Intelligent food packaging with the multisensory analysis is promising as the next generation technology of food packaging. The oxygen content in food packaging is one of the crucial parameters affecting the food quality and shelf life. Caviar is among the most nutritious and costly food sources. Here, a photonic oxygen-sensing system, based on the time-resolved phosphorescence spectroscopy of a platinum complex, is developed for non-contact, non-intrusive, and real-time vacuum packaging quality control, and implemented for caviar packaging. The sensor is embedded in protective polyethylene layers and excited with a short-pulsed light emitting diode (LED) source. Integration of a blue pulsed light source, a fast and amplified silicon photodiode controlled by the Spartan-6 field programmable gate array (FPGA), and a long lifetime platinum complex results in a photonics-based oxygen sensor with a fast response and high sensitivity to the vacuum packaging damage, which is suitable for caviar. It is revealed that applying the polyethylene layers protects the caviar from the platinum complex, leaching while not interfering with the sensor functionality. Characterizing the photonic system based on its sensitivity, repeatability, stability, and long-term operation demonstrates its capability for this application.

荧光寿命显微成像（FLIM）已经广泛应用于生命科学研究领域，具有高灵敏和高特异性的特点，在对组织微环境进行定量表征方面具有独特优势，但由于成像速度相对较慢，限制了FLIM的活体应用。近年来，随着光电子器件和人工智能等技术的发展，开启了FLIM活体成像新篇章。介绍通过优化硬件和算法两方面提升时域和频域FLIM技术的成像速度，以及其在生物医学基础研究和临床疾病诊断中的应用研究进展。最后，对活体FLIM成像的未来发展进行展望。

Fluorescence imaging in the second near-infrared window (NIR-II, 900–1880nm) with less scattering background in biological tissues has been combined with the confocal microscopic system for achieving deep in vivo imaging with high spatial resolution. However, the traditional NIR-II fluorescence confocal microscope with separate excitation focus and detection pinhole makes it possess low confocal efficiency, as well as difficultly to adjust. Two types of upgraded NIR-II fluorescence confocal microscopes, sharing the same pinhole by excitation and emission focus, leading to higher confocal efficiency, are built in this work. One type is fiber-pinhole-based confocal microscope applicable to CW laser excitation. It is constructed for fluorescence intensity imaging with large depth, high stabilization and low cost, which could replace multiphoton fluorescence microscopy in some applications (e.g., cerebrovascular and hepatocellular imaging). The other type is air-pinhole-based confocal microscope applicable to femtosecond (fs) laser excitation. It can be employed not only for NIR-II fluorescence intensity imaging, but also for multi-channel fluorescence lifetime imaging to recognize different structures with similar fluorescence spectrum. Moreover, it can be facilely combined with multiphoton fluorescence microscopy. A single fs pulsed laser is utilized to achieve up-conversion (visible multiphoton fluorescence) and down-conversion (NIR-II one-photon fluorescence) excitation simultaneously, extending imaging spectral channels, and thus facilitates multi-structure and multi-functional observation.

自2001年被发明以来，超导纳米线单光子探测器（SNSPD）迅速成长为近红外波段的明星光子探测器，其在近红外波段如1550 nm处系统探测效率超过95%，暗计数率低于1 cps（counts per second），时间抖动优于10 ps，探测速率高于1 GHz，并广泛应用在量子信息领域。近年来，研究人员开始将SNSPD引入到生物领域，以替代在近红外波段具有低信噪比、多后脉冲的半导体单光子探测器。本文将介绍SNSPD的探测原理和性能指标，并系统地阐述SNSPD在生物领域中的应用现状和发展前景。

近年来, 三维荧光技术已经成为常用的化学分析技术, 但有些结构相近的荧光有机物的三维荧光光谱十分相似, 可能导致分析结果错误。 因此, 如何精准区分具有相似三维荧光光谱的有机物是十分重要且亟待解决的问题。 荧光量子产率和荧光寿命是荧光有机物两个重要的光学参数, 对于分子结构的差异更灵敏。 对吲哚、 3-甲基吲哚和L-色氨酸的三维荧光光谱、 荧光量子产率和荧光寿命进行了研究。 结果表明, 它们的三维荧光光谱都出现两个荧光峰, 且荧光峰位置十分接近。 吲哚和L-色氨酸的荧光峰大致位于［激发波长, 发射波长］=［275, 340～350］和［220, 340～350］ nm附近, 3-甲基吲哚的荧光峰位于［激发波长, 发射波长］=［280, 365］和［225, 365］ nm附近。 在相同浓度下, 三种有机物在激发波长为275～280 nm处的最高荧光强度依次为: 吲哚>3-甲基吲哚>L-色氨酸。 利用绝对量子产率测量技术测得吲哚、 3-甲基吲哚和L-色氨酸的荧光量子产率分别约为0.264、 0.347和0.145; 利用时间相关单光子计数技术测得吲哚、 3-甲基吲哚和L-色氨酸的荧光寿命分别约为4.149、 7.896和2.715 ns。 研究表明, 荧光寿命和荧光量子产率能区分三维荧光光谱相似的荧光有机物, 研究结果在荧光有机物的准确识别上具有重要的价值。

在测试中波碲镉汞光伏器件的瞬态响应时，当激光光斑照射器件表面位置距离光敏面较远时，器件表现为特殊的双峰脉冲响应现象，分析表明出现这种异常双脉冲现象的原因是光敏区内的少子漂移和光敏区外侧向收集的少子扩散有时间上的差异。通过对器件施加反向偏压，脉冲响应随反向偏压的增大由双峰变成单峰的实验结果，验证了少子侧向收集是导致器件形成双峰的主要原因。对第二个峰拟合得到p区的少数载流子寿命。将瞬态响应获得的少子寿命与该p型中波碲镉汞材料的理论计算和光电导衰退法得到的少子寿命相对比，发现三种方式得到的少子寿命随温度的变化趋势基本一致，这说明了可以通过瞬态光响应得到中波碲镉汞器件的少子寿命。

在87Rb冷原子系综中通过自发拉曼散射过程产生原子自旋波与光子的关联, 利用偏振干涉仪将与磁敏感自旋波关联的Stokes光子的两个空间模式编码为一个偏振量子比特, 产生磁敏感自旋波与光子的纠缠源。采用近共线装置和精确补偿地磁场, 纠缠源的寿命达到900s, Bell参量S=2.58±0.03。