红外与毫米波学报2022，Vol.41Issue(6)：1022-1029,8.DOI:10.11972/j.issn.1001-9014.2022.06.011
Ti掺杂对Sb2Te3薄膜的结构及光学性质的调控
Regulation on microstructural and optical properties of Sb2Te3 films induced by titanium doping
摘要
Abstract
In this work,the doping effects of Ti on the structural,linear optical properties and nonlinear absorp? tion of Sb2Te3 thin films were systematically studied. A magnetron sputtering system and an annealing furnace are employed to prepare the crystalline Sb2Te3 samples with different doping concentrations of Ti. The X-ray photo? electron spectroscopy analysis confirmed that the Ti element exists in the Sb2Te3 films is in the form of TiTe2,in which the chemical state of Ti4+arises. For linear optical properties,the results indicate that the Ti dopant can im? prove the transmittance of the Sb2Te3 films,when a wide working wavelength is used in the nonlinear devices. The optical band gap decreases from 1. 32 eV to 1. 25 eV for the Ti-doped Sb2Te3 films,which is dependent on the reduction of carriers according to the Burstein-Moss theory. An open-aperture Z-scan system is set up to deter? mine the nonlinear saturated absorption of the film samples,which is excited by an 800 nm femtosecond laser at a power of 132 GW/cm2. Moreover,the adjustable behavior caused by Ti doping could be attributed to the competi? tion between the decrease in the optical band gap and the inhibition of the crystallization. Additionally,it is inter? esting to find that the Ti doping improves the laser damage threshold of the Sb2Te3 thin films from 188. 6 to 265. 5 GW/cm2. In general,the Ti-doped Sb2Te3 thin films have wide-ranging application possibilities for the field of nonlinear optical devices.关键词
钛掺杂/碲化锑薄膜/光学带隙/饱和吸收/开孔Z扫描Key words
Ti-dopant/Sb2Te3 thin film/optical band gap/saturable absorption/open-aperture Z-scan分类
数理科学引用本文复制引用
廖袁杰,张野,胡二涛,李晶,李耀鹏,宋晓晓,张欣彤,张书博,张腾飞,吕孟奇,刘镇,邹意蕴..Ti掺杂对Sb2Te3薄膜的结构及光学性质的调控[J].红外与毫米波学报,2022,41(6):1022-1029,8.基金项目
Supported by National Natural Science Foundation of China(60578047,61427815),Natural Science Foundation of Shanghai(17ZR1402200,13ZR1402600) （60578047,61427815）
