Maneuverable Optical Selection of Multi-Branch Exciton-Polariton Modes in Disk-Shaped Perovskite Microcavities

Exciton-polaritons are composite bosonic quasiparticles formed by the strong coupling of photons and excitons, possessing a hybrid light-matter nature. Under certain conditions, they can achieve Bose–Einstein condensation at room temperature. Additionally, the information carried by photons leaking during their recombination process can be detected in real space. In this paper, halide perovskite materials are utilized within an optical microcavity to design a microdisk with a radius of 3 μm for confining exciton-polaritons. This approach achieves room-temperature condensation of exciton-polaritons in a perovskite crystal potential well and allows for the control of modes with symmetric petal-like shapes. We experimentally and theoretically demonstrate that controlling the relative position of the pump beam and the microdisk enables simultaneous switching of the angular and radial modes of exciton-polaritons, which manifest in real space as petal modes with different numbers of petals and layers. We have achieved the switching between the following modes: low-order petal modes with angular quantum numbers l = 1 and l = 2, characterized by single-orbit petal structures, and high-order petal modes with an angular quantum number l = 7, characterized by multiradial-node petal structures. Polaritons in these modes condense at multiple energy levels of the two lower branches. This study has important implications for the research and development of room-temperature exciton-polariton-based optical logic devices.