狄拉克材料表面等离激元的非线性吸收特性研究

以石墨烯为代表的狄拉克材料，具有宽频带的非线性吸收特性的优点，被广泛应用于可见光和红外激光技术领域。本项目将针对狄拉克材料在光频段激发SPPs和灵活调控SPPs的非线性吸收两个关键问题，主要研究激发SPPs的棱镜、光栅和近场三种耦合结构，外部电磁场和超表面微结构调控非线性吸收的机制以及基于Z扫描系统进行实验验证。以期获得高效激发SPPs的新型耦合结构，完善调控SPPs非线性吸收的理论模型，得出非线性吸收调控的量化指标。本项目的研究结果将为发展新型光子器件提供新途径，进一步拓展狄拉克材料在纳米光子学领域中的应用。

Graphene, as a typical Representative of Dirac material, can exhibit broadband nonlinear optical absorption effects, which has many applications in visible and infrared laser field. These two key issues will be resolved that is the excited SPPs of Dirac material in optical frequency band and the flexibly regulated nonlinear absorption. Moreover, the coupling structures of prism, grating and near field for exciting SPPs will be studied. Then, the nonlinear absorption characteristics and regulation of Dirac materials will be analyzed based on applied electric and magnetic field techniques and metasurface microstructure. That will be experimental investigated based on Z-scan system. Then, a new coupling structure for high efficiency excitation of SPPs is obtained. The nonlinear absorption theoretical models are improved and correspondence between the various structure parameters and nonlinear absorption properties is revealed. These results not only offer a new way to development of new photonic devices, but also expand the application of Dirac material in nanophotonics technology.