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The development of new nanophotonic devices requires the understanding andmodulation of the propagating surface plasmon and phonon modes arising inplasmonic and polar dielectric materials, respectively. Here we explore theCdZnO alloy as a plasmonic material, with a tunable plasma frequency andreduced losses compared to pure CdO. By means of attenuated total reflectance,we experimentally observe the hybridization of the surface plasmon polariton(SPP) with the surface phonon polariton (SPhP) in the air-CdZnO-sapphirethree-layer system. We show how through the precise control of the CdZnOthickness, the resonance frequencies of the hybrid surface plasmon-phononpolariton (SPPP) are tuned in the mid-infrared, and the nature of the hybridmode turns from a plasmon-like behavior in the thicker films to a phonon-likebehavior in the thinnest films. The presence of sapphire phonons not onlyallows the hybrid mode to be formed, but also improves its characteristics withrespect to the bare SPP. The reduced damping of the phonon oscillators allowsto reduce the losses of the hybrid mode, enhancing the propagation length above500 microns, one order of magnitude larger than that of typical SPPs, clearingthe path for its application on emerging devices such as plasmonic waveguides.

A Controllable and Highly Propagative Hybrid Surface Plasmon-Phonon Polariton in a CdZnO-based Two-Interface System