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Role of higher order plasmonic modes in one-dimensional nanogratings

机译：高阶等离子体模式在一维纳米光栅中的作用

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摘要

By theoretically investigating the optical behavior of one-dimensional gold nanogratings using Fourier Modal Method, we have shown that both integer and non-integer multiples of surface plasmon polariton wavelengths should be taken into consideration in special optical contrast ratio for highly sensitive sensing. The emergence of higher modes is the key factor for the formation of observed plasmonic band gap. Through considering the significant role of grating period and thickness respectively in horizontal and vertical surface resonances, it was demonstrated that for gold thicknesses below 100nm, the dominant phenomenon is horizontal surface resonances while for increased thicknesses both horizontal and vertical surface resonances mediate. The transmission minima are insensitive to the grating thickness, which confirms that their origins are not vertical surface resonances. This study can open an avenue towards designing highly sensitive sensors with focus not only on the plasmonic resonance wavelength but also on its integer and non-integer multiples whose origins should be investigated in both horizontal and vertical surface resonances.
机译：通过使用傅里叶模态方法从理论上研究一维金纳米光栅的光学行为，我们表明，对于高灵敏感测，应在特殊的光学对比度中同时考虑表面等离振子极化子波长的整数倍和非整数倍。更高模式的出现是形成观察到的等离子体带隙的关键因素。通过考虑光栅周期和厚度分别在水平和垂直表面共振中的重要作用，证明了对于厚度小于100nm的金，主要现象是水平表面共振，而对于厚度增加的情况，水平和垂直表面共振均起调节作用。透射最小值对光栅厚度不敏感，这证实了它们的起源不是垂直表面共振。这项研究可以为设计高度灵敏的传感器开辟一条道路，该传感器不仅关注等离子共振波长，而且关注其整数和非整数倍数，其起源应在水平和垂直表面共振中进行研究。

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  • 来源
    《Optical and quantum electronics》 |2019年第7期|241.1-241.10|共10页
  • 作者

    Sohrabi Foozieh; Hamidi Seyedeh Mehri; Mohammadi Ershad;

  • 作者单位

    Shahid Beheshti Univ, Laser & Plasma Res Inst, Magnetoplasmon Lab, Daneshju Blvd, Tehran 1983969411, Iran|Ecole Polytech Fed Lausanne, Bioengn Dept, CH-1015 Lausanne, Switzerland;

    Shahid Beheshti Univ, Laser & Plasma Res Inst, Magnetoplasmon Lab, Daneshju Blvd, Tehran 1983969411, Iran;

    Ecole Polytech Fed Lausanne, Bioengn Dept, CH-1015 Lausanne, Switzerland|Amirkabir Univ Technol, Dept Elect Engn, Tehran, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Grating; Plasmonic crystal; Mode analysis; Fourier modal method; Sensing;

    机译：光栅;等离子体晶体;模式分析;傅立叶模态方法;感应;

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