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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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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Diameter-dependent whispering gallery mode lasing effects in quantum dot micropillar cavities.

Imad Limame, Ching-Wen Shih, Aris Koulas-Simos

|November 22, 2024

Summary

Whispering gallery mode (WGM) microlasers show diameter-dependent lasing properties. Fabrication imperfections significantly impact performance, crucial for advancing nanophotonic applications.

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Area of Science:

Nanophotonics
Quantum Optics
Materials Science

Background:

Whispering gallery mode (WGM) microlasers are vital for nanophotonics, biosensing, and quantum information.
Quantum dot micropillar cavities offer unique platforms for studying WGM lasing phenomena.

Purpose of the Study:

To conduct a comprehensive diameter-dependent study of WGM lasing in quantum dot micropillar cavities.
To systematically investigate the impact of micropillar diameter on lasing properties.
To analyze the influence of fabrication imperfections on device performance.

Main Methods:

Experimental characterization of WGM lasing properties for micropillar diameters from 1 to 20 µm at cryogenic temperatures.
Utilizing rate equation fitting and finite element method (FEM) numerical simulations.
Incorporating realistic loss channels into the simulation models.

Main Results:

Observed strong, systematic dependence of lasing threshold, mode energy, quality factor, Purcell factor, and free spectral range on micropillar diameter.
Identified significant variations in lasing properties among nominally identical micropillars.
Demonstrated the critical role of growth and fabrication imperfections in device output.

Conclusions:

Micropillar diameter is a key parameter governing WGM microlaser performance.
Fabrication imperfections introduce variability, necessitating precise control for optimized optoelectronic devices.
This research provides essential insights for developing advanced nanophotonic applications.