介绍了有源光电子器件同轴和盒式封装结构、电学和光学零件的装联材料和光纤耦合系统的技术实现方法与可靠性。对比分析了电学零件装联材料和光学零件胶合材料的特性。阐述了光纤耦合系统中的直接耦合和间接耦合的结构特征，以及间接耦合中的光窗封接技术和直接耦合中的光纤与尾纤导管的三种封接技术和可靠性。此外，针对有源光电子器件的典型失效模式，给出了可靠性验证方法。

Since the discovery of topological insulators, topological phases have generated considerable attention across the physics community. The superlattices in particular offer a rich system with several degrees of freedom to explore a variety of topological characteristics and control the localization of states. Albeit their importance, characterizing topological invariants in superlattices consisting of a multi-band structure is challenging beyond the basic case of two-bands as in the Su–Schreifer–Heeger model. Here, we experimentally demonstrate the direct measurement of the topological character of chiral superlattices with broken inversion symmetry. Using a CMOS-compatible nanophotonic chip, we probe the state evolving in the system along the propagation direction using novel nanoscattering structures. We employ a two-waveguide bulk excitation scheme to the superlattice, enabling the identification of topological zero-energy modes through measuring the beam displacement. Our measurements reveal quantized beam displacement corresponding to 0.088 and -0.245, in the cases of trivial and nontrivial photonic superlattices, respectively, showing good agreement with the theoretical values of 0 and -0.25. Our results provide direct identification of the quantized topological numbers in superlattices using a single-shot approach, paving the way for direct measurements of topological invariants in complex photonic structures using tailored excitations with Wannier functions.

上转换纳米粒子(UCNPs)因其具有强生物穿透性、 大斯托克位移、 良好的光稳定性和生物相容性等优点而被广泛应用于生物医药分析领域。 通过聚丙烯酸(PAA)对油酸(OA)配体的上转换纳米粒子(OA-UCNPs)进行表面改性得到亲水性纳米粒子 PAA-UCNPs, 再通过酰胺化反应将适配体(Apt)共价偶联到PAA-UCNPs表面得到Apt-UCNPs并将其作为能量供体, 以黑洞猝灭剂(BHQ1)作为能量受体, 构建了一种基于荧光共振能量转移特异性检测磺胺二甲氧嘧啶(SDM)的方法。 通过红外光谱(FTIR)及扫描电镜(SEM)对OA-UCNPs、 PAA以及PAA-UCNPs的结构和性能进行了表征。 从红外光谱中可以看出, 相比较于OA-UCNPs, PAA-UCNPs于1 722 cm^-1处出现了新峰, 可能为PAA的-C=O伸缩振动峰, 且在3 400 cm^-1附近存在的宽带可能归因于PAA中O—H伸缩振动; 从扫描电镜实验结果可以看出, PAA修饰前分散在环己烷中的OA-UCNPs尺寸约为31 nm, 而PAA修饰后分散在水溶液中的UCNPs直径约为49 nm。 分析认为长链的PAA分子体积比油酸分子大, 因此包覆在UCNPs表面会使其尺寸增加, 以上结果均表明PAA可能已被修饰到UCNPs表面。 通过紫外可见光谱对Apt-UCNPs、 Apt及PAA-UCNPs的结构进行了表征。 结果发现相对于PAA-UCNPs, Apt-UCNPs的紫外吸收光谱在260 nm处出现了较明显的Apt特征吸收峰, 这表明适配体可能已被修饰到UCNPs表面。 对Apt-UCNPs用于检测SDM的机理进行了初步探讨, 结果发现Apt-UCNPs在540 nm的发射峰与BHQ1的吸收峰发生重叠, 表明Apt-UCNPs上的能量可通过共振能量转移效应转移到BHQ1使得Apt-UCNPs的荧光被猝灭。 对猝灭剂BHQ1的浓度进行了优化, 结果表明当BHQ1浓度为15 μmol·L^-1时, 荧光猝灭效率为55%。 在最佳实验条件下, 相对荧光强度与SDM浓度(150~1 000 ng·mL^-1)之间具有良好的线性关系, 选取与SDM 结构相似的磺胺吡啶和磺胺醋酰作对照实验, 发现尽管磺胺吡啶和磺胺醋酰的浓度达到了 500 ng·mL^-1, 但其检测体系中相较于加入SDM后的荧光强度恢复程度仍然较低, 这说明该检测方法可对SDM有特异性识别作用。

An ultrawideband, polarization-insensitive, metamaterial absorber for oblique angle of incidence is presented using characteristic mode analysis. The absorber consists of conductive meander square loops and symmetric bent metallic strips, which are embedded with lumped resistors. With the aid of modal currents and modal weighting coefficients, the positions of the lumped resistors are determined. After that, the equivalent circuit (EC) model and admittance formula are proposed and analyzed to further understand the working principle and ultrawide bandwidth. The proposed absorber measures an absorption bandwidth of 4.3–26.5 GHz (144.1% in fractional bandwidth) for 90% absorptivity under normal incidence. At the oblique angle of incidence of 45°, the bandwidth of 90% absorptivity is still 5.1–21.3 GHz (122.72%) for transverse electric (TE) polarization, and 6.8–29.5 GHz (125.07%) for transverse magnetic (TM) polarization. The good agreement among simulation, measurement, and EC calculation demonstrates the validity of the proposed method and indicates that the method can be applied to other microwave and optical frequency bands. The proposed metamaterial absorber can be widely applied in electromagnetic compatibility, electromagnetic interference, radar stealth, and biomedical detection.

大气偏振模式凭借具有太阳子午线信息的“∞”字形特征支撑偏振导航应用，然而由于采集装置的物理特性限制、采集地点的周边环境以及薄云等遮挡，导致获取的大气偏振信息部分失真，降低了太阳子午线的精度。为解决该问题，本文提出了基于邻域约束的大气偏振模式生成网络，该网络挖掘大气偏振模式分布的连续性，通过多步邻域特征推理以增加重构过程的约束，由局部有效偏振信息精准生成全局的大气偏振信息。此外，针对大气偏振模式的物理特性，提出了太阳子午线角度损失，进一步提升太阳子午线精度。本文在实测大气偏振数据上进行了实验，并与其它最新方法进行对比，实验结果证明了本文方法的鲁棒性和优越性。

Dynamic localization, which originates from the phenomena of particle evolution suppression under an externally applied AC electric field, has been simulated by suppressed light evolution in periodically curved photonic arrays. However, experimental studies on their quantitative dynamic transport properties and application for quantum information processing are rare. Here we fabricate one-dimensional and hexagonal two-dimensional arrays both with sinusoidal curvatures. We successfully observe the suppressed single-photon evolution patterns, and for the first time, to the best of our knowledge, measure the variances to study their transport properties. For one-dimensional arrays, the measured variances match both the analytical electric-field calculation and the quantum walk Hamiltonian engineering approach. For hexagonal arrays as anisotropic effective couplings in four directions are mutually dependent, the analytical approach suffers, whereas quantum walk conveniently incorporates all anisotropic coupling coefficients in the Hamiltonian and solves its exponential as a whole, yielding consistent variances with our experimental results. Furthermore, we implement a nearly complete localization to show that it can preserve both the initial injection and the wave packet after some evolution, acting as a memory of a flexible time scale in integrated photonics. We demonstrate a useful quantum simulation of dynamic localization for studying their anisotropic transport properties and a promising application of dynamic localization as a building block for quantum information processing in integrated photonics.

光信息在散射介质中传播时会发生散射现象，从而导致其强度和偏振信息发生变化。利用出射光的偏振状态可以间接表征散射介质的退偏特性，并对散射介质进行分类和识别。理论上穆勒矩阵( Mueller Matrix, MM)可以描述散射介质的全部偏振属性，对分析散射介质的退偏特性起到至关重要的作用，但是MM参数过多，较为复杂。然而，根据MM推导所得到的偏振纯度指数(Index of Polarization Purities，IPPs)结构简单，并可以更为直接的描述散射介质的退偏特性。IPPs由 ${P_1}$、 ${P_2}$、 ${P_3}$组成，代表退偏系统等效分解成的四个非退偏纯系统之间的权重差异。以 ${P_1}$、 ${P_2}$, ${P_3}$为坐标轴可构建出纯度空间，纯度空间中不同的点代表不同的退偏系统，利用纯度空间可以对不同的退偏系统进行分辨。相比较于传统偏振表征指标，IPPs可以表征散射介质及目标更多维度的信息。近年来，IPPs在生物医学和目标检测等诸多方面的研究取得了重要的研究成果。文章主要介绍了IPPs的理论，综述并讨论了其在分析不同分散体系的退偏特性、生物组织成像、医学监测和目标识别等方面的研究进展。