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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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Related Experiment Video

Updated: Dec 14, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Light-controllable metasurface for microwave wavefront manipulation.

Lei Chen, Qian Fan Nie, Ying Ruan

|July 17, 2020

Summary

This summary is machine-generated.

This study introduces an optically coded metasurface that uses light to control microwave scattering for beam deflection. This innovative approach links optical information with microwave fields for advanced electromagnetic wave modulation.

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Published on: December 27, 2012

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Last Updated: Dec 14, 2025

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Published on: June 7, 2019

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Area of Science:

Metamaterials and Nanophotonics
Electromagnetic Wave Manipulation
Optoelectronics

Background:

Controlling electromagnetic waves with physical fields is a significant research area.
Integrating optical control with microwave scattering offers novel functionalities.

Purpose of the Study:

To develop an optically coded metasurface for beam deflection via anomalous reflection.
To establish a connection between optical information and microwave fields.

Main Methods:

Combining light control with microwave scattering using PIN-diode-loaded unit cells.
Employing photoresistors and voltage-driven modules to modulate element states based on light intensity.
Reprogramming digital element arrangements by modulating light signals.

Main Results:

Demonstrated light-induced switching of digital element states ('0' or '1') with high sensitivity.
Achieved reprogrammable scattering fields by modulating light signals.
Validated the design's feasibility through simulations and experiments.

Conclusions:

The proposed optically coded metasurface effectively steers electromagnetic waves using light.
This light-steering approach provides a new dimension for electromagnetic wave modulation.
The integration of optical and microwave fields opens avenues for advanced optoelectronic devices.