Visible-frequency hyperbolic plasmon polaritons in a natural van der Waals crystal.

ABSTRACT: Controlling light at subwavelength scales is crucial in nanophotonics. Hyperbolic polaritons, supporting arbitrarily large wavevectors, enable extreme light confinement beyond the diffraction limit. Traditional hyperbolic metamaterials suffer from high losses due to metallic components, while natural low-loss hyperbolic phonon polaritons are limited to the mid-infrared range. Some hyperbolic materials at visible frequencies have been studied, but they are either very lossy or only feature out-of-plane hyperbolicity. Here, we demonstrate the presence of low-loss, in-plane hyperbolic plasmon polaritons in the visible and near-infrared in thin-films of MoOCl₂, a natural van der Waals crystal. The polariton dispersion is predicted based on the framework of light propagation in biaxi

SUBMITTER: Venturi G 

PROVIDER: S-EPMC11551187 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature