Fabian Mooshammer, Xinyi Xu, Chiara Trovatello, Zhi Hao Peng, Birui Yang, Jacob Amontree, Shuai Zhang, James Hone, Cory R Dean, P James Schuck, D N Basov
Waveguides play a key role in the implementation of on-chip optical elements and, therefore, lie at the heart of integrated photonics. To add the functionalities of layered materials to existing technologies, dedicated fabrication protocols are required. Here, we build on laser writing to pattern grating structures into bulk noncentrosymmetric transition metal dichalcogenides with grooves as sharp as 250 nm. Using thin flakes of 3R-MoS2 that act as waveguides for near-infrared light, we demonstrate the functionality of the grating couplers with two complementary experiments: first, nano-optical imaging is used to visualize transverse electric and magnetic modes, whose directional outcoupling is captured by finite element simulations...
January 23, 2024: ACS Nano