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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: Aug 12, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Published on: December 27, 2012

Paper-folding-based terahertz anti-resonant cavity.

Jiayu Zhao, Jiaao Yan, Yongpeng Han

|February 1, 2023

Summary

Researchers developed a novel origami-based terahertz (THz) Fabry-Perot cavity using paper. This tunable structure enables programmable adjustments for pressure sensing and polarization conversion applications.

Area of Science:

Optics and Photonics
Metamaterials
Terahertz (THz) Technology

Background:

Core-anti-resonant reflection (CARR) cavities offer expanded material and morphology choices.
Fabry-Perot (F-P) cavities traditionally have limitations in material flexibility.
Paper, an unconventional material, has demonstrated potential as a precision resonator in the THz band.

Purpose of the Study:

To integrate origami functionality with CARR cavities for programmable distance adjustment.
To explore the application of origami-enhanced CARR cavities in sensing and polarization conversion.
To demonstrate a new degree of freedom for tuning resonant frequencies and cavity properties.

Main Methods:

Fabrication of an octagonal paper tube cavity incorporating origami patterns.

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Programmable adjustment of the distance between parallel cavity surfaces using origami.

Characterization of the cavity's performance in pressure sensing and THz polarization conversion.

Main Results:

Achieved programmable control over the cavity distance, enabling frequency tuning.
Demonstrated high-sensitivity pressure sensing with a sensitivity of 57.9 kPa⁻¹.
Successfully utilized the origami cavity as a THz polarization converter, modulating linear to circular polarization states.

Conclusions:

The combination of CARR cavities and origami provides a flexible platform for tunable THz devices.
Origami-enhanced CARR cavities show promise for advanced applications like sensitive pressure sensors and polarization converters.
Future work can explore 4D or soft-magneto origami materials for multi-responsive CARR cavities.