银纳米颗粒-玻璃复合材料的光学性能

Optical properties of Ag nanoparticle-glass composites

采用离子交换结合热处理法,制备出银纳米颗粒-硅酸盐玻璃复合材料。利用紫外-可见光分光光度计测量吸收光谱,利用Z-scan技术测量三阶非线性光学效应。研究结果表明,离子交换的最佳温度范围为310℃-380℃,提高离子交换温度和熔盐中AgNO_3浓度,延长离子交换时间,有利于在玻璃中引入更多的银离子。玻璃中引入的银离子浓度越高,高温热处理后玻璃中银纳米颗粒的体积分数越大。含铁玻璃有利于银纳米颗粒的形成。随着热处理温度的提高和时间的延长,银纳米颗粒尺寸和颗粒体积分数增大,共振吸收峰红移。通过离子交换结合热处理方法可以获得具有优良三阶非线性光学性能的银纳米颗粒-硅酸盐玻璃复合材料,其在非等离子体共振区域的三阶非线性系数可达1.16×10^(-10)esu,其中实部为-1.15×10^(-10)esu,虚部为1.4×10^(-11)esu。

Silver nanoparticles doped glass composites were prepared by ion - exchange plus thermal treatment. The optical properties of silver nanoparticle glass composites were investigated by UV - VIS spectrophotometer and Z - Scan technique. The results show that the optimal Ag ^＋/Na^＋ ion - exchange temperature is between 3100C and 380℃, higher ion - exchange temperature or higher AgNO3 concentration in molting bath or longer ion - exchange period favors the introduction of more Ag^＋ ions into soda - lime silicate glass. fraction of Ag The higher Ag^＋ concentration introduced into silicate glass is, the larger is the volume nanoparticles in glass after annealing. Fe2^＋ ion in silicate glass favors the formation of Ag nanoparticles. Ag nanoparticles size and volume fraction become larger, and plasma resonant absorption shows red - shit with increasing annealing temperature and extending annealing time. The off - resonant third -order optical susceptibility of Ag nanoparticle - glass composite exhibits a value of 1.16 × 10^-10 esu where the real part is -1.15 × 10^-10esu, and imaginary part is 1.4 × 10^-11 esu.