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Cleaved-coupled nanowire lasers.

Hanwei Gao¹, Anthony Fu, Sean C Andrews

¹Department of Chemistry, University of California, Berkeley, CA 94720, USA.

Proceedings of the National Academy of Sciences of the United States of America

|January 4, 2013

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Researchers developed the smallest cleaved-coupled cavities using gallium nitride (GaN) nanowires to achieve single-frequency UV lasing. This breakthrough offers lower threshold gain and controlled spectral modes for miniaturized optoelectronic devices.

Area of Science:

Optoelectronics
Nanotechnology
Materials Science

Background:

Miniaturization of optoelectronic devices is crucial for advancing photonic technologies.
Semiconductor nanowires are key nanoscale building blocks for photonic components.
Current nanowire lasers often exhibit multi-frequency emission due to Fabry-Pérot cavities.

Purpose of the Study:

To theoretically investigate and experimentally demonstrate spectral manipulation in nanowire lasers.
To create the smallest cleaved-coupled cavities for single-frequency emission.
To explore design principles for controlling lasing modes in nanowire lasers.

Main Methods:

Fabrication of cleaved-coupled cavities in gallium nitride (GaN) nanowires.
Theoretical investigation of optical coupling properties.

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Experimental demonstration of room-temperature UV lasing operation.

Main Results:

Achieved single-frequency UV lasing at room temperature using nanoscale gaps.
Demonstrated reduced lasing modes compared to individual nanowire lasers.
Observed lower threshold gain in cleaved-coupled nanowires.
Found good agreement between experimental spectra and theoretical predictions.

Conclusions:

Successfully created the smallest cleaved-coupled cavities to date for nanowire lasers.
The developed cavities enable spectral control and single-frequency emission.
The findings provide design principles for rationally controlling lasing modes in miniaturized nanowire lasers.