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Standing Waves in a Cavity

Standing Waves in a Cavity

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:

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Updated: Jun 3, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

无线微波到光学转换通过无直流供应的可编程元表面.

Xin Ge Zhang¹, Ya Lun Sun¹, Bingcheng Zhu²

¹State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing, China.

Nature communications

|January 9, 2025

概括

研究人员开发了一种可编程的超表面,用于直接将微波转换为激光,从而实现无线,无电池通信. 这项技术支持在空气-水接口上双向数据传输.

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Last Updated: Jun 3, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

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Published on: September 25, 2020

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科学领域:

经典科学和量子科学是两种科学.
光电学是指光电子产品.
超材料是指一种超材料.

背景情况:

微波到光学转换对于通信,传感和成像至关重要.
使用光纤和电路方法的现有方法具有局限性,需要多个步骤和外部电源.
需要有效,直接和多功能的微波到光学转换技术.

研究的目的:

提出并演示可编程的超表面,用于直接的,高速的,自由空间的微波-激光转换.
在没有外部电源的情况下实现双向微波光学转换.
探索这种技术在跨媒体通信系统中的应用.

主要方法:

将低波长微波共振结构,MS连接和光电PN连接组件集成到可编程的元表面中.
开发一个全双重无线通信系统,利用地表转换器进行空气-水数据传输.
通过空气-水界跨越双向实时数据传输的实验验证.

主要成果:

成功演示了直接的,高速的自由空间微波到激光的转换.
实现了双向转换能力,使反向操作成为可能.
建立了一个全双重无线通信系统,用于实时的空气-水数据交换.
在没有直流电源的情况下运行超表面转换器.

结论:

可编程的超表面为高效的微波光学相互转换提供了一个新的解决方案.
这项技术使无线和无电池接口能够实现跨媒体通信.
展示的空气-水通信系统突出了地表转换器的实际潜力.