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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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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Broadband surface plasmon wave excitation using dispersion engineering.

Michael Chasnitsky, Michael Golosovsky, Dan Davidov

|December 25, 2015

Summary

This study demonstrates broadband surface plasmon resonance (SPR) excitation, enabling sensitive spectroscopic sensing. This advanced technique allows for precise monitoring of dynamic processes like thin liquid film growth.

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Area of Science:

Plasmonics
Optical Sensors
Surface Science

Background:

Surface-plasmon-based sensors offer high sensitivity due to the resonance phenomenon.
This resonance is governed by the phase-matching condition between surface plasmon waves and incident light.

Purpose of the Study:

To demonstrate simultaneous phase-matching for multiple wavelengths, enabling broadband surface plasmon resonance (SPR).
To explore methods for exciting broadband SPR and its application in sensitive spectroscopic sensing.

Main Methods:

Numerical and experimental validation of broadband SPR.
Excitation via interface patterning and broadband coupling with dispersion compensation.
Demonstration at the gold-water or gold-air interface.

Main Results:

Achieved SPR excitation across the entire near-infrared range (1 μm to 3 μm).
Confirmed SPR extends over a broad wavelength range.
Showcased broadband SPR for sensitive spectroscopic sensing.

Conclusions:

Broadband SPR can be excited using interface patterning or dispersion compensation.
This broad excitation enables sensitive spectroscopic sensing applications.
Effective for monitoring dynamic processes like wetting and dewetting in thin liquid films.