Unidirectional ray polaritons in twisted asymmetric stacks.

ABSTRACT: The vast repository of van der Waals (vdW) materials supporting polaritons offers numerous possibilities to tailor electromagnetic waves at the nanoscale. The development of twistoptics-the modulation of the optical properties by twisting stacks of vdW materials-enables directional propagation of phonon polaritons (PhPs) along a single spatial direction, known as canalization. Here we demonstrate a complementary type of directional propagation of polaritons by reporting the visualization of unidirectional ray polaritons (URPs). They arise naturally in twisted hyperbolic stacks with very different thicknesses of their constituents, demonstrated for homostructures of α -MoO₃ and heterostructures of α -MoO₃ and β -Ga₂O₃. Importantly, their ray-like

SUBMITTER: Alvarez-Cuervo J 

PROVIDER: S-EPMC11490623 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature