructures

Liyun Xing , Hong-Liang Cui * , Jing Bai * , Zhenxiong Zhou * , Qingyu Zhou * , Dongshan Wei , Chunlei Du , Jun Yin , Songnian Zhang

We carried out systematic measurements of Polymethacrylimide (PMI)’s Terahertz (THz) spectroscopic and scattering parameters with various thicknesses and models. The Terahertz time domain spectroscopy (THz-TDS) would be useful as a nondestructive testing (NDT) tool for PMI. While the index of refraction is very close to that of air, with flat frequency dependency, the attenuation constant exhibits a remarkable strong frequency variation, suggesting a scattering dominated attenuation process. Based on the Mie scattering model, we gave the satisfactory explanation: the THz wave propagating through the PMI suffer scattering from the micro sized particles, and the sizes of the particles (shown to obey a normal distribution) determine the frequency characteristics of the interaction.

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