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Hybrid Multilayered Plasmonic Nanostars for Coherent Random Lasing.

Battulga Munkhbat1, Johannes Ziegler1, Hannes Pöhl1

  • 1Institute of Applied Physics, and Linz Institute for Organic Solar Cells/Institute of Physical Chemistry, Johannes Kepler University Linz , 4040 Linz, Austria.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
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Summary

Hybrid multilayered plasmonic nanostars enable coherent random lasing in various solutions. Silver enhancement of gold nanostars significantly lowers the pumping threshold for this effect, offering a versatile platform for advanced laser applications.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • Coherent random lasing is a promising phenomenon for developing novel laser sources.
  • Plasmonic nanostructures offer unique optical properties for light manipulation.

Purpose of the Study:

  • To investigate the use of hybrid multilayered plasmonic nanostars as feedback agents for coherent random lasing.
  • To evaluate the effect of silver enhancement and silica coating on gold nanostars for random lasing applications.

Main Methods:

  • Fabrication of hybrid multilayered plasmonic nanostars.
  • Characterization of nanostar properties using spectroscopy.
  • Experimental demonstration of coherent random lasing in solutions with different gain materials (R6G dye, MEH-PPV polymer).
  • Systematic variation of nanostar coatings (silver enhancement, silica coating).

Main Results:

  • Hybrid multilayered plasmonic nanostars act as universal feedback agents for coherent random lasing in both polar and nonpolar solutions.
  • Silver enhancement of gold nanostars substantially reduces the pumping threshold for coherent random lasing.
  • Silica coating does not affect the lasing intensity or pumping threshold of silver-enhanced gold nanostar-based random lasers.
  • Silica-coated gold nanostars (without silver enhancement) only support amplified spontaneous emission, not coherent random lasing.

Conclusions:

  • Hybrid multilayered plasmonic nanostars provide a versatile platform for achieving coherent random lasing.
  • Silver enhancement is a key strategy for reducing the threshold and enhancing random lasing performance.
  • The role of silica coating is dependent on the presence of silver enhancement, highlighting the importance of material composition in nanostar-based photonic devices.