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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 13, 2026

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

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Broadband plasmonic half-wave plates in reflection.

Anders Pors¹, Michael G Nielsen, Sergey I Bozhevolnyi

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

|March 5, 2013

Summary

This summary is machine-generated.

Researchers designed novel reflective broadband half-wave plates using nanobricks. These plasmonic devices offer significant bandwidth and high reflectivity for near-infrared applications.

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Area of Science:

Plasmonics
Nanophotonics
Optical Metamaterials

Background:

Metal-insulator-metal (MIM) structures are fundamental in plasmonics.
Gap-surface plasmon resonances (GSPRs) enable unique optical properties.
Broadband wave plates are crucial for advanced optical systems.

Purpose of the Study:

To design and demonstrate metal-insulator-metal configurations as reflective broadband half-wave plates.
To investigate the role of periodic nanobricks in supporting GSPRs for wave plate functionality.
To achieve high reflectivity and broad bandwidth in the near-infrared (NIR) spectrum.

Main Methods:

Numerical simulations of MIM structures with periodic nanobricks.
Experimental fabrication and characterization of the proposed wave plate designs.
Analysis of optical properties including reflectivity and bandwidth.

Main Results:

Demonstrated that nanobrick-based MIM structures can function as reflective broadband half-wave plates.
Achieved a bandwidth of approximately 20% of the design wavelength in the NIR regime.
Theoretical reflectivity above 85% and experimental reflectivity of approximately 50% were measured.

Conclusions:

Periodic nanobricks in MIM configurations effectively support GSPRs for broadband half-wave plate applications.
The demonstrated wave plates exhibit promising scalability and bandwidth for NIR applications.
Further optimization is needed to enhance experimental reflectivity towards theoretical predictions.