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Polaritonic materials that support epsilon-near-zero (ENZ) modes offer theopportunity to design light-matter interactions at the nanoscale throughphenomena like resonant perfect absorption and extreme sub-wavelength lightconcentration. To date, the utility of ENZ modes is limited in propagatingpolaritonic systems by a relatively flat spectral dispersion, which gives ENZmodes small group velocities and short propagation lengths. Here we overcomethis constraint by coupling ENZ modes to surface plasmon polariton (SPP) modesin doped cadmium oxide ENZ-on-SPP bilayers. What results is a strongly coupledhybrid mode, characterized by strong anti-crossing and a large spectralsplitting on the order of 1/3 of the mode frequency. The resonant frequencies,dispersion, and coupling of these polaritonic-hybrid-epsilon-near-zero (PH-ENZ)modes are controlled by tailoring the modal oscillator strength and the ENZ-SPPspectral overlap, which can potentially be utilized for actively tunable strongcoupling at the nanoscale. PH-ENZ modes ultimately leverage the most desirablecharacteristics of both ENZ and SPP modes through simultaneous strong interiorfield confinement and mode propagation.

Polaritonic hybrid-epsilon-near-zero modes: engineering strong optoelectronic coupling and dispersion in doped cadmium oxide bilayers