Optically tuned dielectric characteristics of SrTiO_(3)/Si thin film in the terahertz range  

作　　者：Bin Zou Qing-Qing Li Yu-Ping Yang Hai-Zhong Guo 邹斌;李晴晴;杨玉平;郭海中(School of Science,Minzu University of China,Beijing 100081,China;School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China;Optoelectronics Research Center,Minzu University of China,Beijing 100081,China;Collaborative Innovation Center of Light Manipulations and Applications,Shandong Normal University,Jinan 250358,China)

机构地区：[1]School of Science,Minzu University of China,Beijing 100081,China [2]School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China [3]Optoelectronics Research Center,Minzu University of China,Beijing 100081,China [4]Collaborative Innovation Center of Light Manipulations and Applications,Shandong Normal University,Jinan 250358,China

出　　处：《Chinese Physics B》2021年第10期617-623,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.62075248);the National Key R&D Program of China(Grant Nos.2017YFB0405400 and 2020YFB2009300);the Program for the Innovation Team of Science and Technology in University of Henan,China(Grant No.20IRTSTHN014).

摘　　要：Active control of the optical parameters in strontium titanate(SrTiO_(3),STO)thin films is highly desirable for tunable terahertz(THz)integrated devices such as filters,phase modulators,and electro-optical devices.In this work,optically tuned dielectric parameters of a STO thin film epitaxially grown on a silicon wafer were characterized in the THz region with an 800 nm laser pump-THz detection system.The refractive index,extinction coefficient,and complex dielectric constant of the STO thin film were calculated using thin-film parameter extraction.Owing to carrier transportation and soft-mode oscillation,the above optical parameters changed notably with the pump power of the external laser.This study is of great significance for rapid and non-contact THz phase-modulation technology and may serve as a powerful tool to tune the dielectric properties of the STO thin films.

关 键 词：terahertz spectroscopy optical constants STO/Si film 

分 类 号：O441.4[理学—电磁学] TB383.2[理学—物理]