Organic Exciton-Polariton Lattices

Realizing lattices of exciton polariton condensates has been of much interest owing to the potential of such

systems to realize analog Hamiltonian simulators and physical computing architectures. Prior work on

polariton condensate lattices have primarily been on GaAs based systems with recent advent of organic

molecules and perovskite systems allowing room temperature operation. However in most of these room

temperature systems, the lattices are defined using a bottom up approach by patterning the bottom mirrors.

Here we report an approach that uses Focused Ion Beam (FIB) etching to pattern a planar microcavity.

Such etching of the cavity allows realizing high contrast lattices as was shown previously in GaAs systems

[1]. To generate exciton-polaritons at room temperature, we use the host-guest excitons of small molecular

ionic lattice emitters (SMILES) due to their high photostability and fluorescence quantum yield [2].Here,

we demonstrate patterning different lattice geometries and engineering of potential trap by controlling the

etch depth. We characterized the fabricated lattice by measuring bandstructure and optical non-linearities

using energy resolved wavevector imaging of photoluminescence and power-dependent photoluminescence

measurementa. The present approach allows us to study a variety of polariton condensate lattices at room

temperature using a top down approach without compromising on the quantum yield of the organic

excitonic material embedded in the cavity. Such polariton lattices can find application in physical

computing architectures.

REFERENCES

[1] T. Jacqmin et al. “Direct Observation of Dirac Cones and a Flatband in a Honeycomb Lattice for Polaritons,” Phys. Rev. Lett.

112, 116402 (2014)

[2] Benson, Christopher R., et al. "Plug-and-play optical materials from fluorescent dyes and macrocycles." Chem 6.8 (2020).