Giant Optical Anisotropy in a Natural van der Waals Hyperbolic Crystal for Visible Light Low-Loss Polarization Control.

ABSTRACT: Optically anisotropic bidimensional crystals offer a promising path toward compact, lithography-free polarization control in integrated photonic devices. However, most materials exhibit only modest optical anisotropy, requiring long propagation lengths to effectively modify the polarization state of light, hindering miniaturization and integration. While some materials achieve strong polarization extinction via directional absorption, this often comes at the cost of high optical losses, limiting their practical use. Here, we investigate the van der Waals crystal MoOCl₂ that exhibits broadband in-plane hyperbolicity spanning the visible to near-infrared spectrum, driven by a Drude-like response. Thin MoOCl₂ (∼100-200 nm) flakes achieve high reflectivity (>80%) along th

SUBMITTER: Melchioni N 

PROVIDER: S-EPMC12269362 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature