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Related Experiment Video

Updated: Apr 9, 2026

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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Ultrafast Dynamics of Lasing Semiconductor Nanowires.

Robert Röder¹, Themistoklis P H Sidiropoulos², Christian Tessarek^3,4

¹†Institute of Solid State Physics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, 07743 Jena, Germany.

|June 19, 2015

Summary

This summary is machine-generated.

Ultrafast semiconductor nanowire lasers exhibit picosecond onset times, influenced by material properties and excitation wavelength. Pulse width depends on nanowire diameter, indicating a transition in waveguiding modes.

Keywords:

Semiconductor nanowire carrier thermalization carrier−phonon interaction onset time pulse width ultrafast lasing

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Semiconductor nanowire lasers are crucial for ultrafast optical applications.
Understanding their temporal dynamics, such as laser onset and pulse width, is essential for device optimization.

Purpose of the Study:

To investigate the temporal dynamics of semiconductor nanowire lasers, specifically laser onset time and pulse width.
To explore the influence of material properties, excitation wavelength, and nanowire dimensions on these dynamics.

Main Methods:

Employed a double-pump approach to measure temporal dynamics.
Studied wide bandgap materials: gallium nitride (GaN), zinc oxide (ZnO), and cadmium sulfide (CdS) nanowires.
Analyzed the effect of varying nanowire sizes and excitation wavelengths.

Main Results:

Laser onset times were found to be in the picosecond range, driven by carrier thermalization.
ZnO exhibited the fastest onset time (~1 ps) due to strong carrier-phonon coupling, followed by CdS (~2.5 ps) and GaN (~3.5 ps).
Onset times were independent of nanowire size but varied with excitation wavelength relative to the band gap.
Pulse widths depended on the optical system, with a critical diameter transition from ~5 ps to ~15 ps observed, linked to single-to-multimode waveguiding.

Conclusions:

Carrier thermalization dictates the picosecond laser onset in semiconductor nanowires.
Material-specific carrier-phonon coupling significantly impacts laser dynamics.
Nanowire diameter plays a critical role in pulse width by influencing waveguiding modes.