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首页> 外文期刊>Physical review >Two-dimensional polaritonic photonic crystals as terahertz uniaxial metamaterials
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Two-dimensional polaritonic photonic crystals as terahertz uniaxial metamaterials

机译：二维极化子光子晶体作为太赫兹单轴超材料

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摘要

Emerging technologies such as quantum cascade lasers enabled the investigation of the most interesting, yet very little explored, THz part of the electromagnetic (EM) spectrum. These THz sources impose a dire need for novel materials suitable for optical components at such frequencies, as traditional visible optics is not appropriate for THz. Here, we explore two-dimensional (2D) photonic crystals (PCs) with either or both constituents made of polar materials, having a polariton gap within or close to the THz regime. Our objective is to create polaritonic composites that behave as extraordinary effective homogeneous uniaxial media, with flexibly engineered EM wave dispersion and high transmissivity in the THz frequency region. Accordingly, it is most important to be able to identify when 2D composites act as effective bulk uniaxial media. Clearly, deviation from standard effective medium predictions does not necessarily imply bulk effective medium picture breakdown. We developed a reliable criterion which provides a clear angular signature of effective medium behavior in 2D composites, even in the presence of high losses. Relying on this criterion, we characterized polar-dielectric and polar-polar PC composites acting as homogeneous uniaxial metamaterials for any arbitrary incident angle. We selected certain cases of effective metamaterial composites which demonstrate a polarization filter behavior. In particular, our results suggest that an unpolarized source will lead to either an S- or a P-polarized wave just by changing the angle of incidence of the impinging wave, irrespective of the thickness of the composite metamaterial. Furthermore, we show that transmission through a LiF/NaCl composite can be as high as 20%, even though transmission through an identical slab made from either of the two polar constituents would be next to zero. We analyze and discuss the physical origins underpinning such extraordinary angular transmission profile of these metamaterial composites. Our results suggest that appropriate mixing of polar materials with each other or with high-index dielectrics provides a route to making advanced photonic materials that are highly attractive for THz optical components.
机译：量子级联激光器等新兴技术使人们能够研究电磁（EM）谱中最有趣但很少探索的THz部分。由于传统的可见光学不适用于太赫兹，因此这些太赫兹源迫切需要适用于这种频率的光学组件的新型材料。在这里，我们探索二维（2D）光子晶体（PC），其中的一种或两种成分均由极性材料制成，其极化子间隙在THz范围内或接近THz范围。我们的目标是制造具有优异性能的均质单轴介质，在太赫兹频率范围内灵活设计的EM波色散和高透射率的极化复合材料。因此，最重要的是能够确定2D复合材料何时充当有效的整体单轴介质。显然，偏离标准有效媒体预测并不一定意味着大量有效媒体图片会崩溃。我们开发了一种可靠的标准，即使在高损耗的情况下，也能为2D复合材料的有效介质行为提供清晰的角度特征。依靠这一标准，我们表征了极性介电和极性-极性PC复合材料在任意入射角下均作为均匀单轴超材料的作用。我们选择了有效的超材料复合材料的某些案例，这些案例证明了偏振滤波器的行为。特别是，我们的结果表明，无论复合超材料的厚度如何，仅改变入射波的入射角，非极化源都会导致S极化或P极化波。此外，我们显示通过LiF / NaCl复合材料的透射率可以高达20％，即使通过由两种极性成分之一制成的相同平板的透射率接近于零。我们分析和讨论了这些超材料复合材料这种非凡的角传输轮廓的物理起源。我们的结果表明，极性材料相互之间或与高折射率电介质的适当混合可提供一种制造对THz光学组件极具吸引力的先进光子材料的途径。

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  • 来源
    《Physical review》 |2011年第3期|p.035128.1-035128.22|共22页
  • 作者

    S. Foteinopoulou; M. Kafesaki; E. N. Economou; C. M. Soukoulis;

  • 作者单位

    School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, United Kingdom,Institute of Electronic Structure and Lasers (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, GR-71110 Crete, Greece;

    Institute of Electronic Structure and Lasers (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, GR-71110 Crete, Greece,Department of Materials Science and Technology, University of Crete, Heraklion, Crete, Greece;

    Institute of Electronic Structure and Lasers (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, GR-71110 Crete, Greece,Department of Physics, University of Crete, Heraklion, Crete, Greece;

    Institute of Electronic Structure and Lasers (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, GR-71110 Crete, Greece,Department of Materials Science and Technology, University of Crete, Heraklion, Crete, Greece,Ames Laboratory-USDOE, and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

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  • 关键词

    optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity); electromagnetic wave propagation; radiowave propagation; photonic bandgap materials;

    机译：光学常数（包括折射率;复介电常数;吸收率;反射和透射系数;发射率）;电磁波传播无线电波传播;光子带隙材料;

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