对像元尺寸为10 μm的1280×1024碲镉汞（HgCdTe）中波红外焦平面阵列的制备技术和性能进行了研究。通过B⁺注入制备小尺寸n-on-p平面结；采用高平整度HgCdTe外延材料和高精度的倒焊互连技术，实现高的电学连通率；采用多段温度填胶固化和边缘刻蚀工艺减轻HgCdTe器件和读出集成电路（ROICs）之间的热失配，从而降低焦平面器件失效率。在85 K焦平面工作温度下，研制探测器的光谱响应范围为3.67 μm至4.88 μm，有效像元率高达99.95%，并且探测器组件像元的平均噪声等效温差（NETD）和暗电流密度的平均值分别小于16 mK和2.1×10^-8A/cm²。与像元尺寸为15 μm的探测器相比，10 μm的1280×1024中波红外探测器可获取更加精细的图像，具有更远的识别距离。目前，该技术已成功转移到浙江珏芯微电子有限公司（ZJM）的HgCdTe红外探测器产线。

Manipulating and real-time monitoring of neuronal activities with cell-type specificity and precise spatiotemporal resolution during animal behavior are fundamental technologies for exploring the functional connectivity, information transmission, and physiological functions of neural circuits in vivo. However, current techniques for optogenetic stimulation and neuronal activity recording mostly operate independently. Here, we report an all-fiber-transmission photometry system for simultaneous optogenetic manipulation and multi-color recording of neuronal activities and the neurotransmitter release in a freely moving animal. We have designed and manufactured a wavelength-independent multi-branch fiber bundle to enable simultaneous optogenetic manipulation and multi-color recording at different wavelengths. Further, we combine a laser of narrow linewidth with the lock-in amplification method to suppress the optogenetic stimulation-induced artifacts and channel crosstalk. We show that the collection efficiency of our system outperforms a traditional epi-fluorescence system. Further, we demonstrate successful recording of dynamic dopamine (DA) responses to unexpected rewards in the nucleus accumbens (NAc) in a freely moving mouse. We also show simultaneous dual-color recording of neuronal Ca²⁺ signals and DA dynamics in the NAc upon delivering an unexpected reward and the simultaneous optogenetic activating at dopaminergic terminals in the same location. Thus, our multi-function fiber photometry system provides a compatible, efficient, and flexible solution for neuroscientists to study neural circuits and neurological diseases.Manipulating and real-time monitoring of neuronal activities with cell-type specificity and precise spatiotemporal resolution during animal behavior are fundamental technologies for exploring the functional connectivity, information transmission, and physiological functions of neural circuits in vivo. However, current techniques for optogenetic stimulation and neuronal activity recording mostly operate independently. Here, we report an all-fiber-transmission photometry system for simultaneous optogenetic manipulation and multi-color recording of neuronal activities and the neurotransmitter release in a freely moving animal. We have designed and manufactured a wavelength-independent multi-branch fiber bundle to enable simultaneous optogenetic manipulation and multi-color recording at different wavelengths. Further, we combine a laser of narrow linewidth with the lock-in amplification method to suppress the optogenetic stimulation-induced artifacts and channel crosstalk. We show that the collection efficiency of our system outperforms a traditional epi-fluorescence system. Further, we demonstrate successful recording of dynamic dopamine (DA) responses to unexpected rewards in the nucleus accumbens (NAc) in a freely moving mouse. We also show simultaneous dual-color recording of neuronal Ca²⁺ signals and DA dynamics in the NAc upon delivering an unexpected reward and the simultaneous optogenetic activating at dopaminergic terminals in the same location. Thus, our multi-function fiber photometry system provides a compatible, efficient, and flexible solution for neuroscientists to study neural circuits and neurological diseases.

Three-dimensional (3D) imaging radar is an advanced sensor applied in space surveillance and target recognition for supplying 3D geometric features and supporting visualization. However, high 3D resolution requires both broadband operation and a large 2D aperture, which are difficult and complex for conventional radars. This paper presents a photonics-enabled distributed multiple-input and multiple-output (MIMO) radar with a centralized architecture. By use of photonic multi-dimensional multiplexing, multi-channel signal generation and reception are implemented on a shared reference signal in a central office, enabling a highly coherent network with a simple structure. Additionally, a sparse array and a synthetic aperture are combined to efficiently reduce the required transceivers, further weakening the dilemma between system complexity and angular resolution. A 4×4 MIMO radar is established and evaluated in field tests. A high-resolution 3D image of a non-cooperative aircraft is obtained, in which rich details are displayed. From a comparison with electronics-based radar, significant resolution improvement is observed. The results verify the superior imaging capability and practicability of the proposed radar and its great potential to outperform conventional technologies in target classification and recognition applications.

为了实现对隐藏在散射介质后方的静态目标物体的高分辨率重构以及动态目标物体的重构和实时追踪，避免利用旋转毛玻璃产生赝热光源的不可预置性和机械振动对成像质量的影响，将空间光调制器应用到散斑相关成像系统中来产生赝热光场，对静态目标成像以及动态目标追踪进行了实验研究。其中动态目标追踪的偏差率在很小的范围内，最小可达0.38%。在图像重构过程中，采用基于扫描近似信息传递的相位恢复算法来提高运算速度和图像鲁棒性。对比了基于相位和振幅两种调制方式产生的赝热光源质量和图像重构质量，实验结果表明，基于相位调制产生的赝热光源质量更好，对应的重构图像分辨率更佳。