Broadband and Tunable Light Harvesting in Nanorippled MoS(2) Ultrathin Films

[Image: see text] Nanofabrication of flat optic silica gratings conformally layered with two-dimensional (2D) MoS(2) is demonstrated over large area (cm(2)), achieving a strong amplification of the photon absorption in the active 2D layer. The anisotropic subwavelength silica gratings induce a highly ordered periodic modulation of the MoS(2) layer, promoting the excitation of Guided Mode Anomalies (GMA) at the interfaces of the 2D layer. We show the capability to achieve a broadband tuning of these lattice modes from the visible (VIS) to the near-infrared (NIR) by simply tailoring the illumination conditions and/or the period of the lattice. Remarkably, we demonstrate the possibility to strongly confine resonant and nonresonant light into the 2D MoS(2) layers via GMA excitation, leading to a strong absorption enhancement as high as 240% relative to a flat continuous MoS(2) film. Due to their broadband and tunable photon harvesting capabilities, these large area 2D MoS(2) metastructures represent an ideal scalable platform for new generation devices in nanophotonics, photo- detection and -conversion, and quantum technologies.