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相关概念视频

Angular Momentum: Single Particle01:10

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Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
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A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
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3D Orbital Tracking in a Modified Two-photon Microscope: An Application to the Tracking of Intracellular Vesicles
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采用光斑驱动的单射轨道角动量识别,采样密度超低.

Zhiyuan Wang1,2,3, Haoran Li1,2,3, Tianting Zhong4,5

  • 1Huaqiao University, College of Information Science and Engineering, Xiamen, China.

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|December 12, 2025
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概括

我们开发了一种新的方法,空间复杂点检测 (SMPD),用于在光中识别轨道角动量 (OAM). 该技术使用散射介质有效编码信息,以最小的数据点实现高精度.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 信息处理 信息处理

背景情况:

  • 轨道角动量 (OAM) 识别对于光通信和量子技术至关重要.
  • 传统方法在散射介质 (例如多模纤维) 中失败,需要高分辨率传感器.

研究的目的:

  • 引入一种新的,高效的OAM识别技术,对散射介质具有稳定性.
  • 减少对高分辨率传感器和复杂数据采集的依赖.

主要方法:

  • 开发了空间多重点检测 (SMPD),这是一个光斑驱动的OAM识别技术.
  • 利用散射介质作为内在编码器,通过从斑点平面中的几个空间分布点中提取强度.
  • 与传统成像相比,显著减少了采样要求.

主要成果:

  • 仅使用16个采样点 (采样密度为0.024%) 实现了OAM识别的检索准确度超过99%.
  • 通过空间时间交叉的束解码,高容量OAM多重化通信和机器学习任务 (MNIST,时尚-MNIST) 展示了多功能性.

结论:

  • SMPD将从障碍物中的散射转化为有效的编码机制.
  • 建立一个可扩展的战略,用于复杂环境中的光学信息处理和基于光纤的传感.