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Tailoring light-matter interaction is essential to realize nanophotoniccomponents. It can be achieved with surface phonon polaritons (SPhPs), anexcitation of photons coupled with phonons of polar crystals, which also occurin 2d materials such as hexagonal boron nitride or anisotropic crystals.Ultra-confined resonances are observed by restricting the SPhPs to cavities.Phase-change materials (PCMs) enable non-volatile programming of these cavitiesbased on a change in the refractive index. Recently, the new plasmonic PCMIn$_3$SbTe$_2$ (IST) was introduced which can be reversibly switched from anamorphous dielectric state to a crystalline metallic one in the entire infraredto realize numerous nanoantenna geometries. However, reconfiguring SPhPresonators to modify the confined polaritons modes remains elusive. Here, wedemonstrate direct programming of confined SPhP resonators by phase-switchingIST on top of a polar silicon carbide crystal and investigate the stronglyconfined resonance modes with scanning near-field optical microscopy.Reconfiguring the size of the resonators themselves result in enhanced modeconfinements up to a value of $\lambda/35$. Finally, unconventional cavityshapes with complex field patterns are explored as well. This study is a firststep towards rapid prototyping of reconfigurable SPhP resonators that can beeasily transferred to hyperbolic and anisotropic 2d materials.

Direct programming of confined Surface Phonon Polariton Resonators using the plasmonic Phase-Change Material In$_3$SbTe$_2$