SCOLED researchers from Aalto University demonstrate flat-band lasing in nanoparticle chain systems

Researchers at Aalto University introduced chains of nanoparticles that support totally flat bands extending over the full angular range. By combining single chains with an organic gain medium, they demonstrated flat-band lasing and explained the transition to Γ-point lasing as the number of chains is increased. Moreover, partially coherent emission from square and triangular two-dimensional chain lattices was shown. The excited modes depend on the pump power and polarization. These results establish chain lattices as a versatile platform for exploring flat-band lasing and suggest new routes toward narrow-band, linearly polarized, and bright light sources with tailored coherence.

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