Positive–Negative Birefringence in Multiferroic Layered Metasurfaces,Nano Letters

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Positive–Negative Birefringence in Multiferroic Layered Metasurfaces
Nano Letters ( IF 9.6 ) Pub Date : 2016-10-27 00:00:00 , DOI: 10.1021/acs.nanolett.6b03936
R. Khomeriki _{1,

2} , L. Chotorlishvili ₁ , I. Tralle ₃ , J. Berakdar ₁

Affiliation

We uncover and identify the regime for a magnetically and ferroelectrically controllable negative refraction of a light-traversing multiferroic, oxide-based metastructure consisting of alternating nanoscopic ferroelectric (SrTiO₃) and ferromagnetic (Y₃Fe₂(FeO₄)₃, YIG) layers. We perform analytical and numerical simulations based on discretized, coupled equations for the self-consistent Maxwell/ferroelectric/ferromagnetic dynamics and obtain a biquadratic relation for the refractive index. Various scenarios of ordinary and negative refraction in different frequency ranges are analyzed and quantified by simple analytical formula that are confirmed by full-fledge numerical simulations. Electromagnetic waves injected at the edges of the sample are propagated exactly numerically. We discovered that, for particular GHz frequencies, waves with different polarizations are characterized by different signs of the refractive index, giving rise to novel types of phenomena such as a positive–negative birefringence effect and magnetically controlled light trapping and accelerations.

中文翻译：

多铁性层状超表面的正负双折射

我们发现并确定了由交替的纳米铁电（SrTiO ₃）和铁磁（Y ₃ Fe ₂（FeO ₄）₃）组成的光遍历多铁性氧化物基元结构的磁和铁电可控负折射的机制，YIG）图层。我们基于离散的耦合方程对自一致的麦克斯韦/铁电/铁磁动力学进行分析和数值模拟，并获得折射率的二次关系。通过简单的分析公式对不同频率范围内的普通和负折射的各种情况进行了分析和量化，这些公式已通过全面的数值模拟得到了证实。在样品边缘注入的电磁波会精确地数值传播。我们发现，对于特定的GHz频率，具有不同偏振的波具有不同的折射率特征，从而引起新型现象，例如正负双折射效应以及磁控制的光陷获和加速。

更新日期：2016-10-27

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