飞秒涡旋光激发下柔性过渡金属硫化物的光学选择定则及超快吸收光谱特性研究

The transition metal dichalcogenide (TMDC) is a two-dimensional materials with graphene-liked chemical structure. In recent years, the preparation and industrial application of TMDC become popular. However, the nonlinear optical properties such as the internal transition types and the optical selection rules of flexible TMDC materials irradiated by femtosecond optical vortex laser have not been studied yet.. In this study, we will perform flexible TMDC materials by using of the chemical vapor deposition method and will microscopic investigation of the structure characteristics of flexible TMDC materials by utilizing of novel optical measuring equipment (atomic force microscopy and scanning electron microscopy), at the same time we will develop a femtosecond optical vortex excited Z-scans optical setup. On the other hand, this project will systematically study nonlinear interaction between the femtosecond optical vortex and the flexible TMDC two-dimensional materials; the optical transition and optical selection rule properties of the TMDC materials under femtosecond optical vortex excitation; the effects of different excitation wavelengths and different excitation energies on the optical properties of TMDC materials, as well as the orbital angular momentum transfer mechanism from femtosecond vortex light to TMDC materials and so on. We will make PC simulation and combining the experimental results and theoretical fitting, qualitative analysis of carrier dynamics behaviors, element type, substrate dependence, and then establish a reasonable theoretical model to provide experimental and theoretical basis of nonlinear optical properties for similar two-dimensional materials under ultra-fast (femtosecond) vortex laser excitation.

过渡金属硫系化合物（TMDC）是一种化学结构与石墨烯类似的二维材料。近年来，二维材料的制备和其产业化应用步伐正在加快，但对于飞秒涡旋光激发下柔性TMDC材料内部跃迁类型和光学选择定则等非线性光学特性还没有研究过。.该项目将采用化学气相沉积法制备柔性TMDC材料，一方面将利用原子力显微镜、扫描电子显微镜等精确显微表征柔性TMDC材料和发展相应飞秒涡旋光超快Z扫描光学设备平台。另一方面将系统的研究飞秒涡旋光与柔性TMDC材料之间的相互作用；在飞秒涡旋光激发下材料的光学跃迁、光学选择定则、不同激发波长和不同激发能量对TMDC材料光学特性的影响、涡旋光轨道角动量向TMDC材料的转移规律和飞秒涡旋光激发下的超快稳态光谱等特性，并进行计算模拟。结合实验数据和理论拟合，定性分析基底的依赖关系，进而建立合理理论模型，为同类二维材料在超快涡旋光激发下非线性光学性质变化规律提供实验与理论基础。

精确的非线性光学构性关系和载流子弛豫特性研究对开发基于二维纳米材料的新型光电调制器件非常重要，该项目在前期工作基础上针对钙钛矿、PtS、InSe、PdSe2等层状及非层状半导体的非线性吸收、非线性折射等光学特性和超快动力学特性进行研究，揭示了其三阶非线性物理机制，提出并验证了非线性光学特性的调控策略，发展了相应的全光阈值器、光限幅器等调制器件和技术。.受本项目资助，共发表SCI论文9篇，包含：Nature Communications 1篇、Laser & Photonics Reviews 1篇、Advanced Optical Materials 2篇、Journal of Physicals Chemistry C 1篇、Optics Express 2篇、Optics Letters 1篇、Nanomaterials 1篇，国内会议口头报告7人次。培养博士研究生6人，其中已毕业博士4人，获“研究生国家奖学金”2人次、北京市优秀毕业生1人次。

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