Two-dimensional arrays of coupled waveguides or coupled microcavities allow us to confine and manipulate light. Based on a paradigmatic envelope equation, the Lugiato-Lefever equation, researchers from the Nonlinear Optics group headed by Marcel Clerc have shown that these devices, subject to a coherent optical injection, support coexistence between coherent and incoherent emission. In this regime, they show that two-dimensional chimera states can be generated. Depending on initial conditions, the system exhibits a family of two-dimensional chimera states and interaction between them. Two-dimensional chimera states are of spatiotemporal chaotic nature.

The results are published in Chaos: An Interdisciplinary Journal of Nonlinear Science, available at https://aip.scitation.org/doi/10.1063/1.5133836