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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: Mar 16, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Manipulation of wavefront using helical metamaterials.

Zhenyu Yang, Zhaokun Wang, Huan Tao

|August 10, 2016

Summary

Helical metamaterials efficiently control light wavefronts by inducing phase shifts. Their performance, independent of wavelength, is directly linked to the helix angle, enabling applications like anomalous refraction.

Area of Science:

* Metamaterials Science
* Optics and Photonics
* Nanotechnology

Background:

* Helical metamaterials exhibit strong coupling effects due to their 3D structure.
* They are promising for efficient phase shift generation and wavefront control.

Purpose of the Study:

* To investigate the phase shift properties of helical metamaterials.
* To explore their potential for controlling light propagation.

Main Methods:

* Finite-difference time-domain (FDTD) simulations.
* Jones calculus for theoretical explanation.

Main Results:

* Phase shifts observed for both transmitted and reflected light.
* Maximum reflection coefficients exceeded 60%.

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Characterization of Anisotropic Leaky Mode Modulators for Holovideo

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Related Experiment Videos

Last Updated: Mar 16, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

Characterization of Anisotropic Leaky Mode Modulators for Holovideo

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* Dispersionless phase shift (φ) observed between 600-860 nm, following φ = ± 2θ, dependent only on initial helix angle (θ).

* Anomalous refraction demonstrated using an array of helices with a constant phase gradient.

Conclusions:

* Helical metamaterials offer efficient and tunable wavefront control.
* The dispersionless phase shift property simplifies device design.
* Demonstrated anomalous refraction highlights potential for novel optical devices.