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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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Directing random lasing emission using cavity exciton-polaritons.

Paul Bouteyre, Hai Son Nguyen, Jean-Sébastien Lauret

|December 31, 2020

Summary

Researchers achieved directional random lasing by coupling a hybrid perovskite random laser with a microcavity polaritonic resonance. This breakthrough allows tunable emission angles for various applications.

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Area of Science:

Optics and Photonics
Materials Science
Condensed Matter Physics

Background:

Random lasing utilizes light scattering in disordered media for feedback, enabling lasing action.
Unlike conventional lasers, random lasers typically exhibit omnidirectional emission due to scattering.
Directional emission is crucial for most practical laser applications.

Purpose of the Study:

To achieve directional emission from a random lasing system.
To explore the coupling of random lasing with cavity polaritonic resonances.
To tune the emission angles of directional random lasing.

Main Methods:

Fabrication of a vertical microcavity incorporating the hybrid perovskite CH3NH3PbBr3.
Coupling the emission of the random laser with a cavity polaritonic resonance.
Systematic variation of cavity detuning to control emission directionality.

Main Results:

Demonstrated directional random lasing by integrating a hybrid perovskite random laser with a microcavity.
Achieved tunable emission angles, reaching up to 15.8° and 22.4°.
Successfully controlled emission directionality by adjusting cavity detuning.

Conclusions:

The coupling of random lasing with cavity polaritons offers a viable route to directional emission.
Tunable directional random lasing is achievable in hybrid perovskite microcavities.
This work paves the way for new applications requiring controlled light emission from disordered gain media.