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Controlling light at the nanoscale by exploiting ultra-confined polaritons -hybrid light and matter waves - in various van der Waals (vdW) materialsempowers unique opportunities for many nanophotonic on-chip technologies. Sofar, mainstream approaches have relied interfacial techniques (e.g., refractiveoptics, meta-optics and moire engineering) to manipulate polariton wavefront.Here, we propose that orbital angular momentum (OAM) of incident light couldoffer a new degree of freedom to structure vdW polaritons. With vortexexcitations, we observed a new class of accelerating polariton waves -Airy-like hyperbolic phonon polaritons (PhPs) in high-symmetry orthorhombic vdWcrystal {\alpha}-MoO3. In analogous to the well-known Airy beams in free space,such Airy-like PhPs also exhibit self-accelerating, nonspreading andself-healing characteristics. Interestingly, the helical phase gradient ofvortex beam leads to asymmetry excitation of polaritons, as a result, theAiry-like PhPs possess asymmetric propagation feature even with a symmetricmode, analogous to the asymmetry hyperbolic shear polaritons in low-symmetrycrystals. Our finding highlights the potential of OAM to manipulate polaritonsin vdW materials, which could be further extended into a variety ofapplications such as active structured polaritonic devices.

Airy-like hyperbolic shear polariton in high symmetry van der Waals crystals