论文部分内容阅读
随着微电子学和光电子学的发展,信息处理要求存储材料具有极高的存储密度和极快的响应速度.近来理论研究表明,当半导体晶粒的尺寸小于10nm时,材料的三阶非线性极化率和快速响应速度都将提高.因而纳米复合材料可望成为一种优越的存储材料,并引起人们的广泛关注.1983年,Jain等在Cd(SSe)掺杂玻璃中观测到了较大的三阶非线性光学系数.1989年,Nogami等通过Sol-gel工艺制备了半导体掺杂的凝胶玻璃.我们也采用类似的工艺制备了CdS掺杂的凝胶玻璃,并观察了量子尺寸效应和非线性光学效应.但对这种纳米粒子掺杂形成的复合材料的结构,还缺乏了解.本文通过溶胶凝胶工艺,制备了ZnS分散在SiO_2玻璃中的纳米复合材料.采用XRD,TEM,RDF,Raman光谱对其结构进行了表征.并通过吸收光谱观察到了蓝移现象.利用简并四波混频(DFWM)方法测量了其三阶非线性光学系数.最后讨论了结构对性能的影响.
With the development of microelectronics and optoelectronics, information processing requires storage materials with extremely high storage density and extremely fast response speed.Recently, theoretical studies show that when the size of the semiconductor grains is less than 10 nm, the material's third-order nonlinearity The polarization rate and the fast response speed will be increased, so nanocomposites are expected to become a superior storage material, and cause widespread concern.In 1983, Jain et al observed in Cd (SSe) doped glass larger Third-order nonlinear optical constants. In 1989, Nogami et al prepared a semiconductor-doped gel glass by Sol-gel process. We also prepared a CdS-doped gel glass by a similar process and observed the quantum size effect And non-linear optical effect, but the structure of this composite material doped with nano-particles is still lack of understanding.In this paper, the nanocomposites with ZnS dispersed in SiO 2 glass were prepared by sol-gel process.Through XRD, TEM, RDF and Raman spectra were used to characterize the structure and the blue shift was observed by absorption spectrum.The third order nonlinear optical coefficient was measured by degenerate four wave mixing (DFWM) method.Finally, Impact on performance.