(411a) Using Angular Emission to Understand Quantum-Optic Active Nanomaterials

We live in an incredibly exciting time. The observation of extraordinary quantum optical phenomena, which has been historically limited to very exotic materials, is now being observed in solution processed, colloidal nanomaterials. Not only are these developments promising for current applications in energy production and usage, but they can also enable next generation technologies in quantum information, nearfield communication, and highly directional, bio-mimicking devices. Because coherent and quantum phenomena exhibit highly directional properties, we must understand the fundamental directional light-material properties of nanocrystals in order to achieve these new technologies. In this presentation, we will focus on the angular light emission properties of CsPbX₃ (X – halide) nanocrystals. We use back focal plane microscopy to determine the electronic transition alignments of monolayers, mixed films, and assembled superlattices to quantify how structure and local environments drive these behaviors. Understanding the interplay of surface chemistry and structure of these nanomaterial assemblies will elucidate why nanocrystals, which typically suffer from high optical decoherence and non-homogeneous size distributions, can achieve these quantum-light characteristics and further allow us to rationally design materials for next generation technologies.