中文摘要：

利用太赫兹时域光谱（THz-TDs）技术在0．3-2．0THz频率区间测量了不同碳黑含量（妒）的聚乙烯．碳黑复合材料光电性质随频率的变化及其与碳黑含量之间的关系．测量发现，随碳黑含量的增加，复合体系的吸收系数逐渐增大，并伴随折射率的相应增加．在碳黑含量确定的情况下，材料的吸收系数随频率的增加而增大，但折射率随频率的增加而略有减小．在假定复合体系中孤立碳黑颗粒在外电场作用下的极化过程是引起材料太赫兹频区介电损耗主要因素的情况下，利用德拜偶极子弛豫理论对聚乙烯．碳黑复合材料的介电行为进行了解释．

英文摘要：

Terahertz time-domain spectroscopic technique was applied to investigate the optical properties of polyethylene-carbon black composites in the frequency range of 0.3-2.0 THz as a function of frequency and volume fraction of the carbon black. It is found that the absorption coefficient and the refractive index of the composite increased with increase of carbon black content. At the same carbon black concentration, the absorption coefficient increased and the refractive index decreased with increase of frequency. The experimental measurements were analyzed by using Debye theory of dipole relaxation under the assumption that carbon black particles dispersed in the polyethylene matrix behave like dipoles and contribute mainly to the dielectric loss.