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Microcavity effects and optically pumped lasing in single conjugated polymer nanowires
Deirdre O'Carroll1, Ingo Lieberwirth, Gareth Redmond
1Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland.
Nature Nanotechnology
|July 26, 2008
Summary
Researchers achieved optically pumped lasing in single conjugated polymer nanowires. These nanowires act as optical cavities, enabling single-mode laser action for advanced photonics.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Conjugated polymers offer tuneable optoelectronic properties and ease of processing for photonics.
- Various resonator geometries exist for conjugated polymer lasers, but one-dimensional nanowires are a new frontier.
- Nanowires are promising for integrated, subwavelength photonic devices.
Purpose of the Study:
- To report the first observation of optically pumped lasing in single conjugated polymer nanowires.
- To characterize the waveguide and resonator properties of these nanowires.
- To demonstrate single-mode laser action in these nanostructures.
Main Methods:
- Fabrication of single conjugated polymer nanowires.
- Optical pumping experiments at room temperature.
- Far-field optical characterization of emission spectra and waveguide properties.
Main Results:
- Demonstrated optically pumped lasing in individual conjugated polymer nanowires.
- Identified nanowire end faces as optically flat, enabling cylindrical optical cavity formation.
- Observed axial Fabry-Pérot mode structure and single-mode excitonic laser action above a pump energy threshold.
Conclusions:
- Single conjugated polymer nanowires can function as efficient laser cavities.
- These nanowires exhibit single-mode laser action, paving the way for subwavelength photonic devices.
- The findings represent a significant step towards integrated, miniaturized laser sources.
