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Nanofabrication of flat optic silica gratings conformally layered with two-dimensional (2D) MoS2 is demonstrated over large area (cm2), 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 MoS2 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 MoS2 layers via GMA excitation, leading to a strong absorption enhancement as high as 240% relative to a flat continuous MoS2 film. Due to their broadband and tunable photon harvesting …
American Chemical Society
Publication date: 
9 Mar 2021

Mukul Bhatnagar, Matteo Gardella, Maria Caterina Giordano, Debasree Chowdhury, Carlo Mennucci, Andrea Mazzanti, Giuseppe Della Valle, Christian Martella, Pinakapani Tummala, Alessio Lamperti, Alessandro Molle, Francesco Buatier de Mongeot

Biblio References: 
Volume: 13 Issue: 11 Pages: 13508-13516
ACS applied materials & interfaces