Lee Myungjae, Hong Hanyu, Yu Jaehyung, Mujid Fauzia, Ye Andrew, Liang Ce, Park Jiwoong
James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea.
Science. 2023 Aug 11;381(6658):648-653. doi: 10.1126/science.adi2322. Epub 2023 Aug 10.
The efficient, large-scale generation and control of photonic modes guided by van der Waals materials remains as a challenge despite their potential for on-chip photonic circuitry. We report three-atom-thick waveguides-δ waveguides-based on wafer-scale molybdenum disulfide (MoS) monolayers that can guide visible and near-infrared light over millimeter-scale distances with low loss and an efficient in-coupling. The extreme thinness provides a light-trapping mechanism analogous to a δ-potential well in quantum mechanics and enables the guided waves that are essentially a plane wave freely propagating along the in-plane, but confined along the out-of-plane, direction of the waveguide. We further demonstrate key functionalities essential for two-dimensional photonics, including refraction, focusing, grating, interconnection, and intensity modulation, by integrating thin-film optical components with δ waveguides using microfabricated dielectric, metal, or patterned MoS.
尽管范德华材料在片上光子电路方面具有潜力，但由其引导的光子模式的高效、大规模产生和控制仍然是一个挑战。我们报道了基于晶圆级二硫化钼（MoS）单层的三原子厚波导——δ波导，它能够在毫米级距离上以低损耗和高效的光耦合来引导可见光和近红外光。这种极端的薄度提供了一种类似于量子力学中δ势阱的光捕获机制，并使得导波基本上成为一种平面波，它在平面内沿波导自由传播，但在平面外方向受到限制。我们通过使用微加工的电介质、金属或图案化的MoS将薄膜光学元件与δ波导集成，进一步展示了二维光子学所必需的关键功能，包括折射、聚焦、光栅、互连和强度调制。
