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相关概念视频

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Overview of Electron Microscopy01:25

Overview of Electron Microscopy

The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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 keV in...
Calculation of Electric Flux01:25

Calculation of Electric Flux

Consider the electric field of an oppositely charged, parallel-plate system and an imaginary box between those plates. Let the bottom face of the box be ABCD, and the top face be FGHK. The electric field between the plates is uniform and points from the positive plate toward the negative plate. The calculation of this field's flux through the box's various faces shows that the net flux through the box is zero. Why does the flux cancel out here?
Gauss's Law01:07

Gauss's Law

If a closed surface does not have any charge inside where an electric field line can terminate, then the electric field line entering the surface at one point must necessarily exit at some other point of the surface. Therefore, if a closed surface does not have any charges inside the enclosed volume, then the electric flux through the surface is zero. What happens to the electric flux if there are some charges inside the enclosed volume? Gauss's law gives a quantitative answer to this question.
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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相关实验视频

Updated: Jun 17, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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光学元表面用于生成和操纵光学束.

Hammad Ahmed1, Hongyoon Kim2, Yuebian Zhang3

  • 1School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH144AS, UK.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
概括

光学超表面使带有轨道角动量 (OAM) 的光学 vortices (OVs) 的微型生成和操纵成为可能. 这一突破为先进的光学应用和消费电子产品提供了一个灵活,低成本的平台.

关键词:
在OAM中采用全息.在OAM的多重复合中,OAM的多重复合在OAM分类中进行OAM分类在OAM上叠加.非线性元面是指非线性元面.光学元面是光学元面的表面.

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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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相关实验视频

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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科学领域:

  • 光子学和光学 在光子学和光学.
  • 超材料是什么?超材料是什么?
  • 光学角运动量 光学角运动量

背景情况:

  • 带有轨道角动量 (OAM) 的光学 (OV) 提供了独特的信息传输能力.
  • 传统的OV生成方法是庞大,昂贵,缺乏设计灵活性.
  • 光学元表面提供了对光特性的亚波长控制.

研究的目的:

  • 审查使用光学元表面生成和操纵OV的最新进展.
  • 讨论OV的各种光学操纵技术,包括叠加,排序,复杂化和全息.
  • 为未来光学技术突出基于高层表面的OV的潜力.

主要方法:

  • 对OVs的光学metasurface应用现有文献的审查.
  • 讨论OAM叠加,排序,复杂化和全息的超表面设计.
  • 探索非线性元表面,以提高OAM生成和控制.

主要成果:

  • 光学超表面为超薄,灵活和具有成本效益的OV设备提供了一条途径.
  • 已证明的功能包括OAM叠加,排序,复杂化和全息应用.
  • 非线性超表面显示出先进OAM操纵的前景.

结论:

  • 基于metasurface的OV代表了光学操纵的重大进步.
  • 这些技术将推动消费电子和便携式光学系统的进步.
  • 微型OAM系统的开发对于未来的应用至关重要.