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Extreme optical chirality of plasmonic nanohole arrays due to chiral Fano resonance

机译：由于手性法诺共振，等离子体纳米孔阵列具有极高的光学手性

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摘要

We study the physical origin of extreme optical chirality of subwavelength arrays of chiral holes in metal. We reconstruct the nanoscale relief of the hole arrays by the atomic-force microscopy and post-process the data to acquire an average unit-cell shape clear of noise and defects. For this shape, we perform the electromagnetic finite difference time domain simulations that reproduce all important features observed by the light-transmission experiments, including the notably strong circular dichroism and optical activity covering the whole range of possible values. To interpret the simulation results, we develop a chiral coupled-mode model which yields analytical expressions that fit accurately the numerical data in a broad wavelength range. Our conclusions undoubtedly link the extreme optical chirality to the plasmon resonances of chiral holes and the associated chiral Fano-type transmission resonance.
机译：我们研究了金属中手性孔的亚波长阵列的极端光学手性的物理起源。我们通过原子力显微镜重建孔阵列的纳米级浮雕，并对数据进行后处理，以获取没有噪声和缺陷的平均晶胞形状。对于这种形状，我们执行电磁有限时域仿真，该仿真再现了通过光传输实验观察到的所有重要特征，包括特别强的圆二色性和覆盖整个可能值范围的光学活性。为了解释仿真结果，我们开发了一种手性耦合模式模型，该模型产生的解析表达式可以精确地拟合宽波长范围内的数值数据。我们的结论无疑将极端的光学手性与手性孔的等离振子共振以及相关的手性Fano型传输共振联系起来。

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  • 来源
    《Physical review》 |2016年第19期|195418.1-195418.10|共10页
  • 作者

    A. V. Kondratov; M. V. Gorkunov; A. N. Darinskii; R. V. Gainutdinov; O. Y. Rogov; A. A. Ezhov; V. V. Artemov;

  • 作者单位

    Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 119333 Moscow, Russia;

    Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 119333 Moscow, Russia,National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia;

    Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 119333 Moscow, Russia;

    Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 119333 Moscow, Russia;

    Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 119333 Moscow, Russia;

    Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 119333 Moscow, Russia,Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia;

    Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 119333 Moscow, Russia;

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