高介电材料CaCu_3Ti_4O_(12)薄膜光学性能的研究  

Study on Optical Properties in High Dielectric Constant CaCu_3Ti_4O_(12) Thin Films

作　　者：陈爱平[1] 李伟[1] 顾骏[1] 朱劲松[1] 

机构地区：[1]南京大学固体微结构国家重点实验室

出　　处：《四川大学学报（自然科学版）》2005年第S1期289-291,共3页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(90207027);江苏省自然科学基金(BK2004084和BK2002410)

摘　　要：作者用脉冲激光沉积方法制备了CaCu_3Ti_4O_(12)薄膜,并用光学透射谱和Z扫描测量技术表征了CCTO薄膜的线性和非线性系数.结果发现,薄膜在600nm以上区域都具有很好的透光性,粗略估算出的光学带隙在3eV左右.在开孔Z扫描实验曲线中,透过样品的能量不随样品的位置而改变,说明该材料在弱光强下没有非线性吸收.而闭孔Z扫描曲线具有明显的先谷后峰形状,表明样品是自聚焦材料,非线性折射系数为正值.此外,由闭孔Z扫描曲线可得归一化曲线的峰谷差值ΔTyv=0.14,从而非线性折射系数为γ=5.0×10-13m2/W.CaCu_3Ti_4O_ 12 thin film was fabricated by using pulsed laser deposition technique. Its linear optical coefficient was obtained through optical transmittance measurements. It was found that the film shows good transparency above 600nm and the optical band gap (Eg) was estimated to be about 3eV. The nonlinear optical measurements were performed by using a top-hat Z-scan technique. The measured opened trace reveals that the film did not shows nonlinear absorption behavior at weak laser intensities. However, ...

关 键 词：CaCu_3Ti_4O_(12) 透射谱 非线性系数 

分 类 号：TB383[一般工业技术—材料科学与工程]