不等光程法太赫兹波段材料光学参数的精确测量

发布时间：2018-03-28 21:04

本文选题：太赫兹时域光谱技术　切入点：光学参数　出处：《红外与激光工程》2017年04期

【摘要】：近20年,太赫兹科学技术发展迅速,太赫兹波与物质之间的相互作用成为研究热点。理论推导并实验验证了一种提高太赫兹波段材料折射率、吸收系数等参数测量精度的方法。以两种厚度的高密度聚乙烯板(3.5 mm、5.0 mm)为样品,将不等光程测量法与常规太赫兹时域光谱测量方法进行比较,分别获得了0.5~2.5 THz频率范围的高密度聚乙烯的折射率和吸收系数,结果显示两种方法测量样品的折射率和吸收系数有较大的差异。常规法和不等光程法得到的折射率分别为1.505和1.483。常规法在1.465 THz附近出现一个峰值,而不等光程法得到的吸收系数在1.166 THz和2.431 THz出现特征吸收峰。证明不等光程法能更加精确提取材料光学参数,并可以揭示常规方法无法测得的材料特征吸收峰,为太赫兹波段精确测量材料光学参数提供了新的方法。
[Abstract]:With the rapid development of terahertz science and technology in the past 20 years, the interaction between terahertz wave and matter has become a hot topic. Two kinds of high density polyethylene (HDPE) plates with thickness of 3.5 mm ~ (5.0 mm) were used as samples. The unequal optical path measurement method was compared with the conventional terahertz time-domain spectroscopy method. The refractive index and absorption coefficient of HDPE in the frequency range of 0.5 ~ 2. 5 THz were obtained, respectively. The results show that the refractive index and absorption coefficient of the two methods are quite different. The refractive index obtained by conventional method and unequal path method are 1.505 and 1.483.The conventional method has a peak value near 1.465 THz. The absorption coefficients obtained by unequal optical path method have characteristic absorption peaks at 1.166 THz and 2.431 THz. It is proved that the unequal optical path method can extract the optical parameters of materials more accurately, and can reveal the characteristic absorption peaks of materials that can not be measured by conventional methods. It provides a new method for accurate measurement of material optical parameters in terahertz band.
【作者单位】：山东科技大学太赫兹研究中心青岛市太赫兹技术重点实验室;
【基金】：国家自然科学基金(61071016)
【分类号】：O433.1

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