Large‐Area Flat Optics Color Routing in Tilted Arrays of 2D Semiconductor Nanostripes

Here, we introduce a scalable and self-organised flat optics platform based on centimetre-scale arrays of tilted Transition Metal Dichalcogenide (TMD) MoS2 nanostripes, fabricated through an ion-beam–driven faceting strategy that precisely defines the slope and periodicity of silica templates. This engineered morphology enables maskless, shadow-assisted growth of crystalline MoS2 nanostripes with controlled geometry and high uniformity. The resulting hybrid architecture activates strong diffractive and resonant interactions, yielding pronounced Rayleigh anomalies and guided photonic modes. Angle-resolved scattering measurements reveal powerful color routing capabilities in 20 nm MoS2 nanostripe arrays, with in-plane confined beams amplified by over 30× compared to a 180 nm bare silica grating. Increasing the TMD thickness drives a transition from Rayleigh-dominated to Mie-enhanced scattering, producing sharply directional resonances across the visible spectrum with forward directivities exceeding 25 dB. In addition to directional control, Rayleigh anomalies and guided photonic modes also enable strong light harvesting, resulting in up to 148% resonant absorption enhancement compared to flat MoS2 films. These findings demonstrate that engineered 2D-semiconductor nanostripes can outperform conventional dielectric metasurfaces in thickness-normalized efficiency, establishing tilted TMD architectures as a transformative route toward ultrathin, large-area, and high-performance color routing and nanophotonic control