采用溶胶-凝胶工艺制备TiO2薄膜.XRD结果表明所制备TiO2薄膜为锐钛矿结构.场发射SEM结果显示TiO2薄膜致密、无裂纹,晶粒尺寸约为60~100 nm,单层薄膜厚度约为50 nm,且膜厚随着热处理温度的升高而增大.采用椭圆偏振光谱仪测试了薄膜的椭偏参数ψ、△与波长λ的色散关系,选用Cauchy模型对TiO2薄膜的折射率、消光系数和厚度进行了拟合.结果表明当波长大于800 nm时,TiO2薄膜的折射率在2.09~2.20左右,消光系数约为0.026.并对不同热处理温度下制备的TiO2薄膜光学常数及厚度进行了分析讨论.
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