Metasurfaces with spin-selective transmission play an increasingly critical role in realizing optical chiral responses, especially for strong intrinsic chirality, which is limited to complex three-dimensional geometry. In this paper, we propose a planar metasurface capable of generating maximal intrinsic chirality and achieving dual-band spin-selective transmission utilizing dual quasi-bound states in the continuum (quasi-BICs) caused by the structural symmetry breaking. Interestingly, the value of circular dichroism (CD) and the transmittance of two kinds of circular polarization states can be arbitrarily controlled by tuning the asymmetry parameter. Remarkable CD approaching unity with the maximum transmittance up to 0.95 is experimentally achieved in the dual band. Furthermore, assisted by chiral BICs, the application in polarization multiplexed near-field image display is also exhibited. Our work provides a new avenue to flexibly control intrinsic chirality in planar structure and offers an alternative strategy to develop chiral sensing, multiband spin-selective transmission, and high-performance circularly polarized wave detection. The basic principle and design method of our experiments in the microwave regime can be extended to other bands, such as the terahertz and infrared wavelengths.

通过分子构型和分子间相互作用是调节材料的发光颜色和光物理性能的重要途径之一。本文以苯并噻二唑为受体（A）、三苯胺（TPA）和二甲基吖啶（DMAC）为给体（D），设计并合成了两种D-A-D和D-A-D′型的发光分子，分别为TBT和 DBT。两种分子均表现出同质多晶现象（TBT-O：λ_PL=593 nm 和TBT-R：λ_PL=616 nm；DBT-Y：λ_PL=570 nm，DBT-O：λ_PL=605 nm和DBT-R：λ_PL=642 nm）。在外界刺激下，对称结构的TBT为四色的可逆光色转换，非对称的DBT分子则表现为不可逆光色转换。本研究为基于苯并噻二唑类刺激响应发光材料提供了重要的分子设计思路。

在面阵扫描成像激光雷达中，阵列光束照明与棱镜扫描相结合实现了高能量利用率、高分辨率和宽探测视场，但阵列子光束倾斜入射棱镜，破坏了光束传输的旋转对称性，棱镜对子光束偏转能力存在差异，规则光束阵列产生了形状畸变，导致光束指向误差，影响点云位置精度。首先，将阵列光束与棱镜结合的圆锥扫描方式分解为多角度入射多波束并行扫描，通过所有子光束的传输特征来综合表征阵列光束传输特征；然后，采用三维矢量光学方法推导了阵列光束在棱镜中的传输过程，建立了子光束指向变化与棱镜扫描角度的关系；最后，通过对机载激光雷达棱镜扫描成像过程的数值仿真，建立了光束指向变化与点云数据质量的联系。仿真结果表明：阵列光束(3×3)棱镜扫描系统在航高0.5 km时，光束阵列畸变导致平面误差RMS约为5 cm，并随航高呈线性变化；斜率约为0.1 m/km，并随着阵列光束规模和子光束角间距增加点云平面精度随之下降。通过对棱镜扫描过程中光束阵列畸变规律掌握，为后续机载飞行试验数据的校正、阵列光束结合多棱镜扫描系统的设计提供了基础。

为满足多线、高空间分辨率激光雷达大数据量、高实时性、高可靠性要求，研究设计了一种基于Zynq-7000器件的激光雷达信息处理系统。硬件设计充分利用Zynq内部资源配置了多个、多种接口，外接简易电路即实现多个外设控制和状态监控。不同于常用的SMP （Symmetrical Multiprocessing）方式，Zynq内双ARM核处理器的软件设计采用更灵活的AMP （Asymmetric Multiprocessing）方式，两核一主一从独立运行裸机程序，其中主核完成数据处理的时序调度，并与从核以乒乓方式交替计算，双核协同优化改进，在完成了AD全波形匹配法与TDC相结合的高精度测距基础上，进一步设计并实现了实时的距离和强度校正算法，算法不仅研究了校正量与距离和强度的关系，还引入了温度和探测单元差异影响因素。经测试，64线激光雷达可探测处理三次回波，在120 m范围内的测距精度优于1.5 cm，强度数据更客观反映探测目标的特性，雷达单回波数据点率达到2 560 K点/s。

The Pancharatnam–Berry geometric phase has attracted great interest due to the elegant phase control strategy via geometric transformation of optical elements. The commonly used geometric phase is associated with circular polarization states. Here, we show that by exploiting the geometric phase associated with the two elliptical eigen-polarization states in a racemic metallic helix array, exotic features including full range phase modulation for linear polarization states, diverse polarization conversion, and full complex amplitude modulation can be obtained with rotation of the helices. As a proof of concept, several devices for implementing polarization conversion, vortex beam generating, and lateral dual focusing are built with a racemic helix array in the microwave regime. The calculated and experimental results validate our proposals, which can stimulate various advanced metadevices.

为了改善机载液晶显示器低温加热不均匀问题，提出了一种均匀加热的方法。首先，用COMSOL软件建立加热器模型和进行热仿真，得到了加热的功耗和温度分布图。接着做加热器低温加热实验，实验测量了温度值校正仿真模型边界的热对流系数，根据需求优化仿真加热器，设计了一种边缘温度高于中心区域的加热器，并根据仿真用等效占空比方式制作样品。最后将加热器样品组装整机，放置在实验箱做低温加热实验。结果表明温度分布均匀性较好，测试最大温差约为5 ℃左右，满足了设计要求，对机载特种显示器低温加热研究有一定参考意义。