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近年来,铁电薄膜的光学性质引起了许多研究者的注意.除较为常用的电光效应外,人们还发现了极化后的BaTiO_3薄膜在激光辐射下产生很强的二次谐波,表明这类材料在非线性光学领域有很好的应用前景.最近,我们利用sol-gel过程制备具有嵌埋结构的铁电薄膜——金属纳米微粒体系,发现这类新型材料具有很特殊的光吸收性质.本文对这类材料的二次非线性光学性质进行了研究,发现金属纳米微粒对铁电薄膜中二次谐波的产生有明显的增强作用.实验所用的样品为淀积在石英玻璃基片上的、嵌埋Ag纳米微粒的BaTiO_3薄膜,用sol-gel法制备,具体过程见文献[2].石英基片的厚度为lmm,面积约为1.5cm~2,利用局部腐蚀法和台阶测厚仪测得薄膜厚度在1.6～2.0μm之间.样品的极化过程在两块极
In recent years, the optical properties of ferroelectric thin films have attracted the attention of many researchers.In addition to the more commonly used electro-optical effect, it was also found that the polarized BaTiO 3 thin films produced strong second harmonic under laser radiation, indicating that Recently, we fabricated a ferroelectric thin film-metal nanoparticle system with embedded structure by sol-gel process and found that these new materials have very special properties of light absorption In this paper, the nonlinear optical properties of these materials have been studied and found that the metal nanoparticles on the ferroelectric thin film in the second harmonic generation was significantly enhanced.Experimental samples deposited on the quartz glass substrate , Embedded BaTiO_3 thin film of Ag nanoparticles prepared by sol-gel method, the specific process described in the literature [2]. The quartz substrate thickness of lmm, an area of about 1.5cm ~ 2, the use of local corrosion and step thickness The thickness of the film measured between 1.6 ~ 2.0μm, the polarization of the sample in the two poles