High topological charge lasing in quasicrystals

Kristian Arjas, Jani Matti Taskinen, Rebecca Heilmann, Grazia Salerno and Päivi Törmä ()
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Kristian Arjas: Aalto University School of Science
Jani Matti Taskinen: Aalto University School of Science
Rebecca Heilmann: Aalto University School of Science
Grazia Salerno: Aalto University School of Science
Päivi Törmä: Aalto University School of Science

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Photonic modes exhibiting a polarization winding akin to a vortex possess an integer topological charge. Lasing with topological charge 1 or 2 can be realized in periodic lattices of up to six-fold rotational symmetry—higher order charges require symmetries not compatible with any two-dimensional Bravais lattice. Here, we experimentally demonstrate lasing with topological charges as high as −5, +7, −17 and +19 in quasicrystals. We discover rich ordered structures of increasing topological charges in the reciprocal space. Our quasicrystal design utilizes group theory in determining electromagnetic field nodes, where lossy plasmonic nanoparticles are positioned to maximize gain. Our results open a new path for fundamental studies of higher-order topological defects, coherent light beams of high topological charge, and realizations of omni-directional, flat-band-like lasing.

Date: 2024
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DOI: 10.1038/s41467-024-53952-5

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