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Single-mode surface plasmon distributed feedback lasers
Elham Karami Keshmarzi1, R Niall Tait, Pierre Berini
1Dept. of Electronics, Carleton University, 1125 Colonel By Dr, Ottawa, ON, Canada.
Nanoscale
|March 15, 2018
Summary
Researchers developed single-mode surface plasmon distributed feedback (DFB) lasers using a novel structure. These lasers exhibit narrow linewidths and TM polarization, suitable for various applications.
Area of Science:
- Plasmonics and Photonics
- Optoelectronics
- Materials Science
Background:
- Surface plasmon polaritons (SPPs) offer unique light-matter interaction properties.
- Distributed feedback (DFB) lasers provide narrow linewidth emission.
- Integrating SPPs with DFB structures can lead to novel laser functionalities.
Purpose of the Study:
- To realize single-mode surface plasmon distributed feedback (DFB) lasers in the near-infrared region.
- To investigate the performance characteristics of these novel DFB lasers.
- To assess their potential for integration and application as coherent surface plasmon sources.
Main Methods:
- Fabrication of a two-dimensional non-uniform long-range surface plasmon polariton structure.
- Excitation of surface plasmon modes on silver (Ag) or gold (Au) metal stripes acting as Bragg gratings.
- Optical pumping of an IR-140 doped PMMA layer for optical gain.
Main Results:
- Achieved single-mode lasing peaks with very narrow linewidths near 882 nm at room temperature for both Ag and Au DFBs.
- Observed exclusively TM-polarized lasing emission.
- Identified threshold pump power densities and predicted very narrow Schawlow-Townes linewidths.
Conclusions:
- Successfully demonstrated single-mode surface plasmon DFB lasers with excellent coherence.
- The narrow linewidths are attributed to low spontaneous emission and high DFB quality factors.
- These lasers are promising as cost-effective, recyclable, and highly coherent sources for plasmonic applications and integration.
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