Dielectric permittivity tensor dynamics of in-plane hyperbolic van der Waals MoOCl2 and emergent chiral photonic applications
arXiv:2512.08383 · doi:10.1038/s41699-026-00681-6
Abstract
Van der Waals (vdW) crystals offer unique opportunities for modern nanophotonic applications owing to their intrinsic anisotropic nature. While most of them exhibit uniaxial anisotropy arising from weak out-of-plane vdW interaction, some of their representative families also exhibit an in-plane biaxial anisotropy. Among the latter, outstand vdW oxochlorides with in-plane axes of a different physical character (metallic or dielectric). Here, we present an accurate dynamics of dielectric permittivity tensor components of vdW MoOCl2 in the ultraviolet (UV) to visible (Vis) spectral region partly covering near-infrared (NIR). Addressing its enormously anisotropic optical constants, we focus on another hyperbolicity window of vdW MoOCl2 emerging in the UV spectral region that may potentially unlock rich light-matter interaction effects. Furthermore, we propose an approach towards designing nanoscale handedness preserved Vis light circular polarizers based on twisted helical vdW MoOCl2 heterostructures. Our findings display that vdW MoOCl2 provides a highly promising platform not only for hyperbolic, but also for chiral nanophotonic applications.
References in corpus (30)
- Electric Field Effect in Atomically Thin Carbon Films
- Two-Dimensional Gas of Massless Dirac Fermions in Graphene
- Atomically thin MoS2: A new direct-gap semiconductor
- Two Dimensional Atomic Crystals
- Van der Waals heterostructures
- Black phosphorus field-effect transistors
- 2D materials and van der Waals heterostructures
- Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
- Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
- Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
- Type-II Weyl Semimetals
- Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
- Two-dimensional materials from high-throughput computational exfoliation of experimentally known compounds
- Direct observation of the transition from indirect to direct bandgap in atomically thin epitaxial MoSe2
- Tightly bound excitons in monolayer WSe2
- Signatures of moiré-trapped valley excitons in MoSe/WSe heterobilayers
- Observation of topological polaritons and photonic magic angles in twisted van der Waals bi-layers
- Recent progress in the assembly of nanodevices and van der Waals heterostructures by deterministic placement of 2D materials
- Twistable electronics with dynamically rotatable heterostructures
- Broad Spectral Tuning of Ultra-Low Loss Polaritons in a van der Waals Crystal by Intercalation
- Micro-reflectance and transmittance spectroscopy: a versatile and powerful tool to characterize 2D materials
- Naturally occurring van der Waals materials
- Moiré excitons in MoSe-WSe heterobilayers and heterotrilayers
- Deep-ultraviolet electroluminescence and photocurrent generation in graphene/hBN/graphene heterostructures
- Roadmap for Photonics with 2D Materials
- Dyakonov Waves in Biaxial Anisotropic Crystals
- Flat bands and chiral optical response of moiré insulators
- Highly anisotropic two-dimensional metal in monolayer MoOCl
- Chiral photonic super-crystals based on helical van der Waals homostructures
- Strongly anisotropic electronic and magnetic structures in oxide dichlorides RuOCl and OsOCl