利用太赫兹时域光谱技术测量了聚乙烯、聚丙烯、聚氯乙烯、聚四氟乙烯和丙烯腈-丁二烯-苯乙烯的太赫兹透射谱，研究其在0.2~2.6 THz频段的光谱特性，得到了在室温氮气环境下这些材料的太赫兹吸收谱和折射率色散特性.发现这五种塑料在太赫兹波段的折射率和吸收系数差异显著，折射率分别在1.35~1.85之间，聚乙烯、聚丙烯、聚四氟乙烯吸收很小，相比之下聚氯乙烯、丙烯腈-丁二烯-苯乙烯吸收很大，这为塑料种类的鉴别及高太赫兹透过率塑料衬底选择提供了依据.

Using Terahertz time-domain spectroscopy technology, the transmission spectra of polyethylene, polypropylene, polyvinyl chloride, polytetrafluoroethylene and acrylonitrile - butadiene - styrene are measured. Spectral characteristics of these five materials between 0.2~2.6 THz are studied.The absorbance and refractive index spectra of five plastic at room temperature in nitrogen atmosphere are obtained. The results show that refractive index and absorption coefficient of these five plastic are significant different,and the refractive indexes are in the ranges from 1.35 to 1.85. Compared to polyvinyl chloride and acrylonitrile-butadiene-styrene, the absorbance of polyethylene, polypropylene and polytetrafluoroethylene are much smaller. The research provides a method to identify plastic types and choose substrate of terahertz optical components using terahertz time-domain spectroscopy.