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相关概念视频

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

932
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
932

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Double-parameter analysis of an asymmetric herringbone temperature and refractive index sensor based on all-dielectric metasurface.

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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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一个单位可编程的多功能元表面,用于微波束成形.

Wu Zhang1, Jiahan Lin1, Zitao Zheng1

  • 1School of Physics and Material Science, Guangzhou University, Guangzhou 510006, China.

Micromachines
|November 25, 2023
PubMed
概括

这项研究介绍了一种可编程的超表面,能够进行微波束成型. 这种1位编码的设备为成像,传输和传感中的应用提供了灵活的控制.

关键词:
metasurface 地表的表面是什么可以编程的可编程程序.可以调节的焦点.旋光束的生成过程

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相关实验视频

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科学领域:

  • 电磁学 电磁学 电磁学 电磁学
  • 材料科学 材料科学 材料科学

背景情况:

  • 超表面提供了对电磁波的先进控制.
  • 可编程的超表面对于动态束形应用至关重要.

研究的目的:

  • 为了演示一个多功能,可编程的超表面用于微波束成型.
  • 为了实现对微波束的灵活控制,使用1位编码的元表面.

主要方法:

  • 超表面包括一组可编程单元细胞,每个单元都有一个Varactor二极管.
  • 通过控制变频器二极管的电偏移,在6.2 GHz实现0到π相位移,从而实现1位编码.
  • 试验证明光束生成,包括单焦,双焦和聚焦的束.

主要成果:

  • 1位编码的超表面成功生成了单聚焦,双聚焦和聚焦的束.
  • 可调节的焦距 (54毫米,103毫米,152毫米) 经过实验,在5.7GHz的单焦束中实现了.
  • 超表面表现出强大而灵活的束形状能力.

结论:

  • 开发的可编程超表面为先进的微波应用提供了一个多功能平台.
  • 它灵活的光束成型能力适合微波成像,信息传输和传感.