SnSe_(2)量子点复合凝胶玻璃非线性光学性能研究  

Nonlinear optical properties of SnSe_(2) quantum dot composite gel glass

作　　者：郑婵 王迪 黄丽 肖雪清 黄杏芳 ZHENG Chan;WANG Di;HUANG Li;XIAO Xueqing;HUANG Xingfang(School of Materials Science and Engineering,Fujian University of Technology,Fuzhou 350118,China;Institute of Biology and Chemistry,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建理工大学材料科学与工程学院,福建福州350118 [2]福建理工大学生物与化学研究院,福建福州350118

出　　处：《红外与激光工程》2024年第11期244-256,共13页Infrared and Laser Engineering

基　　金：福建省高校产学联合创新项目(2023H6035);福建省对外合作项目(2012I00211)。

摘　　要：由典型的二维层状材料衍生而来的量子点由于其独特的非线性光学(NLO)性能而引起了科学界的广泛关注,但绝大多数研究仍集中在液相基质中,不利于材料化和器件化。文中采用溶胶-凝胶法,将尺寸均一、分散均匀的SnSe_(2)量子点引入具有良好理化性能和光学透明性的二氧化硅凝胶玻璃基质中。采用透射电子显微镜(TEM)、场发射扫描电子显微镜(FESEM)、拉曼(Raman)光谱和紫外可见吸收光谱(UV/Vis)对所得SnSe_(2)量子点复合凝胶玻璃的形貌、组成、结构和线性光学性能系统表征。并采用开孔Z-扫描法对SnSe_(2)量子点复合凝胶玻璃在纳秒和皮秒激光脉冲下的非线性光学性能进行了研究。结果表明,当激光脉宽皮秒转变为纳秒时,SnSe_(2)量子点复合凝胶玻璃出现了从饱和吸收(SA)和反饱和吸收(RSA)的转变。且与相对应的悬浮液相比,SnSe_(2)量子点引入凝胶玻璃基质中后,其在皮秒下的SA和纳秒下的RSA性能均有所提高。此外,采用泵浦-探测技术和瞬态吸收光谱研究了SnSe_(2)量子点复合凝胶玻璃的超快载流子动力学过程。计算得到的SnSe_(2)量子点复合凝胶玻璃的NLO参数和弛豫时间与已报道的低维材料相当,证明该材料在非线性光学领域具有潜在的应用前景。Objective Quantum dots derived from typical two-dimensional layered materials have attracted widespread attention due to their unique optoelectronic properties.Compared with two-dimensional layered nanomaterials,quantum dots generally have better photochemical stability,higher solubility,and enhanced nonlinear optical(NLO)effects.However,most of the reported NLO performance of quantum dots prepared based on twodimensional layered materials focused on liquid-phase matrices.Although liquid matrix can quickly restore quantum dots after laser excitation,providing convenience for the study of nonlinear optical properties and mechanisms,which is not conducive to the material and device development of nonlinear optical materials.In addition,prolonged exposure of quantum dot suspensions to air inevitably leads to aggregation and structural damage,resulting in a decrease in their NLO performance.Therefore,if quantum dots can be introduced into the solid matrix,they can effectively prevent aggregation and isolate contact with air,thus effectively solving the above problems.In this paper,the two-dimensional layered tin diselenide(SnSe_(2))crystal is used as raw material,and SnSe_(2) quantum dots with uniform size and homogeneous dispersion were synthesized using liquid phase exfoliation method.Subsequently,the resulted SnSe_(2) quantum dots were introduced into the silica gel glass matrix with good physical and chemical properties and optical transparency by sol-gel wet chemical technology,and obtained SnSe_(2) quantum dot composite gel glass.And the potential application of the SnSe_(2) quantum dot composite gel glass in the field of nonlinear optics was explored.Methods The morphology,composition,structure and linear optical properties of the SnSe_(2) quantum dot composite gel glass were systematically characterized by transmission electron microscopy(TEM),field emission scanning electron microscopy(FESEM),Raman spectroscopy and ultraviolet visible absorption spectroscopy(UV/Vis).The nonlinear optical properties of SnSe_(

关 键 词：量子点 复合凝胶玻璃 Z-扫描法 饱和吸收 反饱和吸收 超快载流子动力学 

分 类 号：O437[机械工程—光学工程]