AI 中文总结
研究如何创建片上全范德瓦尔斯偏振光学元件，以近红外四分之一波片为例，利用特定vdW异质结构实现。通过FDTD模拟揭示相关效应，建立实用途径，为基于层状材料的纳米光子架构提供基础。
AI 中文摘要
将偏振控制元件集成到纳米级光子电路中仍然是现代片上光学技术的核心挑战，这些技术需要持续小型化。范德瓦尔斯（vdW）晶体因其强光学各向异性、高折射率和原子级精确的异质结构组装能力，为创建此类组件提供了一个通用平台。在这项工作中，我们展示了一种创建全vdW片上偏振光学元件的方法，以在近红外（NIR）光谱区域工作的四分之一波片为例，在Si/SiO2平台上的特定扭曲ReSe2/α-MoO3 vdW异质结构中实现。低对称ReSe2层作为极高线性偏振激子发射的源，而面内双折射α-MoO3提供偏振态转换。此外，我们的时域有限差分（FDTD）模拟以高精度定量再现了实验观察结果，揭示了层厚度、扭曲角、法布里-珀罗干涉和发射器分布效应在确定偏振转换效率中的关键作用，对于优化参数化，其产生高达95%的圆偏振度（DoCP）。我们的发现为完全集成的全vdW偏振光学元件建立了一条实用途径，为完全基于层状材料的纳米级光子架构提供了基础。
英文摘要
The integration of polarization-control elements into nanoscale photonic circuits remains a central challenge for modern on-chip optical technologies, which call for continuous miniaturization. Van der Waals (vdW) crystals provide a versatile platform for the creation of such components owing to their strong optical anisotropy, high-refractive indices and atomically precise heterostructure assembly capabilities. In this work, we demonstrate an approach towards the creation of all-vdW on-chip polarization optical components, exemplified with quarter-wave plates operating in the near-infrared (NIR) spectral region, realized in specifically twisted ReSe2/alpha-MoO3 vdW heterostructures on a Si/SiO2 platform. Here, low-symmetry ReSe2 layer serves as a source of exceptionally high linearly polarized excitonic emission, whereas in-plane birefringent alpha-MoO_3 provides polarization-state conversion. Furthermore, our finite-difference time-domain (FDTD) simulations quantitatively reproduce the experimental observations with high accuracy revealing the critical roles of layer thicknesses, twist-angle, Fabry-Perot interference and emitter distribution effects in the determination of polarization conversion efficiency, which yields up to 95 % degrees of circular polarization (DoCP) for the optimized parametrization. Our findings establish a practical route towards fully integrated all-vdW polarization optical components, providing a foundation for nanoscale photonic architectures based entirely on layered materials.
Comments13 pages, 3 figures
