Polariton Formation from Soret Band Excitons in Metal–Organic Frameworks and Plasmonic Lattices

Abstract

This Letter describes strong coupling between a plasmonic nanoparticle (NP) lattice cavity and Soret excitons in a metal−organic framework (MOF) film. In optical transmission measurements, we observed a lower polariton mode that can be spectrally tuned by infiltrating MOF pores with solvents of different refractive index. Using transient absorption spectroscopy, both the lower and upper polariton modes can be resolved, with an estimated Rabi splitting of ∼300 meV, nearly twice that of other plasmonic cavity−organic emitter systems. The polariton modes decay more rapidly than that of the uncoupled exciton. This hybrid system highlights the advantages of open plasmonic cavities for tunable coupling and the use of transient absorption spectroscopy to identify polariton modes.

Electrochemical Control of Strong Coupling of CdSe Exciton-Polaritons in Plasmonic Cavities

“…Plasmonic nanoparticle lattices are advantageous cavities for strong coupling and for carrying out chemical reactions due to their open lattice structure. [34][35][36][37] Periodic lattices of metallic nanoparticles can support high-quality surface lattice resonance (SLR) cavity modes by coupling the localized surface plasmons of each nanoparticle to the diffractive photonic modes in the lattice in an index-matched environment. [38][39] The single substrate and metal nanoparticles of the cavity facilitate incorporation into spectroelectrochemistry experiments, as the cavity is accessible to solvents and reagents, and the lattices can be fabricated on transparent conductive substrates.…”

Electrochemical Control of Strong Coupling of CdSe Exciton-Polaritons in Plasmonic Cavities

“…Plasmonic nanoparticle lattices are advantageous cavities for strong coupling and for carrying out chemical reactions due to their open lattice structure. − Periodic lattices of metallic nanoparticles can support high-quality surface lattice resonance (SLR) cavity modes by coupling the localized surface plasmons of each nanoparticle to the diffractive photonic modes in the lattice in an index-matched environment. , The single substrate and metal nanoparticles of the cavity facilitate incorporation into spectroelectrochemistry experiments, as the cavity is accessible to solvents and reagents, and the lattices can be fabricated on transparent conductive substrates . By tuning nanoparticle material and shape as well as periodicity, plasmonic lattice cavities can be designed to interact with different excitonic materials …”