Strong and Engineerable Optical Anisotropy in Easily Integrable Epitaxial SrO(SrTiO3)N Ruddlesden–Popper Thin Layers

IF 7.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Mohamed Oussama Bounab, Clarisse Furgeaud, Sébastien Cueff, Lotfi Berguiga, Romain Bachelet, Mohamed Bouras, Laurent Pedesseau, Jacky Even, Ludovic Largeau, Guillaume Saint-Girons
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Abstract

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(SrTiO3)N phases (STO-RPN), epitaxial thin films composed of a SrTiO3 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-RPN thin layers can be fabricated using industry-standard growth processes. As it can be epitaxially grown on Si and GaAs using SrTiO3 templates, the work paves the way for their compact integration on these photonic platforms.

Abstract Image

易积外延SrO(SrTiO3)N rudlesden - popper薄层的强且可工程的光学各向异性
光学各向异性是许多光子器件的关键特性。然而,适合这种应用的大块各向异性材料仍然相对稀少,并且通常难以合成薄膜。此外,各向异性超材料的光学损耗和复杂的结构阻碍了它们在光子器件中的可积性。基于椭偏测量和反射率,本文证明了Ruddlesden-Popper (RP) SrO(SrTiO3)N相(ston - rpn)外延薄膜在宽光谱范围内表现出明显的二色性和双折射。该外延薄膜由SrTiO3晶格周期性中断,每N个单元格一个SrO原子平面。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相比,STO-RPN薄层可以使用工业标准的生长工艺来制造。由于它可以使用SrTiO3模板在Si和GaAs上外延生长,因此该工作为它们在这些光子平台上的紧凑集成铺平了道路。
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来源期刊
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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