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Plasmonically controlled lasing resonance with metallic-dielectric core-shell nanoparticles.

Xiangeng Meng1, Koji Fujita, Shunsuke Murai

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Tailoring lasing resonance properties was achieved by coupling surface plasmons and photons in core-shell nanoparticles. This method enhances coherent feedback, crucial for advanced optical devices.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Laser Physics

Background:

  • Random lasing relies on optical feedback mechanisms.
  • Metallic nanoparticles are commonly used in plasmonic applications.
  • Controlling lasing properties is essential for device optimization.

Purpose of the Study:

  • To demonstrate tailoring of lasing resonance properties.
  • To investigate the role of surface plasmon-photon coupling in random lasing.
  • To explore the use of metallic-dielectric core-shell nanoparticles in random lasing media.

Main Methods:

  • Experimental demonstration of random lasing.
  • Fabrication of metallic-dielectric core-shell nanoparticles.
  • Characterization of optical feedback and pump threshold.
  • Analysis of surface plasmon-photon coupling.

Main Results:

  • Core-shell nanoparticles offer distinct optical feedback compared to pure metallic nanoparticles.
  • Increased shell thickness correlates with a higher pump threshold.
  • Local field enhancement is confirmed as central to coherent feedback.
  • Anomalous behaviors are linked to modified fluorophore properties near metallic surfaces.

Conclusions:

  • Metallic-dielectric core-shell nanoparticles enable tunable random lasing.
  • Surface plasmon-photon coupling is a key factor in controlling lasing properties.
  • Understanding near-surface effects is vital for optimizing plasmonic random lasers.