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Standing Waves in a Cavity

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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: May 14, 2026

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Published on: February 25, 2017

Diffuse reflection inside a hexagonal nanocavity.

Nengwen Wang¹, Xiaodong Chen, Yuhua Yang

¹State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, School of Physics & Engineering, Sun Yat-sen University, Guangzhou, Guangdong, P R China.

Scientific Reports

|February 19, 2013

Summary

This summary is machine-generated.

Introducing nanoscale roughness to zinc oxide (ZnO) nanocavities alters light reflection. This wave diffuse reflection creates unique flowery luminescent patterns, moving beyond traditional whispering gallery modes for nanoscopic applications.

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Published on: August 22, 2017

Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Geometrical diffuse reflection describes light scattering from surfaces with micrometer-scale roughness, following Snell's law.
Understanding light-surface interactions at the nanoscale is crucial for advanced optical applications.

Purpose of the Study:

To investigate the optical behavior of light reflecting from surfaces with nanometer-scale roughness.
To explore the phenomenon of wave diffuse reflection in zinc oxide (ZnO) nanocavities.

Main Methods:

Introducing nanoscaled roughness onto the hexagonal faces of ZnO nanocavities.
Observing and analyzing the resulting luminescent profiles.

Main Results:

The introduction of nanoscaled roughness resulted in unique, flowery luminescent patterns.
These patterns replaced the conventional whispering gallery modes typically observed.
The observed phenomenon was attributed to wave diffuse reflection, distinct from geometrical diffuse reflection.

Conclusions:

Wave diffuse reflection occurs when surface features are comparable to the wavelength of light, leading to scattering.
This study demonstrates a novel optical effect in ZnO nanocavities with nanoscale roughness.
Findings have potential applications in nanoscale topography and uniform nanoscopic lighting.