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Related Concept Videos

Standing Waves in a Cavity01:28

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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Related Experiment Video

Updated: May 16, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Deep subwavelength plasmonic whispering-gallery-mode cavity.

Soon-Hong Kwon1

  • 1Department of Physics, Chung-Ang University, Seoul 156-756, South Korea. soonhong.kwon@gmail.com

Optics Express
|November 29, 2012
PubMed
Summary

Researchers developed a tiny plasmonic whispering-gallery-mode cavity for light confinement. This nanodevice achieves deep subwavelength mode volumes and high quality factors, enhancing light-matter interactions for potential photonic applications.

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Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

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Last Updated: May 16, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Area of Science:

  • Photonics and Nanotechnology
  • Plasmonics
  • Optical Cavities

Background:

  • Whispering-gallery-mode (WGM) cavities offer enhanced light confinement.
  • Plasmonic structures enable subwavelength light manipulation.
  • Achieving deep subwavelength confinement in WGM cavities is challenging.

Purpose of the Study:

  • To propose and investigate a plasmonic WGM cavity for deep subwavelength light confinement.
  • To achieve a resonant wavelength of 1550 nm.
  • To optimize cavity dimensions for high quality factors and Purcell factors.

Main Methods:

  • Fabrication of a dielectric disk sandwiched by silver disks.
  • Investigating resonant wavelength dependencies on cavity radius and thickness.
  • Numerical simulations to determine mode volume and quality factor.

Main Results:

  • A plasmonic WGM cavity with radius 88 nm and thickness 10 nm was designed.
  • The cavity confines surface-plasmon-polariton modes at 1550 nm.
  • Achieved a deep subwavelength mode volume of 0.010 (λ/2n)(3) and a quality factor of 1900 at 40K.
  • Resulting in a large Purcell factor of 1.1 x 10^5.

Conclusions:

  • The proposed plasmonic WGM cavity demonstrates effective deep subwavelength light confinement.
  • The optimized cavity design offers a high Purcell factor, beneficial for quantum optics and sensing.
  • This work paves the way for miniaturized, high-performance plasmonic devices.