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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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Nanowire Oligomer Waveguide Modes towards Reduced Lasing Threshold.

Henrik Mäntynen¹, Nicklas Anttu^1,2, Harri Lipsanen¹

¹Department of Electronics and Nanoengineering, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland.

Materials (Basel, Switzerland)

|December 8, 2020

Summary

Semiconductor nanowire oligomers show potential for lower-threshold nanolasers. Numerical simulations reveal that these arrangements can enhance modal properties, improving performance for chip-scale optoelectronics.

Keywords:

guided mode lasing threshold oligomer semiconductor nanowire waveguide

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Area of Science:

Optoelectronics
Nanophotonics
Semiconductor devices

Background:

Semiconductor nanowires are key components for nanolasers in chip-scale optoelectronics.
Vertical nanowires function as both gain media and Fabry-Pérot cavities.
Lasing threshold is influenced by modal confinement and end facet reflectivity, often limited by substrate refractive index contrast.

Purpose of the Study:

Investigate waveguide modes in vertical nanowire oligomers.
Compare modal properties of oligomers to single nanowire monomers.
Explore potential for reduced lasing thresholds in nanolasers.

Main Methods:

Numerical simulations to solve for oligomer waveguide eigenmodes.
Analysis of modal properties arising from interacting monomer modes.
Computation of mode reflectivity at nanowire end facets.

Main Results:

Nanowire oligomers exhibit modes with improved modal properties.
These modes can lead to a reduced lasing threshold compared to single nanowires.
Both nanowire and coating layer gain media were considered.

Conclusions:

Vertical nanowire oligomers offer a pathway to lower-threshold nanolasers.
Modal properties of oligomers can be engineered for enhanced performance.
Findings provide direction for future research in nanolaser development.