双取代铁石榴石中的带状结构重构和表面法拉第旋转

IF 2.8 3区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Sushree S. Dash, Gregory Odegard, and Miguel Levy
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引用次数: 0

摘要

对于厚度小于 50 纳米的薄膜,铋替代镥铁石榴石显示出显著的法拉第旋转(FR)增强效果。研究发现,在波长为 532 nm 的空气-表面界面的 2 nm 范围内,磁光陀螺回转率放大了七倍。本研究深入探讨了导致这种放大的基本物理机制。研究探讨了这些材料的带状结构的近表面变化及其与磁光响应的联系。采用密度泛函理论来研究表面原子的状态密度变化和整体带状结构重组。然后将过渡偶极子矩阵 (TDM) 模型应用于体态和表面态,正确预测了由于整体表面带状结构重构和由此导致的带隙减小而导致的表面法拉第旋转增强。表面与体态的法拉第光谱响应超出了之前的研究,扩展到整个可见光和近红外光谱范围,预测了整个电信波段的显著放大。通过 X 射线光电子能谱 (XPS) 和紫外可见光谱进行的实验分析表明,当薄膜的厚度从 200 纳米减薄到 40 纳米时,带隙会减小。通过深入了解表面法拉第旋转增强的物理起源,这项工作为更有效的小型化法拉第旋转应用开辟了道路。由此揭示的带状结构信息可用于展示新颖和更先进的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Band structure reconfiguration and surface Faraday rotation in Bi-substituted iron garnets
Bismuth-substituted lutetium iron garnets have exhibited a remarkable enhancement in Faraday rotation (FR) for films thinner than 50 nm. A sevenfold amplification in the magneto-optic gyrotropy was found to occur within 2 nm of the air-surface interface at 532 nm wavelength. The present study delves into the underlying physical mechanisms contributing to such amplification. Near-surface changes in band structure in these materials and their connection to the magneto-optic response are explored. Density functional theory is employed to investigate the changes in density of states and overall band structure reconfiguration of surface atoms. The transition dipole matrix (TDM) model is then applied to both bulk and surface states, correctly predicting a Faraday rotation enhancement at the surface as a result of overall surface band structure reconfiguration and resulting bandgap reduction. Surface versus bulk FR spectral response is extended beyond prior studies over the full visible and the near-infrared spectral ranges, predicting significant amplification across the telecom band. Experimental analysis through X-ray photoelectron spectroscopy (XPS) and UV-Vis spectroscopy reveal a reduction in bandgap as films are thinned down from 200 nm to 40 nm. By providing a deeper physical understanding of the origin of enhanced Faraday rotation at the surface, this work opens up avenues for more efficient miniaturized Faraday rotation applications. Knowledge of the band structure information thus uncovered may be used to demonstrate novel and more advanced applications.
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来源期刊
Optical Materials Express
Optical Materials Express MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
5.50
自引率
3.60%
发文量
377
审稿时长
1.5 months
期刊介绍: The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optical Materials Express (OMEx), OSA''s open-access, rapid-review journal, primarily emphasizes advances in both conventional and novel optical materials, their properties, theory and modeling, synthesis and fabrication approaches for optics and photonics; how such materials contribute to novel optical behavior; and how they enable new or improved optical devices. The journal covers a full range of topics, including, but not limited to: Artificially engineered optical structures Biomaterials Optical detector materials Optical storage media Materials for integrated optics Nonlinear optical materials Laser materials Metamaterials Nanomaterials Organics and polymers Soft materials IR materials Materials for fiber optics Hybrid technologies Materials for quantum photonics Optical Materials Express considers original research articles, feature issue contributions, invited reviews, and comments on published articles. The Journal also publishes occasional short, timely opinion articles from experts and thought-leaders in the field on current or emerging topic areas that are generating significant interest.
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