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Phase Contrast and Differential Interference Contrast Microscopy01:26

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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...
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基于液晶弹性体的衍射光学元件的光驱动相变.

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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 材料科学 材料科学 材料科学
    • 纳米技术纳米技术

    背景情况:

    • 衍射光学元件 (DOE) 对于微型化和集成光学系统至关重要,在光束成形和成像中找到应用.
    • 现有的DOE在很大程度上是静态的,这限制了它们在动态光学系统中的适应性和功能.

    研究的目的:

    • 为了引入一种新的可调节的衍射光学元件.
    • 为了证明基于光的光学元件在可见光谱中的衍射光学元件属性的控制.
    • 探索光控制软平台的潜力,用于先进的光子设备.

    主要方法:

    • 在可变形液晶弹性体基板上制造一个衍射光学元件,其中包括一个金色微阵列.
    • 使用532nm激光器进行光学送,以诱导液晶弹性体基板的受控变形.
    • 分析由基板变形引起的远场衍射模式的变化.

    主要成果:

    • 展示了一种可调节的衍射光学元件,其衍射模式可以通过可见光改变.
    • 观察到液晶弹性体基质晶格中的光诱导的变化.
    • 证实基板变形直接改变远场衍射特征.

    结论:

    • 开发的设备代表了可调调衍射光学的重大进步.
    • 控制光的软平台显示出创造动态和可重新配置的光子设备的希望.
    • 潜在的应用包括可调节过器,合器,全息图和结构色彩显示器.