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    Flat-band photonic lattices enable stable, cooperative laser emission. Selective pumping of coupled microring lattices induces lasing in a flat band supermode, overcoming degeneracy challenges.

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    Area of Science:

    • Photonics
    • Condensed Matter Physics
    • Quantum Optics

    Background:

    • Flat-band photonic lattices offer unique light manipulation properties.
    • These lattices, characterized by flat Bloch bands, are promising for light trapping and distortion-free imaging.
    • Degeneracy in flat bands typically complicates coherent light emission.

    Purpose of the Study:

    • To investigate the potential for stable and cooperative laser emission in flat-band photonic lattices.
    • To explore methods for overcoming the challenges posed by flat-band supermode degeneracy.
    • To demonstrate cooperative lasing in a specific quasi one-dimensional lattice system.

    Main Methods:

    • Theoretical analysis of a quasi one-dimensional rhombic lattice of coupled semiconductor microrings.
    • Modeling the effects of optical gain on the flat-band system.
    • Simulating selective pumping of outer sublattices to induce lasing.

    Main Results:

    • Flat-band lattices can exhibit stable and cooperative laser emission despite high degeneracy.
    • Selective pumping of outer sublattices successfully induced lasing.
    • The emission occurred in a supermode of the flat band, confirming theoretical predictions.

    Conclusions:

    • Flat-band photonic lattices are viable platforms for cooperative laser emission.
    • Selective pumping offers a controllable method to achieve lasing in these degenerate systems.
    • This work opens new avenues for designing advanced photonic devices and light sources.