Tabataba-Vakili Farsane, Krelle Lukas, Husel Lukas, Nguyen Huy P G, Li Zhijie, Bilgin Ismail, Watanabe Kenji, Taniguchi Takashi, Högele Alexander
Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany.
Munich Center for Quantum Science and Technology (MCQST), Schellingtraße 4, 80799 München, Germany.
Nano Lett. 2024 Aug 21;24(33):10090-10097. doi: 10.1021/acs.nanolett.4c02043. Epub 2024 Aug 6.
Metasurfaces allow light to be manipulated at the nanoscale. Integrating metasurfaces with transition metal dichalcogenide monolayers provides additional functionality to ultrathin optics, including tunable optical properties with enhanced light-matter interactions. In this work, we demonstrate the realization of a polaritonic metasurface utilizing the sizable light-matter coupling of excitons in monolayer WSe and the collective lattice resonances of nanoplasmonic gold arrays. We developed a novel fabrication method to integrate gold nanodisk arrays in hexagonal boron nitride and thus simultaneously ensure spectrally narrow exciton transitions and their immediate proximity to the near-field of array surface lattice resonances. In the regime of strong light-matter coupling, the resulting van der Waals metasurface exhibits all key characteristics of lattice polaritons, with a directional and linearly polarized far-field emission profile dictated by the underlying nanoplasmonic lattice. Our work can be straightforwardly adapted to other lattice geometries, establishing structured van der Waals metasurfaces as means to engineer polaritonic lattices.
超表面能够在纳米尺度上对光进行操控。将超表面与过渡金属二卤化物单层相结合，可为超薄光学器件增添额外功能，包括具有增强光与物质相互作用的可调光学特性。在这项工作中，我们展示了一种极化激元超表面的实现，该超表面利用了单层WSe中激子可观的光与物质耦合以及纳米等离子体金阵列的集体晶格共振。我们开发了一种新颖的制造方法，将金纳米盘阵列集成到六方氮化硼中，从而同时确保光谱窄的激子跃迁以及它们与阵列表面晶格共振近场的直接接近。在强光与物质耦合的 regime 中，所得的范德华超表面展现出晶格极化激元的所有关键特性，其远场发射轮廓由底层的纳米等离子体晶格决定，具有方向性且呈线性极化。我们的工作可直接应用于其他晶格几何结构，将结构化的范德华超表面确立为设计极化激元晶格的手段。
