Extraction of optical constants in the terahertz band using material dispersion models  

作　　者：Jian Gu Jiaojiao Ren Dandan Zhang Lijuan Li 顾健;任姣姣;张丹丹;李丽娟(College of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130000,China;Zhongshan Institute of Changchun University of Science and Technology,Zhongshan 528436,China)

机构地区：[1]College of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130000,China [2]Zhongshan Institute of Changchun University of Science and Technology,Zhongshan 528436,China

出　　处：《Chinese Optics Letters》2022年第5期38-42,共5页中国光学快报（英文版）

基　　金：This work was supported by the Science and Technology Research Project of the Jilin Provincial Department of Education(No.JJKH20210823KJ)。

摘　　要：This study proposes a method based on material dispersion models to computationally simulate terahertz(THz)time-domain spectroscopy signals.The proposed method can accurately extract the refractive indices and extinction coefficients of optically thin samples and high-absorption materials in the THz band.This method was successfully used to extract the optical constants of a 470-μm-thick monocrystalline silicon sample and eliminate all errors associated with the Fabry-Perot oscillation.When used to extract the optical constants of a 16.29-mm-thick polycarbonate sample,our method succeeded in minimizing errors caused by the low signal-to-noise ratio in the extracted optical constants.

关 键 词：terahertz time-domain spectrum material optical constant Debye dispersion model 

分 类 号：O441.4[理学—电磁学] TB30[理学—物理]