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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: Jun 19, 2026

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Published on: January 26, 2016

Cavity ring-down ellipsometry.

Anna Karaiskou¹, Vassilis Papadakis, Benoit Loppinet

¹Department of Chemistry, University of Crete, 71003 Voutes-Heraklion, Greece.

The Journal of Chemical Physics

|October 2, 2009

Summary

This summary is machine-generated.

This study enhances ellipsometric measurements using an optical cavity for increased sensitivity. This technique allows for the study of fast surface phenomena with unprecedented time resolution.

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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

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Area of Science:

Surface science
Optical physics
Analytical chemistry

Background:

Ellipsometry is a powerful technique for characterizing thin films and surfaces.
Current ellipsometers have limitations in sensitivity and time resolution for studying dynamic surface processes.

Purpose of the Study:

To demonstrate enhanced ellipsometric measurements using multiple reflections within an optical cavity.
To achieve high phase shift sensitivity and submicrosecond time resolution for surface analysis.

Main Methods:

Utilizing a highly reflective target surface and an optical cavity to amplify polarized light reflections.
Measuring the adsorbed amount of molecular vapor (fenchone) onto ring-cavity mirrors to validate the principle.

Main Results:

Achieved a phase shift sensitivity of approximately 10(-2) degrees in a single 1-microsecond laser pulse.
Demonstrated the potential for sensitivities of at least 10(-4) degrees with further improvements.

Conclusions:

The developed method significantly enhances ellipsometric sensitivity and time resolution compared to commercial instruments.
This technique opens new possibilities for studying fast surface phenomena with high precision.