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相关概念视频

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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相关实验视频

Updated: Sep 11, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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高性能传输类型的元表面,用于产生特拉赫兹聚焦旋束.

Yanglu Xuan, Chang Liu, Qiushi Li

    Optics express
    |August 13, 2025
    PubMed
    概括

    研究人员开发了一种新的Pancharatnam-Berry (PB) 超表面,用于在太赫兹范围内产生高效的聚焦束 (FVB). 这一突破为先进应用提供了紧而高效的光学设备.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 超材料是指一种超材料.
    • 特拉赫兹技术的技术.

    背景情况:

    • 传统的聚焦旋转束 (FVB) 发电机很庞大,很难集成.
    • 在FVB发电中实现高效率和纯度存在挑战.

    研究的目的:

    • 提出并演示一种新的传输类型的Pancharatnam-Berry (PB) 超表面,用于生成太赫兹FVB.
    • 为了实现高聚焦效率和纯度,使用全介电元原子.

    主要方法:

    • 一个两层柱元表面的设计,表现出对立对称的Fabry-Perot共振.
    • 在柱上刻有结构的元表面的制造.
    • 在太赫兹频率的FVB生成效率和纯度的实验性表征.
    • 复杂设备的数值模拟,如FVB衍射器和双焦元表面.

    主要成果:

    • 实验展示了近乎完美的聚焦的太赫兹旋转束,具有高聚焦效率 (91.0%) 和纯度 (93.9%).
    • 对于相撞光束来说,实现了相反的圆极化.
    • 数字模拟证实了FVB衍射器 (94.4%的效率,92.5%的纯度) 和双焦元表面 (92.8%的效率,92.1%的纯度) 的良好性能.

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    Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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    Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

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    相关实验视频

    Last Updated: Sep 11, 2025

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    High-speed Particle Image Velocimetry Near Surfaces
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    High-speed Particle Image Velocimetry Near Surfaces

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    Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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    结论:

    • 拟议的PB元表面能够高效地产生太赫兹FVB.
    • 这项技术为开发紧,集成光学设备提供了一条途径.
    • 潜在的应用包括粒子操纵,信息处理和光学计量学.