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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:

Parallel Resonance

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Updated: Jun 22, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Whispering-gallery mode micro-kylix resonators.

Mher Ghulinyan¹, Alessandro Pitanti, Georg Pucker

¹Advanced Photonics & Photovoltaics, Fondazione Bruno Kessler - irst, via Sommarive 18, Povo, Trento, Italy. ghulinyan@fbk.eu

|May 26, 2009

Summary

Researchers developed micro-kylix resonators to tune optical properties. These novel devices achieve significant wavelength shifts with minimal diameter changes, improving quality factors (Q-factors) for photonics applications.

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Published on: April 4, 2016

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Last Updated: Jun 22, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Area of Science:

Photonics
Optical Engineering
Materials Science

Background:

Micro-disk, ring, and toroid resonators confine electromagnetic energy in small dielectric volumes.
Loss channels limit spectral windows (Q-bands) and degrade Q-factors in conventional micro-resonators.

Purpose of the Study:

To introduce a new class of micro-resonators, named micro-kylix resonators, for tuning Q-bands.
To demonstrate enhanced Q-factors and efficient wavelength tuning via engineered stress in micro-resonators.

Main Methods:

Engineered stress in a flat disk to create concave or convex micro-kylix resonators.
Investigated the interplay between material absorption and radiative loss-related Q-factors through geometric modification.

Main Results:

Achieved significant Q-band tuning (60 nm) with a 0.4% diameter modification in micro-kylix resonators.
Demonstrated two orders of magnitude higher Q-factors compared to flat micro-disks with similar tuning.
Observed geometry-induced interplay between material absorption and radiative losses.

Conclusions:

Micro-kylix resonators offer a novel strategy for tuning Q-bands and enhancing Q-factors.
These devices provide new functionalities and technological solutions for photonics and micro-resonator physics.
Engineered stress in micro-resonators is a promising approach for advanced optical applications.