Owing to their unique optical properties and new degrees of freedom, orbital angular momentum (OAM) beams have been applied in various fields. Detection of the topological charges (TCs) of OAM beams is the key step for their applications. However, on-chip sorting of OAM beams with large TCs still remains a challenge. In this paper, Bloch surface wave (BSW) structures with five semi-ring shaped nanoslits are modeled. A spatial separation of 135 nm on the chip is obtained between two neighboring OAM states. OAM beams with TCs up to 35 can be successfully sorted by the BSW structures, which is much larger than that using metallic structures (only seven). BSW structures exhibit better OAM sorting performances than metallic structures. We systematically show how the lower attenuation of BSW structures leads to far superior separation ability compared to surface plasmons propagating on metallic structures. In addition, sorting of two OAM beams with different TCs simultaneously can be achieved in this way. Our results reveal that BSW structures should be an excellent solution for OAM sorting with large TCs, which is beneficial for applications in integrated on-chip devices and optical communications.

为了测量作用位置可变的大量程矢量力，设计了多点支撑式压电测力仪。对不同作用点下测力仪的灵敏度差异性进行分析和预测，以实现精准测量变作用位置的大量程矢量力的目标。对造成测力仪不同测试位置的灵敏度差异的影响因素进行分析，得到测力仪工作面域内不同作用点下的灵敏度与测力单元力电转换系数之间的关系。进行三向变加载点标定实验，获得不同作用点下测力仪的灵敏度实验值。建立LS-SVM预测模型，利用变加载点实验结果对模型进行训练。验证实验表明，该模型预测的不同作用点下的测力仪灵敏度值与真实值的偏差小于3%。采用LS-SVM模型对不同作用点下的多点支撑式压电测力仪灵敏度进行预测具有快速、可靠和高精度的特点，该方法用于定量分析复杂关系量是有效的。

为实现对压电式三维力传感器的高精度标定，在原标定模型上引入标定角度偏差因素。针对传感器转角、固定面不平与标定力源偏斜因素，开展了标定模型改进、参数获取与解耦效果分析等研究。分析传感器标定中存在的角度偏差，采用千分表与倾角仪进行测量。对未知参数过多问题，建立了合适的目标函数与约束条件，基于优化算法求解参数，实现了分离标定角度偏差的传感器标定。采用两种模型对实验数据解耦，从解耦误差均值和极值角度证明了新模型的有效性。结果表明：相比旧模型，实验数据下新模型大部分方向的解耦误差均值下降了80%左右，极值下降20%~49%。基于此分析了标定角度偏差对于传感器耦合特性的影响，得到各环节偏差引入的耦合比例，部分耦合系数中标定偏差因素占比达到70%以上。研究表明角度偏差对传感器标定的影响不可忽略，应加以控制。

针对传统图像处理算法在检测隐形眼镜表面缺陷时存在精度低、耗时长、算法鲁棒性差、漏检多等问题，提出一种基于改进Faster R-CNN的隐形眼镜表面缺陷检测算法。首先，对比了3种特征提取网络的性能，选取ResNet50作为骨干网络；然后，引入特征金字塔网络（FPN），通过融合多层次的特征信息，提高Faster R-CNN的多尺度检测能力；最后，基于构建的隐形眼镜表面缺陷数据集，使用K-means++算法改进锚框的尺度和数量。实验结果表明：改进后的Faster R-CNN算法在测试集上的平均精度均值（mAP）达到了86.95%，相比于改进前的Faster R-CNN算法，提高了9.45个百分点，可以有效地检测出气泡、车削亮点、划痕、模具亮点等多种隐形眼镜典型缺陷。

Interaction between photons and phonons in cavity optomechanical systems provides a new toolbox for quantum information technologies. A GaAs/AlAs pillar multi-optical mode microcavity optomechanical structure can obtain phonons with ultra-high frequency (~THz). However, the optical field cannot be effectively restricted when the diameter of the GaAs/AlAs pillar microcavity decreases below the diffraction limit of light. Here, we design a system that combines Ag nanocavity with GaAs/AlAs phononic superlattices, where phonons with the frequency of 4.2 THz can be confined in a pillar with ~4 nm diameter. The Q_c/V reaches 0.22 nm^?3, which is ~80 times that of the photonic crystal (PhC) nanobeam and ~100 times that of the hybrid point-defect PhC bowtie plasmonic nanocavity, where Q_c is optical quality factor and V is mode volume. The optomechanical single-photon coupling strength can reach 12 MHz, which is an order of magnitude larger than that of the PhC nanobeam. In addition, the mechanical zero-point fluctuation amplitude is 85 fm and the efficient mass is 0.27 zg, which is much smaller than the PhC nanobeam. The phononic superlattice-Ag nanocavity optomechanical devices hold great potential for applications in the field of integrated quantum optomechanics, quantum information, and terahertz-light transducer.

针对目前铜、金等金属材料加工的实际应用需求，开展了连续输出功率500 W的光纤耦合输出蓝光半导体激光加工光源研究。基于平面窗口TO封装的蓝光半导体激光单管器件，设计采用长后工作距的快轴准直镜和慢轴准直镜分别准直，获得低发散角、高光束质量的单元准直光束；结合二维空间合束、偏振合束和光纤耦合，将144个蓝光单管器件耦合进200 μm/NA 0.22光纤，通过ZEMAX软件对半导体激光光路进行光线追踪模拟；并从实验上实现，3 A电流驱动下，200 μm/NA 0.22光纤输出连续功率523 W，电光转换效率29 %。该激光光源具有直接加工铜、金等材料的能力。