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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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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Open Transmission Channels in Multimode Fiber Cavities with Random Mode Mixing.

Guy Pelc¹, Shay Guterman¹, Rodrigo Gutiérrez-Cuevas²

¹The Hebrew University of Jerusalem, Racah Institute of Physics, Jerusalem 91904, Israel.

Physical Review Letters

|November 7, 2025

Summary

This summary is machine-generated.

Researchers explored open transmission channels in disordered media using a novel multimode fiber cavity (MMFC). This platform enabled precise control, achieving significant power enhancement and demonstrating high channel control for studying complex wave transport.

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Area of Science:

Wave physics
Optics
Condensed matter physics

Background:

Light transport in disordered media is often governed by open transmission channels.
These channels allow high power transmission despite low average transmission.
Experimental studies are challenging due to mode control and measurement difficulties.

Purpose of the Study:

To propose and validate a multimode fiber cavity (MMFC) as a platform for studying open transmission channels.
To achieve full control over open channels for experimental investigation.
To analyze the transmission properties and eigenvalue distributions within MMFCs.

Main Methods:

Utilizing a multimode fiber cavity (MMFC) to confine modes and control angular spread.
Selectively exciting an open channel within the MMFC.
Analyzing transmission matrices from multiple MMFC realizations.

Main Results:

Achieved an 18-fold power enhancement by exciting an open channel with high transmission (0.90±0.04).
Observed a bimodal transmission eigenvalue distribution, indicating effective channel control and low losses.
Demonstrated the scalability of MMFCs for complex wave transport studies.

Conclusions:

MMFCs provide a viable platform for exploring open transmission channels.
The platform offers high channel control, low losses, and potential for studying nonlinear phenomena.
MMFCs open new avenues for research in complex wave transport.