Using a particle swarm optimization algorithm and finite-difference in time-domain simulations, we optimize the coupling strength between excitons in poly(3-hexylthiophene-2,5-diyl) (P3HT) and surface lattice resonances in open cavities defined by arrays of aluminum nanoparticles. Strong light-matter coupling and the formation of exciton-polaritons are demonstrated. Nanoparticle arrays with optimal dimensions have been fabricated and measured, validating the predictions by the numerical method. P3HT is a regioregular semiconducting polymer used as a donor material in acceptor-donor blends for organic photovoltaic applications. Our results demonstrate the efficacy of the proposed method for the optimization of light-matter coupling and its potential application for the enhanced performance of optoelectronic devices.
Bibliographical noteFunding Information:
This work was financially supported by the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) (Vici Grant No. 680-47-628). P.B. is sponsored by the China Scholarship Council. S.M. acknowledges financial support from MEXT, Japan (Kak-enhi, Grant No 17KK0133).