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Sioneh Eyvazi¹, Evgeny A Mamonov¹, Rebecca Heilmann¹

¹Department of Applied Physics, Aalto University School of Science, P.O. Box 15100, Aalto FI-00076, Finland.

|March 24, 2025

Summary

This summary is machine-generated.

Researchers achieved lasing in photonic nearly flat bands using periodic metasurfaces with long-range couplings. This breakthrough enables enhanced light localization and new possibilities for photonic devices and quantum phenomena.

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Area of Science:

Photonics
Condensed Matter Physics
Quantum Optics

Background:

Photonic flat bands are essential for light localization and enhanced light-matter interactions.
Current experimental lasing in flat bands is limited to short-range coupling regimes.
Developing new platforms for photonic devices and quantum phenomena requires exploring novel flat band systems.

Purpose of the Study:

To experimentally observe lasing in photonic nearly flat modes.
To investigate the properties of lasing in periodic metasurfaces with long-range couplings.
To explore the potential of these systems for novel photonic applications.

Main Methods:

Fabrication of a periodic metasurface with long-range couplings and guided modes.
Experimental characterization of lasing spectra and mode properties.
Numerical simulations to analyze mode localization and identify bound states in the continuum (BICs).

Main Results:

Experimental observation of lasing in photonic nearly flat modes.
Broad flat lasing spectrum up to k = 2 μm⁻¹ achieved by tuning layer thickness and periodicity.
Simulations confirmed mode localization in both waveguiding and active layers.
Accidental bound states in the continuum (BICs) with topological charge |q| = 1 observed at lasing frequencies.

Conclusions:

Periodic metasurfaces with long-range couplings provide a viable platform for achieving lasing in nearly flat bands.
The observed phenomena open new avenues for robust photonic devices, efficient nonlinear optics, and quantum information processing.
The co-observation of BICs suggests potential for novel topological and quantum optical effects.