The pseudo-magnetic field, an artificial synthetic gauge field, has attracted intense research interest in the classical wave system. The strong pseudo-magnetic field is realized in a two-dimensional photonic crystal (PhC) by introducing the uniaxial linear gradient deformation. The emergence of the pseudo-magnetic field leads to the quantization of Landau levels. The quantum-Hall-like edge states between adjacent Landau levels are observed in our designed experimental implementation. The combination of two reversed gradient PhCs gives rise to the spatially nonuniform pseudo-magnetic field. The propagation of the large-area edge state and the interesting phenomenon of the snake state induced by the nonuniform pseudo-magnetic field is experimentally demonstrated in a PhC heterostructure. This provides a good platform to manipulate the transport of electromagnetic waves and to design useful devices for information processing.

Unlike conventional topological edge states confined at a domain wall between two topologically distinct media, the recently proposed large-area topological waveguide states in three-layer heterostructures, which consist of a domain featuring Dirac points sandwiched between two domains of different topologies, have introduced the mode width degree of freedom for more flexible manipulation of electromagnetic waves. Until now, the experimental realizations of photonic large-area topological waveguide states have been exclusively based on quantum Hall and quantum valley-Hall systems. We propose a new way to create large-area topological waveguide states based on the photonic quantum spin-Hall system and observe their unique feature of pseudo-spin-momentum-locking unidirectional propagation for the first time in experiments. Moreover, due to the new effect provided by the mode width degree of freedom, the propagation of these large-area quantum spin-Hall waveguide states exhibits unusually strong robustness against defects, e.g., large voids with size reaching several unit cells, which has not been reported previously. Finally, practical applications, such as topological channel intersection and topological energy concentrator, are further demonstrated based on these novel states. Our work not only completes the last member of such states in the photonic quantum Hall, quantum valley-Hall, and quantum spin-Hall family, but also provides further opportunities for high-capacity energy transport with tunable mode width and exceptional robustness in integrated photonic devices and on-chip communications.

针对当前液晶显示器前壳缝隙开口处的填充材料工艺设计复杂的问题，选取高导电性的金属粒子填充层作为导电面层，碳布层作为屏蔽面层，柔性硅橡胶作为中间基体层，设计一种层状结构导电橡胶。通过结构设计实现了导电橡胶低硬度和高导电性的协同。结果表明，当硅橡胶的硬度为35，体积电阻率为0.01 Ω·cm时可满足显示器产品的密封、防水和电磁屏蔽应用要求。

损伤阈值测量装置是强激光技术的重要技术指标，主要用于强激光光学元件的研制和测试，而同步触发模块作为模块之间时序的控制器，是研制损伤阈值测量装置的关键技术之一。介绍了一种用于激光损伤阈值测量装置的同步触发模块及方法。设计了基于现场可编程门阵列（field programmable gate array，FPGA）为主控芯片的硬件方案，通过上位机操控软件设置同步触发参数，来控制各路输出同步信号的宽度和各路信号之间的时序，可极大提高同步触发的精度和效率。通过实验验证，同步脉冲信号之间的调节精度为2 ns，同步脉冲信号的最小宽度为10 ns，满足激光损伤阈值测量装置的要求。

为了满足高精度偏振探测要求，通道型偏振光谱仪在设计时需要考虑望远镜组偏振效应的影响，并对其进行相应的分析和优化。首先，分析望远镜组偏振效应的影响因素，采用坐标变换和穆勒矩阵连乘法建立了考虑膜系偏振效应的望远镜组穆勒矩阵模型，并带入通道型偏振光谱仪偏振解调模型。接着，通过同时控制S光和P光的透过率和相位延迟，设计相应的低偏振效应膜系。最后，运用偏振光线追迹的方法对镀有不同膜系的望远镜组进行偏振效应仿真。仿真结果表明，在580 nm和750 nm波长处，低偏振效应膜系与高偏振效应膜系的偏振探测精度变化不明显。而在420 nm波长处，低偏振效应膜系相较于常用膜系的边缘视场偏振探测精度提高了3.22%。低偏振效应膜系可以有效降低通道型偏振光谱仪望远镜组偏振效应，提高仪器的偏振探测精度。