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Artificial one- and two-dimensional lattices have emerged as a powerfulplatform for the emulation of lattice Hamiltonians, the fundamental study ofcollective many-body effects as well as phenomena arising from non-trivialtopology. Exciton-polaritons, bosonic part-light and part-matterquasiparticles, combine pronounced nonlinearities with the possibility ofon-chip implementation. In this context, organic semiconductors, hostingultra-stable Frenkel excitons, embedded in a microcavity have proven to beversatile contenders for the study of nonlinear many-body physics and bosoniccondensation, which also enable deployment at ambient conditions. Here, weimplement a well-controlled, high-quality optical lattice, hosting light-matterquasi-particles. The realized polariton graphene presents with excellent cavityquality factors, showing distinct signatures of Dirac cone and flatbanddispersions as well as polariton lasing at room temperature. This is realizedby filling coupled dielectric microcavities with the fluorescent proteinmCherry. We demonstrate the emergence of a coherent polariton condensate atambient conditions, profiting from coupling conditions as precise andcontrollable as in state-of-the-art inorganic semiconductor-based systems,without limitations due to e.g. lattice matching in epitaxial growth. Thisprogress allows straightforward extension to more complex systems, such as thestudy of topological phenomena in two-dimensional lattices includingtopological lasers and non-Hermitian optics.

Observation of Dirac cones and room temperature polariton lasing in an organic honeycomb lattice