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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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Related Experiment Video

Updated: Apr 14, 2026

$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Cavity ring-up spectroscopy for ultrafast sensing with optical microresonators.

Serge Rosenblum¹, Yulia Lovsky¹, Lior Arazi¹

¹Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel.

Nature Communications

|April 16, 2015

Summary

We developed cavity ring-up spectroscopy, a nanosecond-timescale technique for analyzing microresonators. This faster method enables the study of rapid dynamic processes in various scientific fields.

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Last Updated: Apr 14, 2026

$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Implementation of a Reference Interferometer for Nanodetection

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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Published on: December 15, 2021

Area of Science:

Optics and Photonics
Spectroscopy
Nanotechnology

Background:

Whispering-gallery mode microresonators are valuable for detecting single particles.
Current spectroscopic methods are limited to millisecond timescales.

Purpose of the Study:

To introduce a significantly faster spectroscopic technique.
To enable the study of ultrafast dynamics in microresonators.

Main Methods:

Development of cavity ring-up spectroscopy using detuned probe pulses.
Achieving nanosecond timescale spectral snapshots.
Utilizing heterodyne measurements for high sensitivity.

Main Results:

Demonstrated spectral capture at 16 ns intervals.
Monitored submicrosecond dynamics of microtoroid resonators.
Observed optomechanical vibrations, thermorefractive response, and Kerr nonlinearity.

Conclusions:

Cavity ring-up spectroscopy offers unprecedented temporal resolution.
This technique can advance research in fast biological processes and quantum optics.
It opens new avenues for studying dynamic phenomena in micro- and nanostructures.