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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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Lasing Action from Quasi-Propagating Modes.

Max J H Tan¹, Jeong-Eun Park¹, Francisco Freire-Fernández¹

¹Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA.

Advanced Materials (Deerfield Beach, Fla.)

|June 23, 2022

Summary

This summary is machine-generated.

Quasi-propagating modes in nanoparticle lattices enable continuous-wavelength lasing. This breakthrough in optical metamaterials paves the way for advanced applications in sensing and communication.

Keywords:

2D plasmonic lattices multibeam lasers multicolor lasers perovskite nanocrystals quasi-propagating modes

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Area of Science:

Optics and Photonics
Materials Science
Condensed Matter Physics

Background:

Band edges at high symmetry points in periodic structures are crucial for materials engineering due to their high density of states.
In optical metamaterials, standing waves at these points have enabled phenomena like lasing and Bose-Einstein condensation.
Localized properties at high symmetry points limit applications to specific energies and wavevectors.

Purpose of the Study:

To demonstrate lasing action over a continuous range of wavelengths and directions using quasi-propagating modes in 2D nanoparticle lattices.
To explore the potential of quasi-propagating modes for applications requiring tunable and multi-directional light emission.

Main Methods:

Utilized lead halide perovskite nanocrystal films as gain materials in 2D nanoparticle lattices.
Investigated waveguide-surface lattice resonance (W-SLR) modes, decomposing them into propagating and standing wave components.
Employed an analytical 3D model to analyze the characteristics of diffracted light and lasing beams.

Main Results:

Achieved lasing action from quasi-propagating modes in 2D nanoparticle lattices over a continuous spectrum of wavelengths and directions.
Demonstrated tunable lasing across different wavelengths and lattice designs.
Confirmed the role of W-SLR modes in providing optical feedback for lasing.

Conclusions:

Quasi-propagating modes in nanoparticle lattices offer a pathway to engineer chromatic multibeam emission.
This approach overcomes the limitations of localized high symmetry points, enabling broader applications.
Potential applications include hyperspectral 3D sensing, high-bandwidth Li-Fi communication, and advanced laser projection displays.