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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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Mode selection in electrically driven quantum dot microring cavities.

Alexander Schlehahn¹, Ferdinand Albert, Christian Schneider

¹Technische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.

|July 12, 2013

Summary

This summary is machine-generated.

Researchers developed a novel method to select specific lasing modes in microcavities using sub-wavelength notches. This technique controls light scattering, enabling precise tuning of whispering gallery mode (WGM) spectra for optical applications.

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Area of Science:

Photonics and Optical Engineering
Materials Science
Quantum Dot Technology

Background:

Whispering gallery mode (WGM) resonators are crucial for various photonic applications.
Precise control over the WGM spectrum in microcavities remains a challenge.
Electrically pumped quantum dot microcavities offer potential for integrated light sources.

Purpose of the Study:

To present a novel method for selecting specific lasing modes in whispering gallery mode (WGM) microcavities.
To demonstrate the use of sub-wavelength notches for mode control.
To explore the tunability of WGM spectra through notch geometry.

Main Methods:

Fabrication of ring-shaped quantum dot microcavities with diameters of 80 µm and ridge widths below 2 µm.
Introduction of sub-wavelength notches (approx. 50 nm width, 500 nm depth) onto the sidewalls of the microcavities.
Analysis of the effect of notches as scattering centers on the WGM spectrum.

Main Results:

The introduced notches effectively act as scattering centers.
Modes with intensity maxima at the notch positions are suppressed.
The angle and placement of notches allow for controlled selection of lasing modes.
Repetitive patterns of lasing and suppressed modes can be achieved by varying notch angles.

Conclusions:

Sub-wavelength notches provide an effective method for selecting lasing modes in WGM microcavities.
This technique offers a new pathway for tailoring the spectral output of quantum dot microcavities.
The ability to control mode suppression and selection opens possibilities for advanced optical device design.