In2S3量子点玻璃的制备及其三阶非线性光学性质

摘要

In2S3 quantum dots glass has been synthesized by both sol-gel and atmosphere control methods in this paper. The microstructures of In2S3 quantum dots in the glass was characterized by means of X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy dispersion X-ray spectra (EDX), high-resolution transmission electron microscopy (HRTEM), and selected-area electron diffraction (SAED). Meanwhile, the third-order nonlinear optical properties of the glass were measured in detail by the femtosecond Z-scan technique at a wavelength of 800 nm. The results showed that In2S3 quantum dots had formed in the glass, and the sizes of these In2S3 quantum dots having the tetragonal crystalline structure range from 12 nm to 20 nm, the glass exhibited the excellent third-order nonlinear optical properties, and the third-order nonlinear optical refractive index y, absorption coefficient β and susceptibility x (3) of the glass were determined to be -2.04×l0-18 m2 ·W-1 8.26×l0-12 m·W-1, and 1.61×10"20 m2·V"2, respectively.%本文利用溶胶-凝胶法结合气氛控制合成了含In2S3量子点玻璃.利用X射线粉末衍射仪(XRD),X射线光电子能谱(XPS),透射电子显微镜(TEM),X射线能量色散谱(EDX),高分辨透射电子显微镜(HRTEM)以及选区电子衍射(SAED)对In2S3量子点在玻璃中的微结构进行了表征,同时,利用飞秒Z-scan技术详细地研究了该玻璃在800 nm处的三阶非线性光学性质.结果表明,尺寸分布在12～20 nm之间的In2S3四方晶系纳米晶已经在玻璃中形成,并且,该玻璃展示出了优异的三阶非线性光学性能,其三阶非线性光学折射率γ、吸收系数β和和极化率x(3)分别为-2.04× 10-18 m2·W-1,8.26×10-12 m·W-1,和1.61×10-20 m2·V-2.