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Standing Waves in a Cavity01:28

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: Jun 25, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Microwave surface-plasmon-like modes on thin metamaterials.

Matthew J Lockyear1, Alastair P Hibbins, J Roy Sambles

  • 1School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, United Kingdom.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Researchers quantified surface-plasmon-like dispersion on thin metamaterial surfaces using microwave radiation. This finding extends previous work on perfect conductors, demonstrating the effect with sub-wavelength structures.

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Last Updated: Jun 25, 2026

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Area of Science:

  • Condensed Matter Physics
  • Metamaterials
  • Plasmonics

Background:

  • Perfect conductors can support surface-plasmon-like modes on structured surfaces with wavelength-scale thickness.
  • Previous research established the existence of these modes on bulkier structures.

Purpose of the Study:

  • To experimentally quantify the surface-plasmon-like dispersion.
  • To investigate these modes on metamaterial surfaces significantly thinner than the incident wavelength.

Main Methods:

  • Utilized microwave wavelength radiation.
  • Employed a wax prism setup with incident radiation beyond the critical angle.
  • Focused on metamaterial surfaces with sub-wavelength thickness.

Main Results:

  • Successfully quantified the surface-plasmon-like dispersion relation.
  • Demonstrated the existence of these modes on metamaterial surfaces much thinner than the wavelength.

Conclusions:

  • Metamaterial surfaces with sub-wavelength thickness can support surface-plasmon-like modes.
  • This work experimentally validates and extends the understanding of plasmon-like phenomena in reduced dimensions.