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Tailorable Topological Multimode Nanolaser with Mutually Incoherent Modes.

Laura Yrjänheikki1, Roman Calpe1, Marek Nečada1

  • 1Center for Photonics Sciences, University of Eastern Finland, FI-80100 Joensuu, Finland.

ACS Nano
|June 29, 2026
PubMed
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Researchers developed a tunable topological multimode nanolaser. This laser supports simultaneous lasing in different topological modes that are mutually incoherent, ideal for applications like multiplexed communication.

Area of Science:

  • Photonics
  • Nanotechnology
  • Topological Photonics

Background:

  • Topological photonics offers novel ways to control light.
  • Nanolasers are crucial for integrated photonic circuits.
  • Understanding mode interactions in nanolasers is key for device applications.

Purpose of the Study:

  • To demonstrate a tailorable topological multimode nanolaser.
  • To investigate the interplay between topologically distinct modes.
  • To explore the coherence properties of simultaneous lasing modes.

Main Methods:

  • Fabrication of gold nanoparticle arrays in a dye gain medium.
  • Angle- and wavelength-resolved spectroscopy.
  • Spatial and temporal coherence characterization using interferometry and cross-correlation frequency-resolved optical gating.
Keywords:
coherencenanolasersplasmonic latticessurface lattice resonancestopological photonics

Related Experiment Videos

Main Results:

  • Simultaneous lasing in topologically trivial dipolar and nontrivial quasi-bound-state-in-the-continuum (qBIC) modes.
  • Mode behavior and far-field emission depend on nanoparticle size.
  • Topologically distinct modes exhibit orthogonal polarizations and are mutually incoherent.
  • Tunable contributions of lasing modes by adjusting nanoparticle geometry.

Conclusions:

  • Demonstrated a tailorable topological multimode nanolaser.
  • Showcased the potential for independent control of distinct topological modes.
  • Highlighted the advantage of mutual incoherence for applications like multiplexed communication and multichannel sensing.