Propagation of organic Exciton-Polariton condensates in microwires at room temperature*

Polaritons are hybrid light-matter particles that arise from the strong coupling of light and matter in semiconductor microcavities. When a polaritonic system is pumped above a threshold density, the energy eigenstates of the system collapse into the ground state, creating a coherent, macroscopic wave characterized by a blueshift in energy and a narrowing of linewidth. Previous research in polariton condensation has been conducted on GaAs systems, and more recently, with the incorporation of organics, 2D materials, and perovskites, enabling room temperature observation of such condensates. In this project, we created a DBR-metal microcavity with a conventional fluorescent dye, Rhodamine in a SMILES (small molecule ionic isolation lattice) [1] host, as the active medium. We used Focused Ion Beam (FIB) to etch structures such as microwires and pillars and studied the propagation and localization of these condensates at room temperature using photoluminescence measurements in real and momentum space.