Reducing the Noise Impact During Extracting Materials' Optical Parameter From Terahertz Time-domain Spectroscopy

To analyze the terahertz (THz) information of materials,this paper mainly proposes a method of reducing the noise impact during extracting optical parameters of the sample from terahertz time-domain spectrum.By taking the case of Zn_0.90Cd_0.10Te〈110〉 single crystal as a sample,we detect and analyze its THz time-domain transmission spectroscopy.Specific calculation steps of extracting sample's THz band refractive index and absorption coefficient are provided.Using mathematical software,we get Zn_0.90Cd_0.10Te〈110〉 single crystal's refractive index and absorption coefficient in the THz band.In experiment data processing,we effectively reduce the noise impact,and this method can be widely used in THz transmission spectrum analysis.