溶胶—凝胶法制备CdS微晶掺杂TiO2／SiO2薄膜及其非线性光学特性

采用溶胶－凝胶方法在普通的载玻片上制备了ＣｄＳ微晶掺杂的ＴｉＯ２／ＳｉＯ２复合薄膜。用正硅酸乙酯、钛酸丁酯、醋酸镉作原料，比较了两种硫化剂：硫尿和硫代乙酰氨的硫化作用。Ｘ射线衍射谱和拉曼光谱揭示了ＣｄＳ微晶镶嵌在ＴｉＯ２／ＳｉＯ２薄膜的玻璃网络中。不同热处理温度、不同热处理时间的吸收光谱表明薄膜中存在着量子尺寸效应。采用Ｚ扫描技术测量了薄膜的非线性吸收及非线性折射率ｎ２＝－４．６７×１０－７ｅｓｕ。

Sol Gel Preparation and Optical Nonlinearity of CdS Microcrystallite Doped SiO 2/TiO 2 Thin Films

Sol gel technique was used to prepare thin films of CdS microcrystallite doped SiO 2/TiO 2 glass onto soda lime glass substrates. Ti(OBu 4), TEOS and Cd(CH 3COO) 2 were used as starting material for preparation of SiO 2/TiO 2 films in the attempt to optimize both thickness and optical properties. Thioacetamide and thiourea were used as internal source of sulfur to transform the Cd(CH 3COO) 2 into CdS to enhance nonlinear optical behaviors. The presence of the CdS microcrystallites in the films was verfied by using Raman spectroscopy. The evidence of size effects was apparent from the absorption spectrum of the thin films. The nonlinear refraction and nonlinear absorption of the thin films were tested by Z scan technique.