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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

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Light modulation with resonant grating-waveguide structures.

A Sharon, D Rosenblatt, A A Friesem

|November 3, 2009

Summary

This summary is machine-generated.

Semiconductor materials were used to create resonant grating-waveguide structures for light modulation. These structures demonstrated narrow spectral bandwidths and high intensity ratios, achieving modulation frequencies up to 5 MHz.

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Area of Science:

Photonics and Optoelectronics
Semiconductor Device Physics

Background:

Resonant grating-waveguide structures offer potential for optical modulation.
Indium Phosphide (InP) and Indium Gallium Arsenide Phosphide (InGaAsP) are key semiconductor materials for photonic applications.

Purpose of the Study:

To investigate the light modulation capabilities of InP/InGaAsP resonant grating-waveguide structures.
To characterize the spectral bandwidth and intensity modulation performance.

Main Methods:

Fabrication of resonant grating-waveguide structures using InP/InGaAsP materials.
Optical testing to measure resonant spectral bandwidth and intensity modulation ratios at a 1.55 micrometer wavelength.
Evaluation of modulation frequency performance.

Main Results:

Achieved narrow, subnanometer resonant spectral bandwidths.
Measured a high ratio of reflected intensities (greater than 50) between resonance and away from resonance.
Demonstrated modulation frequencies up to 5 MHz for a 3 mm x 3 mm structure.

Conclusions:

InP/InGaAsP resonant grating-waveguide structures are effective for high-performance light modulation.
The demonstrated characteristics are suitable for various photonic integrated circuit applications.
The structures show promise for high-speed optical signal processing.