银铜双金属纳米晶玻璃复合材料光学三阶非线性的研究

Third-order Optical Nonlinearities of Silver/Copper Bimetallic Nanoparticles Glass Composite Materials

采用离子交换结合氢气热处理方法,制备出银铜双金属纳米晶玻璃复合材料。利用光学吸收谱,光克尔技术和泵浦探测技术研究了银铜纳米晶玻璃复合材料的线性和三阶非线性光学性能。结果表明,在400nm银的表面等离子共振吸收峰附近,测得复合材料的三阶非线性极化率为1.7×10-9esu,光响应时间为皮秒级;在800nm处泵浦探测结果表明,银铜纳米颗粒尺寸增大使得复合玻璃材料快过程时间缩短和慢过程时间延长。

Ag-Cu nanoparticles glass composite materials were prepared by ion-exchange and subsequently thermal treatment method in H2 atmosphere. Optical absorption spectroscopy, optical Kerr effect and pump-probe techniques were used to measure linear and third-order optical nonlinear properties of the composite materials. The results indicate that the third-order susceptibility is 1.7×10^-9 esu by 400 nm pulse source while the optical response time is several picoseconds with Ag-Cu nanoparticles embedding in silicate glass. By 800 nm pumpprobe techniques, the time constant of the fast component accelerates while the time constant of the slow component decelerates due to Ag-Cu nanoparticle size increasing.