Author Affiliations
Abstract
1 Nanjing University of Posts and Telecommunications, Institute of Advanced Materials and Institute of Flexible Electronics (Future Technology), State Key Laboratory of Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors, Nanjing, China
2 Nanjing University of Posts and Telecommunications, College of Electronic and Optical Engineering and Microelectronics and College of Flexible Electronics (Future Technology), Jiangsu Province Engineering Research Center for Fabrication and Application of Special Optical Fiber Materials and Devices, Nanjing, China
Materials that exhibit visible luminescence upon X-ray irradiation show great potential in the medical and industrial fields. Pure organic materials have recently emerged as promising scintillators for X-ray detection and radiography, due to their diversified design, low cost, and facile preparation. However, recent progress in efficient radioluminescence has mainly focused on small molecules, which are inevitably associated with processability and repeatability issues. Here, a concise strategy is proposed to prepare radioluminescent polymers that exhibit multiple emission colors from blue to yellow with high brightness in an amorphous state by the radical copolymerization of negatively charged polyacrylic acid and different positively charged quaternary phosphonium salts. One of the obtained polymers exhibits excellent photostability under a high X-ray irradiation dosage of 27.35 Gy and has a detection limit of 149 nGy s - 1. This performance is superior to that of conventional anthracene-based scintillators. Furthermore, by simply drop-casting a polymer methanol solution on a quartz plate, a transparent scintillator screen was successfully fabricated for X-ray imaging with a resolution of 8.7 line pairs mm - 1. The pure organic phosphorescent polymers with a highly efficient radioluminescence were demonstrated for the first time, and the strategy reported herein offers a promising pathway to expand the application range of amorphous organic scintillators.
organic scintillator radioluminescence room temperature phosphorescence X-ray imaging copolymer Advanced Photonics
2022, 4(3): 035002
1 中国科学院微电子研究所, 北京 100029
2 中国科学院大学, 北京 100049
3 华进半导体封装先导技术研发中心有限公司, 江苏 无锡 214135
四级脉冲幅度调制(PAM4)在高速串行链路系统中的地位日益提高, 受到越来越多的关注。传统的行波马赫-曾德尔调制器(TWMZM)的分光比为1∶1, 文章提出了一种非对称光强的行波马赫-曾德尔调制器(Asymmetric Power TWMZM, AP-TWMZM), 并对输入端分光比进行独立推算, 得到分光比的值为4∶1。Lumerical软件的建模仿真结果表明, 在插入损耗和消光比与TWMZM相当的情况下, AP-TWMZM具有更高的调制效率和更好的线性度, 其线性度高达0.948。
行波调制器 分光比 调制效率 线性度 链路 traveling wave modulator spectral ratio modulation efficiency linearity link
Author Affiliations
Abstract
1 System Packaging and Integration Research Center, Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China
2 University of Chinese Academy of Sciences, Beijing 100059, China
3 National Center for Advanced Packaging, Wuxi 214028, China
A dual-lens-integrated distributed feedback (DFB) laser based on hybrid integration for single-mode transmitter optical subassembly (TOSAs) is discussed in this paper. The alignment and fixing of the lenses are simple to manipulate and highly accurate, making it possible to achieve high-efficient optical coupling to single-mode fiber (SMF) without additional high-precision tools and fixing equipment. The capability for a low coupling loss of less than 3 dB between the laser and fiber was demonstrated. The fabricated TOSA module has clear opening eyes with minor time jitters at a bit rate of 25 Gbit/s. This hybrid integration is a low fabrication cost, compact, and low insertion loss method to manufacture TOSA for a 200 or 400 GbE optical transceiver in a high-speed optical network.
光电子快报（英文版）
2021, 17(7): 395
李志雄 1,2何慧敏 1,2,3,*刘丰满 1,2,3薛海韵 1,2,3[ ... ]曹立强 1,2,3
1 中国科学院微电子研究所, 北京 100029
2 中国科学院大学, 北京 100049
3 华进半导体封装先导技术研发中心有限公司, 江苏 无锡 214135
光电收发模块作为光通信系统中的两个核心模块, 承载着电信号转化为光信号与光信号转化为电信号的核心功能, 其性能对整个通信质量起着决定性作用。文章提出一种改进型的高速率、低功耗和低成本4通道25 Gbit/s光电互连收发模块的封装设计, 在传统的以驱动芯片和调制器为基础作为发端和以探测器和跨阻放大器为基础作为收端的同时, 增加时钟数据恢复电路, 优化封装结构, 通过抑制链路抖动和减小阻抗失配引起的反射来提高通道带宽。优化后收发模块的背靠背眼图测试结果显示, 在25 Gbit/s速率下, 系统的误码率在1E-13以下, 且收发模块的总功率仅为3.9 W。
光通信 光发送模块 光接收模块 印制电路板 眼图 optical communication optical transmission module optical receiving module printed circuit board eye diagram
大连理工大学 辽宁省微纳米及系统重点实验室, 辽宁 大连 116024
基于微流控芯片的细胞培养能有效模拟细胞在体生存微环境, 为实现微流控芯片内细胞的长期动态培养及实时观察, 设计并制作了一种微流控芯片细胞动态培养装置。首先,采用分体式设计, 利用SolidWorks分别构建培养箱、控制箱和载泵箱的三维模型, 根据性能要求设计控制系统并配备硬件。接着, 利用Comsol软件中的焦耳热模块对加热器ITO玻璃进行热力学仿真, 通过分析温度场验证可行性。然后, 搭建培养装置, 进行调试, 并检验其稳定性。最后, 进行细胞培养实验。采用分体式设计可有效减小培养箱体积, 实现与显微观测系统的兼容; 培养装置对温湿度的控制稳定性良好; 细胞生长状态良好, 生长曲线呈“S”形, 细胞存活率达到95%以上。该分体式微流控细胞动态培养装置可长期为细胞培养提供所需环境, 并可进行实时观察, 满足设计要求。
动态培养 分体式 温湿度控制 稳定性 dynamic culture split-body type temperature and humidity control stability
1 大连理工大学 辽宁省微纳米及系统重点实验室, 辽宁 大连 116024
2 厦门大学 机电工程系, 福建 厦门 361005
细胞培养是进行细胞研究的基础, 为了在细胞体外培养时提供一种近似于体内的微环境, 设计了一种可供细胞三维动态培养的微器件。首先设计了用于输运流体的微通道网络, 培养池对称布置于微通道网络中, 通过一系列“多进多出”型微通道分别与进样口和出样口相连。利用Comsol软件中的层流物理场和多孔介质物理场耦合对培养池内的流场进行仿真, 通过比较流场的均一性和稳定性优化微通道网络结构。然后, 采用静电直写技术在培养池内集成聚己内酯(PCL)三维支架, 构建细胞三维培养空间。最后, 封合微器件, 检测微器件培养池内的流体流动情况, 并进行细胞实验。实验结果表明, “2×2”型微器件培养池内的流体稳定性和均一性较好; PCL三维支架的纤维间距400 μm, 纤维直径80 μm, 孔隙率64%, 细胞存活率达到90%以上。该细胞三维动态培养微器件更好地模拟了生物体内细胞生存所需的微环境, 培养池内的细胞生长良好, 满足设计要求。
微器件 微流控 三维动态培养 多孔介质 静电直写 三维支架 micro-devices microfluidics three-dimensional dynamic culture porous media electrohydrodynamic direct-writing three-dimensional scaffolds
Author Affiliations
Abstract
1 School of Mechanical and Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
2 Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing University of Aeronautics and Astronautics (NUAA), Nanjing 210016, China
3 e-mail: pans@nuaa.edu.cn
We propose and demonstrate an agile X-band signal synthesizer with ultralow phase noise based on all-fiber-photonic techniques for radar applications. It shows phase noise of () at 10 kHz (100 kHz) offset frequency for 10 GHz carrier frequency with integrated RMS timing jitter between 7.6 and 9.1 fs (integration bandwidth: 10 Hz–10 MHz) for frequencies from 9 to 11 GHz. Its frequency switching time is evaluated to be 135 ns with a 135 pHz frequency tuning resolution. In addition, the X-band linear-frequency-modulated signal generated by the proposed synthesizer shows a good pulse compression ratio approximating the theoretical value. In addition to the ultrastable X-band signals, the proposed synthesizer can also provide 0–1 GHz ultralow-jitter clocks for analog-to-digital converters (ADC) and digital-to-analog converters (DAC) in radar systems and ultralow-jitter optical pulse trains for photonic ADC in photonic radar systems. The proposed X-band synthesizer shows great performance in phase stability, switching speed, and modulation capability with robustness and potential low cost, which is enabled by an all-fiber-photonics platform and can be a compelling technology suitable for future X-band radars.
Mode-locked lasers Microwaves Radar Fiber optics Ultrafast technology Photonics Research
2018, 6(1): 01000012
1 重庆理工大学光电信息学院, 重庆 400054
2 四川理工学院理学院, 四川 自贡 643000
针对光子晶体研究领域的重点、难点问题, 分析了单色电磁波在周期性电介质中传播的偏微分方程和激光全息记录法实现光子晶体模板的理论基础。借助全息光栅理论, 设计了三维光子晶体的晶格结构, 用双光束三次曝光法制作了红光632.8 nm的三维面心立方光子晶体模板, 探讨了影响光子晶体模板成品质量的对比度、旋转精度控制、折射率改变等问题的解决思路。在制作过程中使用双光束三次曝光法, 排除了对记录光束偏振方向的调整, 达到了在制作大面积光子晶体模板中简化系统光路, 稳定系统性能的目的。
光子晶体 激光全息技术 模板 三维晶格结构
