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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:

Sound Waves: Resonance

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...

Modes of Standing Waves: II

Modes of Standing Waves: II

The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....

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Related Experiment Video

Updated: Aug 5, 2025

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

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Bloch Surface Waves in Open Fabry-Perot Microcavities.

Niccolò Marcucci¹, Tian-Long Guo², Ségolène Pélisset²

¹Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, 10129 Torino, Italy.

|March 29, 2023

Summary

This summary is machine-generated.

All-dielectric structures utilizing Bloch Surface Waves (BSWs) offer an alternative to plasmonics for integrated photonics. This study explores BSWs in microcavities for enhanced light confinement and strong coupling with WS2 excitons.

Keywords:

2D materials Bloch Surface Waves TMD strong coupling

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Area of Science:

Integrated photonics
Dielectric nanostructures
Light-matter interactions

Background:

All-dielectric structures are emerging for integrated photonics due to advanced thin-film deposition.
Bloch Surface Waves (BSWs) offer advantages over plasmonics, including reduced losses and easier manipulation.
Achieving subwavelength field confinement in dielectrics requires high-refractive index materials and patterning like photonic crystals or metasurfaces.

Purpose of the Study:

To computationally investigate the transverse localization of BSWs using quasi-flat Fabry-Perot microcavities.
To explore the hybridization of BSWs with excitons in 2D tungsten disulfide (WS2) materials.
To demonstrate strong coupling effects with both propagating and localized BSW modes.

Main Methods:

Computational study of BSWs in defected periodic dielectric multilayer corrugations.
Analysis of BSW dispersion and spatial distribution within microcavities.
Investigation of BSW hybridization with WS2 A excitons.

Main Results:

Demonstrated transverse localization of BSWs via quasi-flat Fabry-Perot microcavities.
Presented the dispersion and spatial distribution of BSW cavity modes.
Observed strong coupling between BSWs (propagating and localized) and WS2 excitons.

Conclusions:

Quasi-flat Fabry-Perot microcavities enable effective transverse localization of BSWs in all-dielectric structures.
Hybridization with WS2 excitons leads to strong coupling, extending beyond propagating BSWs to localized modes.
These findings highlight the potential of dielectric BSWs for advanced photonic applications.