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相关概念视频

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...

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相关实验视频

Updated: Jun 27, 2026

Optical Trapping of Nanoparticles
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Optical Trapping of Nanoparticles

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在双极相变纳米粒子上的方向可切换横向光学扭矩.

Ping Ding, Menglong Lu, Liangchen Lu

    Optics letters
    |October 1, 2024
    PubMed
    概括

    一个相变纳米粒子可以在特定的光照条件下将光学扭矩 (OT) 从正向负转换. 这种可逆的横向OT现象非常强大,为纳米技术的实际应用铺平了道路.

    科学领域:

    • 纳米技术纳米技术
    • 光学是什么?光学是什么?光学是什么?
    • 材料科学 材料科学 材料科学

    背景情况:

    • 对纳米粒子进行光学扭矩 (OT) 操纵对于先进的应用至关重要.
    • 换相材料提供可调节的光学特性.
    • 了解复杂纳米结构中的光物质相互作用是必不可少的.

    研究的目的:

    • 研究相变纳米粒子从正向负光学扭矩的过渡.
    • 分析不同材料阶段光学扭矩生成的基本机制.
    • 评估观察到的现象的稳定性和实际适用性.

    主要方法:

    • 利用多极扩张理论用于分析表达式.
    • 模拟光物质相互作用与两个循环极化平面波.
    • 在绝缘和金属阶段分析电磁反应.

    主要成果:

    • 观察到从正向负光学扭矩的过渡.
    • 金属相中的正OT归因于电响应.
    • 绝缘阶段的负OT是由磁反应和磁双极相互作用引起的.
    • 可逆横向OT证明了对发生平面波之间的角度的稳定性.

    更多相关视频

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    High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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    Fabrication and Operation of a Nano-Optical Conveyor Belt
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    结论:

    • 这项研究证明了相变纳米粒子中的新型光学扭矩切换机制.
    • 这些发现突出了利用定制光学场对纳米粒子进行受控操纵的潜力.
    • 这种现象的强度表明,在光学捕捉和纳米机器人领域有实际应用.