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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.

Broadband and Tunable Light Harvesting in Nanorippled MoS2 Ultrathin Films

Broadband and Tunable Light Harvesting in Nanorippled MoS₂ Ultrathin Films