基于硅凝胶玻璃掺杂MoS2的非线性光学响应研究

Nonlinear Optical Response of MoS2 Foped Dilica Gel Glass

摘要:

二硫化钼（MoS₂）非线性光学特性的研究大多在液态基质中进行，但不容忽视的是，溶液测试环境与实际应用环境之间存在显著差异。相较之下，当将材料嵌入固态光学基质中时，不仅能有效地将其与外部环境隔离，还避免了潜在的聚集现象发生，同时还能显著增强其稳定性。采用溶胶-凝胶法，以正硅酸四乙酯（TEOS）、3-缩水甘油三甲氧基硅烷（GPTMS）和（3-氨基丙基）三乙氧基硅烷（APTES）作为基体，将MoS₂引入二氧化硅（SiO₂）凝胶网络中，通过水解和缩聚反应制备了MoS₂/SiO₂凝胶玻璃。通过场发射扫描电子显微镜、傅里叶变换红外光谱、同步热分析仪和紫外可见光谱等，对MoS₂/SiO₂凝胶玻璃的表面特征、结构、化学组成和线性光学性质进行研究。结果表明，通过先驱体的水解缩聚可将MoS₂成功引入到SiO₂凝胶玻璃中，所得凝胶玻璃具有良好的均匀性和高透明性。采用波长为532 nm的开孔Z扫描技术，研究了固体和液体介质中MoS₂的非线性光学特性。结果表明，MoS₂发生了由液相中的饱和吸收（SA）向固态基质中的完全反饱和吸收（RSA）的转变，通过调节凝胶玻璃基质中MoS₂的浓度，可优化凝胶玻璃的非线性光学（NLO）和光限幅（OL）性能。研究MoS₂在固态三维宏观结构中的NLO和OL反应，对于推动固相光子器件和光电子器件的实际发展提供了实验依据及理论基础。

Abstract:

Most research on molybdenum disulfide （MoS₂） has been conducted in liquid matrices， but it cannot be ignored that there are significant differences between the solution testing environment and the actual application environment. In contrast， embedding the material into a solid-state optical matrix， we are able to effectively isolate it from the external environment， which not only avoids potential aggregation but also significantly enhances its stability. Using tetraethyl orthosilicate （TEOS）， 3-glycidyl trimethoxysilane （GPTMS） and （3-aminopropyl） triethoxysilane （APTES） as matrix， MoS₂ was introduced into silica （SiO₂） gel network via the sol-gel method， and MoS₂/SiO₂ gel glass was prepared by hydrolysis and polycondensation. The surface characteristics， structure， chemical composition and linear optical properties of MoS₂/SiO₂ gel glass were studied by means of field emission scanning electron microscope， Fourier transform infrared spectroscopy， synchronous thermal analyzer and ultraviolet visible spectroscopy. The results show that MoS₂ can be successfully introduced into the SiO₂ gel glass through the hydrolysis and polycondensation of the precursor， and the obtained gel glass has good uniformity and high transparency. The nonlinear optical properties of MoS₂ in solid and liquid media were studied using an open hole Z-scan technique with a wavelength of 532 nm. It was found that MoS₂ underwent an interesting phenomenon of transition from saturation absorption （SA） in the liquid phase to complete anti-saturation absorption （RSA） in the solid matrix. At the same time， the nonlinear optical （NLO） and optical limiting （OL） properties of the gel glass can be optimized by adjusting the concentration of MoS₂ in the gel glass matrix. Therefore， studying the NLO and OL reactions of MoS₂ in solid-state three-dimensional macroscopic structures provides experimental basis and theoretical basis for promoting the practical development of solid-state photonic devices and optoelectronic devices.