We characterize spin-polarized lasing in a two-dimensional photonic lattice fabricated from a GaAs/InGaAs semiconductor microcavity sample. The lattice is defined by a staggered arrangement of rounded rectangular micrometric mesas that laterally confine and couple the optical modes. Polarization-, angle-, and energy-resolved micro-photoluminescence measurements reveal the transition from the strong-coupling regime to photon lasing, accompanied by extended spatial coherence across several lattice unit cells. Under circularly polarized nonresonant excitation, the emitted light acquires a controllable circular polarization whose handedness follows that of the pump. These results establish photonic-lattice VCSELs as a platform for spin-controlled coherent emission in extended optical systems.
@article{arxiv.2605.20927,
title = {Spin-polarized lasing in a photonic lattice},
author = {A. Herrero Otermin and N. Carlon Zambon and A. Bieganowska and F. Jabeen and L. Viña and C. Antón-Solanas},
journal= {arXiv preprint arXiv:2605.20927},
year = {2026}
}