Plasmonic Crystals for Strong Light-Matter Coupling in Carbon Nanotubes.
Their high oscillator strength and large exciton binding energies make single-walled carbon nanotubes (SWCNTs) highly promising materials for the investigation of strong light-matter interactions in the near infrared and at room temperature. To explore their full potential, high-quality cavities-possibly with nanoscale field localization-are required. Here, we demonstrate the room temperature formation of plasmon-exciton polaritons in monochiral (6,5) SWCNTs coupled to the subdiffraction nanocavities of a plasmonic crystal created by a periodic gold nanodisk array. The interaction strength is easily tuned by the number of SWCNTs that collectively couple to the plasmonic crystal. Angle- and polarization resolved reflectivity and photoluminescence measurements combined with the coupled-oscillator model confirm strong coupling (coupling strength ∼120 meV). The combination of plasmon-exciton polaritons with the exceptional charge transport properties of SWCNTs should enable practical polariton devices at room temperature and at telecommunication wavelengths.
Institute for Physical Chemistry, Universität Heidelberg , D-69120 Heidelberg, Germany.
Yuriy
Y
Zakharko
Institute for Physical Chemistry, Universität Heidelberg , D-69120 Heidelberg, Germany.
Arko
A
Graf
Institute for Physical Chemistry, Universität Heidelberg , D-69120 Heidelberg, Germany.
Jana
J
Zaumseil
Plasmon−exciton polaritons; plasmonic crystals; single-walled carbon nanotubes; strong coupling; surface lattice resonances
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