二维透射式Terahertz波时域谱成像研究

通过THz(Terahertz)波的相位信息和振幅信息来解析出样品某些可用于成像的参量；并且对THz波相位信息成像和振幅信息成像进行了比较.结果显示：当样品对THz波的吸收比较小时，利用THz波的相位信息进行成像比通过振幅信息进行成像质量要好一些；时域谱峰值位置的漂移会对相位信息成像产生较大的影响.实验中发现输出光谱中出现了劈裂现象，即由输入的单峰变成了双峰.分析表明，这一现象是由样品内部厚度或折射率突变导致的，该现象可用于THz波轮廓成像研究.

Investigation on Two-dimensional Transmission Imaging with Terahertz Wave by Time Domain Spectroscopy

Terahertz(THz) time domain spectroscopy includes abundant information about the sample,so the image for the structure of the sample can be reconstructed.How to resolve some sample parameters and reconstruct image using phase information and amplitude information of THz wave is investigated.A comparison between phase imaging and amplitude imaging is carried out.The results show:the quality of phase imaging is better than the quality of amplitude imaging if the absorbing of the sample is small;the excursion of the peak brings some effect on phase imaging.The splitting phenomenon of output spectroscopy is found in the experiments,namely THz time domain spectroscopy changes from one peak to two peaks.The analysis shows that this phenomenon results from abrupt change of the thickness or refractive index.This phenomenon can be used to study outline imaging in Thz field.