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

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Cavity-free plasmonic nanolasing enabled by dispersionless stopped light.

Tim Pickering¹, Joachim M Hamm¹, A Freddie Page¹

¹The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, Prince Consort Road, London SW7 2AZ, UK.

Nature Communications

|September 18, 2014

Summary

Researchers achieved nanolasing without a cavity by stopping light in nanoplasmonic structures. This breakthrough utilizes a unique feedback mechanism for ultra-thin lasers and cavity-free quantum plasmonics.

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Last Updated: Apr 23, 2026

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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Published on: September 5, 2017

Area of Science:

Photonics and Plasmonics
Laser Physics
Nanotechnology

Background:

Light interaction with gain media intensifies at stopped-light conditions due to optical state density singularity.
Stopped light provides intrinsic, cavity-free feedback, analogous to random lasers.

Purpose of the Study:

Investigate spatial, temporal, and spectral characteristics of lasing in nanoplasmonic structures.
Demonstrate cavity-free nanolasing enabled by stopped-light feedback.
Explore the formation and robustness of subwavelength lasing modes.

Main Methods:

Utilized planar gain-enhanced nanoplasmonic structures.
Analyzed lasing signatures at near-infrared frequencies.
Studied the dynamic formation of phase-locked waveguide modes.

Main Results:

Achieved nanolasing without an optical cavity.
Identified a feedback mechanism inherent to stopped light.
Revealed subwavelength lasing modes form as phase-locked superpositions of dispersion-free waveguide modes.
Demonstrated robustness against interface roughness.

Conclusions:

Stopped-light feedback enables cavity-free nanolasing in plasmonic structures.
This mechanism offers a novel pathway for developing ultra-thin surface-emitting lasers.
Paves the way for advancements in cavity-free active quantum plasmonics.