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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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Updated: Dec 10, 2025

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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Ultra-low-loss nanofiber Fabry-Perot cavities optimized for cavity quantum electrodynamics.

S K Ruddell, K E Webb, M Takahata

|September 2, 2020

Summary

We created ultra-low-loss fiber optic cavities for quantum technology. These high-finesse nanofiber cavities improve quantum network scalability and fidelity.

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Last Updated: Dec 10, 2025

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Area of Science:

Quantum optics
Nanophotonics
Fiber optics

Background:

Cavity quantum electrodynamics (CQED) requires high-quality optical cavities to enhance light-matter interactions.
All-fiber cavities offer robust and scalable platforms for quantum information processing.

Purpose of the Study:

To fabricate ultra-low-loss, all-fiber Fabry-Perot cavities with an integrated nanofiber section.
To optimize these cavities for cavity quantum electrodynamics (CQED) applications.
To assess the potential for scalable quantum networks.

Main Methods:

Fabrication of a nanofiber section between two fiber Bragg gratings.
Continuous monitoring of cavity finesse and fiber radius during fabrication.
Precise evaluation of taper transmission as a function of fiber radius.

Main Results:

Achieved ultra-low internal round-trip loss of 0.31% at a nanofiber waist radius of 207 nm.
Obtained a total cavity finesse of 1380.
Predicted a maximum internal cooperativity of ~1050 for a cesium atom on the nanofiber surface.

Conclusions:

Demonstrated a novel method for fabricating high-finesse nanofiber cavities.
The developed cavities show great promise for advancing cavity quantum electrodynamics.
This technology could enable the development of high-fidelity, scalable quantum networks.