Topological Exciton Polaritons in Compact Perovskite Junction Metasurfaces

Abstract

Exciton polaritons are hybrid light-matter quasi-particles that hold exceptionalopportunities for future optoelectronic devices. Taking the synergicadvantages of room-temperature perovskite excitons and topological photonicstructures, topological exciton-polaritons are experimentally demonstrated inorganic–inorganic hybrid perovskite thin films. Topological junction structuresbased on perovskite gratings are realized using a momentum-space analog ofthe 1D Dirac system. Desired enhancement phenomena are observedincluding narrow-beam polariton emission from a tightly localized junctionregion, polaritonic nonlinearity boost, and enhanced luminescence. Theseremarkable features are obtained from highly compact devices with footprintwidths on the order of a few micrometers and are efficiently tailorable withsimple unit-cell geometry control. Therefore, the proposed approach can be apowerful platform for room-temperature topological exciton-polaritons andconcomitant device applications.