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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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Tunable localization of light using nested invisible metasurface cavities.

Francisco S Cuesta¹, Sergei Kosulnikov¹, Viktar S Asadchy¹

¹Department of Electronics and Nanoengineering, Aalto University, P.O. Box 15500, FI-00076, Aalto, Finland.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

Nested invisible cavities offer a novel method for controlling localized fields. Their unique scatter-less property allows for tunable quality factors and stronger field confinement, particularly in optical applications.

Keywords:

cavity field localization metasurface quality factor tunable

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Area of Science:

Optics and Photonics
Metamaterials
Electromagnetism

Background:

Invisible cavities are open resonant devices that confine fields without external scattering.
Nesting invisible cavities leverages their scatter-less nature for unique interactions.
Controlling localized fields and quality factors is crucial in various optical systems.

Purpose of the Study:

To investigate the properties of nested invisible cavities.
To demonstrate a simple method for achieving stronger localized fields.
To explore tunable quality factors in such nested systems.

Main Methods:

Theoretical analysis of nested invisible cavity properties.
Numerical simulations of field confinement and scattering.
Implementation using nanodisk-based dielectric metasurfaces operating at electric resonances.

Main Results:

Nested invisible cavities enable precise control over localized fields through relative positioning.
Demonstrated stronger field localization compared to single cavities.
Achieved high and tunable quality factors by adjusting cavity nesting.

Conclusions:

Nested invisible cavities provide an effective strategy for enhancing and tuning optical fields.
Dielectric metasurfaces offer a practical platform for realizing these optical cavities.
This approach opens new avenues for advanced optical device design.