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Resonant coupling of dielectric waveguides with plasmonic metaatoms

机译：介电波导与等离子体元原子的共振耦合

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摘要

Metamaterials promise the possibility to tailor the propagation properties of light at the nano-seale. With this contribution we explore the possibility to combine the concept of metamaterials with integrated optics. We investigate a system consisting of a one-dimensional array of double cut-wires (two very thin gold sheets separated by a dielectric spacer) placed on top of a dielectric slab waveguide, which supports only t he fundamental TE and TM mode in the near infrared spectral region around 1550 nm. Strong coupling of the waveguide modes to the plasmonic eigenmodes of the double cut-wire is achieved via the longitudinal component of the electric field, being relatively large for an asymmetric refractive index profile. By tuning the length of the double cut-wires, we can tune the spectral position of the occurring hybrid resonance. We will show by rigorous calculations, that the resonance is anti-symmetric and hence produces artificial magnetism at optical frequencies in this simple scheme. To further explore the physics of the system, we investigate the dispersion relation of a periodic array of double cut-wires with varying lattice periods. The slab waveguide mode leads to a coupling of the individual plasmonic nanostructures. We find that for short lattice periods the dispersion closely resembles that of the slab waveguide. However when the Bragg frequency approaches the plasmonic resonanee frequency, a. strong interaction takes place and leads to a back-bending of the dispersion relation with regions of negative group velocity near to the band edge while an avoided crossing of both resonances takes place.
机译：超材料有望在纳米密封圈上调整光的传播特性。通过这项贡献，我们探索了将超材料的概念与集成光学相结合的可能性。我们研究了一个由一维双切线阵列（由电介质垫片隔开的两个非常薄的金片）的一维阵列组成的系统，该系统放置在电介质平板波导的顶部，该阵列仅支持基本的TE和TM模式1550 nm附近的红外光谱区域。波导模式与双切线的等离子体本征模式的强耦合是通过电场的纵向分量实现的，对于不对称的折射率分布，该纵向分量相对较大。通过调整双切线的长度，我们可以调整发生的混合共振的频谱位置。我们将通过严格的计算表明，该谐振是反对称的，因此在此简单方案中在光频率下会产生人工磁。为了进一步探索系统的物理特性，我们研究了具有不同晶格周期的双切线周期性阵列的色散关系。平板波导模式导致各个等离子体纳米结构的耦合。我们发现，对于短晶格周期，色散与平板波导的色散非常相似。但是，当布拉格频率接近等离振子共振频率时，a。强烈的相互作用会发生，并导致色散关系与接近带边缘的负群速度区域反向弯曲，同时避免了两个共振的交叉。

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  • 来源
    《Metamaterials: Fundamentals and applications IV》|2011年|p.809322.1-809322.6|共6页
  • 会议地点 San Diego CA(US)
  • 作者

    Thomas Kaiser; Christian Helgert; Thomas Paul; Shakeeb Bin Hasan; Falk Lederer; Carsten Rockstuhl; Thomas Pertseh;

  • 作者单位

    Institute of Applied Physics, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany;

    Institute of Applied Physics, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany;

    Institute of Condensed Matter Theory and Solid State Optics, Friedrieh-Sehiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany;

    Institute of Condensed Matter Theory and Solid State Optics, Friedrieh-Sehiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany;

    Institute of Applied Physics, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany;

    Institute of Condensed Matter Theory and Solid State Optics, Friedrieh-Sehiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany;

    Institute of Applied Physics, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena, Germany;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 材料;
  • 关键词

    metamaterials; nanostructured waveguides; plasmonic nanostructures; resonant interaction;

    机译：超材料纳米结构波导；等离子体纳米结构共振相互作用;

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