Speaker
Description
Strong exciton-photon coupling can steer photophysical processes. However, the picture where the coupling leads to two polaritonic states and a manifold of optically dark states is now questioned. Instead, a picture where inhomogeneous broadening results in a partial photonic contribution to the dark states has gained ground. To understand the consequence of these dark and so-called gray states on polariton photophysics, they first need to be experimentally quantified. In this talk, I will start by discussing how the number of dark states is affected by the cavity mode being coupled. Then, I will use close to ideal polaritons (low energy disorder) to show that the spectral multiplication method is inadequate for simulating spectrally resolved TE and TM emissions. Instead, good agreement between simulations and experiments is received when combining the transfer matrix and source term methods. Finally, I will show that fitting coupled rate equations to experimental emission data enables the absolute value of the dark states to be attained. Furthermore, that the number of dark states increases as the exciton reservoir and lower polariton overlap decreases.
References
The effect of the relative size of the exciton reservoir on polariton photophysics
Rahul Bhuyan, Maksim Lednev, Johannes Feist, Karl Börjesson
Advanced Optical Materials, 2024, 12 (2), 2301383
Quantitative Modeling of Polaritonic Emission Using the Source Term Method
Rahul Bhuyan, Maksim Lednev, Clara Schäfer, Johannes Feist, Karl Börjesson
The Journal of Physical Chemistry Letters, 2025, 16, 6435-6441
Quantifying the Number of Dark, Gray, and Bright States as a Function of Spectral Overlap in Polaritonic Systems
Rahul Bhuyan, Ilia Sokolovskii, Clara Schäfer, Gerrit Groenhof, Karl Börjesson
Submitted