AI 中文总结
该研究实现了一种机械可重构的范德华莫尔光子晶体，通过调控二硫化钨薄片的扭转角改变共振特性，使嵌入色心发射增强30倍，为原位色散工程提供了新途径。
AI 中文摘要
莫尔光子学已成为设计和原位调控光学带的热门概念，莫尔效应实现的光局域源于周期性层间的相对扭转，而非固定的预制腔特征。然而迄今为止，在可见光范围内实现实用的莫尔光子晶体仍难以达成，原因在于纳米级结构的工程化以及制造后动态扭转的挑战。在此，我们实现了一种机械可重构的莫尔光子晶体，其由两块图案化的范德华晶体（二硫化钨，WS₂）薄片构成，中间隔有光学活性的六方氮化硼（hBN）间隔层。我们将同一对WS₂薄片的扭转角从3.8°重构至8.4°，并利用动量分辨反射光谱重构了它们的三维色散关系。此外，通过减小薄片间的扭转角，我们观察到更密集的折叠与杂化共振流形，这与嵌入色心的发射增强30倍相吻合。我们的研究结果为利用范德华纳米结构进行原位色散工程和可编程光-物质相互作用开辟了令人兴奋的机遇。
英文摘要
Moiré photonics has emerged as a fascinating concept to design and in situ control of the optical bands. Moiré enabled light localisation arises from the relative twist between periodic layers, rather than from fixed, pre-fabricated cavity features. So far, however, the realisation of practical moiré photonic crystals in the visible range has been elusive, due to challenges in engineering nanoscale structures and twisting them dynamically post fabrication. Here, we realise a mechanically reconfigurable moiré photonic crystal, comprising from two patterned van der Waals crystals (tungsten di sulphide, WS$_2$) slabs separated by an optically active hexagonal boron nitride (hBN) spacer. We reconfigured the same pair of WS$_2$ slabs from a twist angle of 3.8° to 8.4° and reconstructed their three-dimensional dispersion using momentum-resolved reflectivity spectroscopy. Further, by reducing the twist angle between the slabs, we observe a denser manifold of folded and hybridised resonances that coincides with a 30-fold enhancement of emission from embedded colour centres. Our results open exciting opportunities for in-situ dispersion engineering and programmable light matter interactions employing van der Waals nanostructures.
