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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
Summary
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.
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.
