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Plasmonics without negative dielectrics

机译：无负电介质的等离子

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摘要

Plasmonic phenomena are exhibited in light-matter interaction involving materials whose real parts of permittivity functions attain negative values at operating wavelengths. However, such materials usually suffer from dissipative losses, thus limiting the performance of plasmon-based optical devices. Here, we utilize an alternative methodology that mimics a variety of plasmonic phenomena by exploiting the well-known structural dispersion of electromagnetic modes in bounded guided-wave structures filled with only materials with positive permittivity. A key issue in the design of such structures is prevention of mode coupling, which can be achieved by implementing thin metallic wires at proper interfaces. This method, which is more suitable for lower frequencies, allows designers to employ conventional dielectrics and highly conductive metals for which the loss is low at these frequencies, while achieving plasmonic features. We demonstrate, numerically and analytically, that this platform can provide surface plasmon polaritons, local plasmonic resonance, plasmonic cloaking, and epsilon-near-zero-based tunneling using conventional positive-dielectric materials.
机译：在涉及材料的光-物质相互作用中表现出等离子现象，其材料的介电常数函数的实部在工作波长下达到负值。然而，此类材料通常遭受耗散损耗，从而限制了基于等离激元的光学装置的性能。在这里，我们利用一种替代方法，该方法通过利用众所周知的电磁波在仅填充有正介电常数材料的有界波导结构中的结构分散来模拟各种等离子体现象。这种结构设计中的关键问题是防止模式耦合，这可以通过在适当的界面处实现细金属线来实现。这种方法更适合于较低的频率，允许设计人员使用常规的电介质和高导电性金属，这些金属在这些频率下的损耗较低，同时实现了等离子体特性。我们通过数值和分析证明，该平台可以使用常规的正介电材料提供表面等离激元极化子，局部等离激元共振，等离激元掩盖和基于ε-近零的隧穿。

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  • 来源
    《Physical review》 |2016年第19期|195152.1-195152.8|共8页
  • 作者

    Cristian Delia Giovampaola; Nader Engheta;

  • 作者单位

    University of Pennsylvania, Department of Electrical and Systems Engineering, Philadelphia, Pennsylvania 19104, USA;

    University of Pennsylvania, Department of Electrical and Systems Engineering, Philadelphia, Pennsylvania 19104, USA;

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