标题： 易于集成的外延SrO(SrTiO3)N Ruddlesden--Popper薄膜中的强可编程光学各向异性 显示英文标题

标题： Strong and Engineerable Optical Anisotropy in Easily Integrable Epitaxial SrO(SrTiO 3 ) N Ruddlesden--Popper Thin Layers

摘要： 光学各向异性是众多光子器件的关键特性。 然而，适用于此类应用的体各向异性材料仍然相对稀少，并且通常在合成薄膜时具有挑战性。 此外，光学损耗以及各向异性超材料的复杂结构阻碍了它们在光子器件中的集成。 基于椭偏测量与反射率的结合，这里展示了Ruddlesden-Popper (RP) SrO(SrTiO 3 ) N 相(STO-RP N )，由SrTiO 3 晶格组成，每隔N个单元细胞被一层SrO原子平面周期性地打断，可以在广泛的光谱范围内表现出显著的二色性和双折射。 值得注意的是，这种各向异性可以通过调整RP顺序N来调节。与文献中报道的大多数其他各向异性材料不同，STO-RP N 薄层可以使用行业标准的生长工艺进行制造。 由于可以在使用SrTiO 3 模板的Si和GaAs上外延生长，这项工作为它们在这些光子平台上的紧凑集成铺平了道路。 显示英文摘要

摘要： Optical anisotropy is a key property for numerous photonic devices. However, bulk anisotropic materials suitable for such applications remain relatively scarse and are often challenging to synthesize as thin films. Additionally, the optical losses as well as the complex structuration of anisotropic metamaterials hinder their integrability in photonic devices. Based on ellipsometry measurements coupled with reflectance, it is demonstrated here that Ruddlesden-Popper (RP) SrO(SrTiO 3 ) N phases (STO-RP N ), epitaxial thin films composed of a SrTiO 3 lattice periodically interrupted by one SrO atomic plane every N unit cells, exhibit pronounced dichroism and birefringence over a broad spectral range. Notably, this anisotropy is tunable by adjusting the RP order N. In contrast to most other anisotropic materials reported in the literature, STO-RP N thin layers can be fabricated using industry-standard growth processes. As it can be epitaxially grown on Si and GaAs using SrTiO 3 templates, the work paves the way for their compact integration on these photonic platforms.