Canalization acoustic phonon polaritons in metal-MoO3-metal sandwiched structures for nano-light guiding and manipulation

Abstract

We theoretically propose and study in-plane anisotropic acoustic phonon polaritons (APhPs) based on a layered structure consisting of a monolayer (or few layers) α-phase molybdenum trioxide (α-MoO3) sandwiched between two metal layers. We find that the APhPs in the proposed sandwiched structures are a canalization (highly directional) electromagnetic mode propagating along with the layers and at the same time exhibit extreme electromagnetic-field confinement surpassing any other type of phonon-polariton modes. When a double layer of α-MoO3 is sandwiched by two Au layers, twisting the two α-MoO3 layers can adjust the interlayer polaritonic coupling and thus manipulate the in-plane propagation of the highly confined APhPs. Our results illustrate that the metal-MoO3-metal sandwiched structures are a promising platform for light guiding and manipulation at ultimate scale.

7 pages, 4 figures

References in corpus (14)

• Two Dimensional Atomic Crystals
• Sub-diffractional, volume-confined polaritons in a natural hyperbolic material: hexagonal boron nitride
• Observation of topological polaritons and photonic magic angles in twisted van der Waals bi-layers
• Infrared hyperbolic metasurface based on nanostructured van der Waals materials
• Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material
• Configure polaritons in twisted $\alpha$-MoO3
• Moiré Hyperbolic Metasurfaces
• Broad Spectral Tuning of Ultra-Low Loss Polaritons in a van der Waals Crystal by Intercalation
• Twisted Nano-optics: Manipulating Light at the Nanoscale with Twisted Phonon Polaritonic Slabs
• Generalized 4 $\times$ 4 Matrix Formalism for Light Propagation in Anisotropic Stratified Media: Study of Surface Phonon Polaritons in Polar Dielectric Heterostructures
• Far-field Excitation of Single Graphene Plasmon Cavities with Ultra-compressed Mode-volumes
• Hybrid waves localized at hyperbolic metasurfaces
• Collective near-field coupling in infrared-phononic metasurfaces for nano-light canalization
• Phase segregation facilitates exfoliation of franckeite crystals to a single unit cell thickness