Topological Exciton Polaritons in Compact Perovskite Junction Metasurfaces

Exciton polaritons are hybrid light-matter quasi-particles that hold exceptional opportunities for future optoelectronic devices. Taking the synergic advantages of room-temperature perovskite excitons and topological photonic structures, topological exciton-polaritons are experimentally demonstrated in organic–inorganic hybrid perovskite thin films. Topological junction structures based on perovskite gratings are realized using a momentum-space analog of the 1D Dirac system. Desired enhancement phenomena are observed including narrow-beam polariton emission from a tightly localized junction region, polaritonic nonlinearity boost, and enhanced luminescence. These remarkable features are obtained from highly compact devices with footprint widths on the order of a few micrometers and are efficiently tailorable with simple unit-cell geometry control. Therefore, the proposed approach can be a powerful platform for room-temperature topological exciton-polaritons and concomitant device applications.