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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:

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Updated: May 28, 2026

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

Published on: March 23, 2017

Continuous layer gap plasmon resonators.

Michael G Nielsen¹, Dmitri K Gramotnev, Anders Pors

¹Institute of Technology and Innovation (ITI), University of Southern Denmark, Niels Bohrs Allé 1, DK-5230 Odense M, Denmark. mgni@iti.sdu.dk

|October 15, 2011

Summary

This summary is machine-generated.

We developed a gold nanostrip resonator for gap surface plasmons. This plasmonic device shows strong light absorption and high intensity enhancement, making it ideal for sensing and photovoltaics.

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Area of Science:

Plasmonics
Optical Metamaterials
Nanophotonics

Background:

Surface plasmons are collective oscillations of electrons at a metal-dielectric interface.
Plasmonic resonators are crucial for enhancing light-matter interactions.
Fabry-Perot resonators offer tunable optical properties.

Purpose of the Study:

To theoretically and experimentally demonstrate a novel Fabry-Perot resonator for gap surface plasmons.
To investigate the resonant characteristics and performance of gold nanostrip arrays.
To explore the potential applications of this plasmonic configuration.

Main Methods:

Theoretical modeling of plasmonic resonances.
Experimental fabrication of gold nanostrip arrays on silicon dioxide films.
Optical characterization using near-infrared spectroscopy.
Two-photon luminescence microscopy for intensity enhancement measurements.

Main Results:

Demonstrated an efficient Fabry-Perot resonator for gap surface plasmons using gold nanostrips.
Observed strong, narrow resonances with nearly complete absorption in the near-infrared.
Achieved quality factors of ~15-20.
Measured intensity enhancement factors of ~120 at ~770 nm resonance wavelength.

Conclusions:

The gold nanostrip configuration provides excellent resonant characteristics.
Resonance wavelength is tunable by adjusting nanostrip width and dielectric film thickness.
The simple fabrication process makes this plasmonic system attractive for sensing and photovoltaics.