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Pure magnetic-quadrupole scattering and efficient second-harmonic generation from plasmon-dielectric hybrid nano-antennas

机译：从等离子体介电混合纳米天线的纯磁性四极散射和高效的二次谐波产生

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摘要

We theoretically demonstrate that pure magnetic quadrupole (MQ) scattering is achieved via the excitation of anapole modes and Fano resonance in noble metal (Au or Ag) and high refractive index dielectric (AlGaAs) hybrid nano-antennas. In Au-AlGaAs hybrid nano-antennas, electric anapole and magnetic anapole modes are observed, leading to the suppressions of electric and magnetic dipoles. Introducing gain material to AlGaAs nanodisk to increase the strength of electric quadrupole (EQ) Fano resonance leads to the suppression of EQ scattering. Then, ideal MQ scattering is achieved at the wavelength of total scattering cross-section dip. The increase of signal-to-noise ratio of MQ results in the great enhancement of near-field inside AlGaAs nanodisk. Additionally, the strong MQ resonance exhibits great capability for boosting second-harmonic generation by proper mode matching. These findings achieved in subwavelength geometries have important implications for functional metamaterials and nonlinear photonic nanodevices.
机译：理论上，我们证明了通过在贵金属（Au或Ag）和高折射率电介质（Algaas）混合纳米天线的脂脂模式和扇形共振来实现纯磁性四极（MQ）散射。在Au-Algaas混合纳米天线中，观察到电动砧和磁性砧料模式，导致电磁偶极子的抑制。将增益材料引入Algaas Nanodisk以提高电动四极（EQ）扇形谐振的强度导致抑制EQ散射。然后，在总散射截面倾角的波长下实现理想的MQ散射。 MQ信噪比的增加导致近场内的近场近场的巨大增强。另外，强MQ谐振具有通过适当模式匹配促进二次谐波产生的巨大能力。这些在亚波长几何形状中实现的发现对功能超材料和非线性光子纳米型具有重要意义。

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  • 来源
    《Nanotechnology》 |2019年第26期|共9页
  • 作者

    Pan Gui-Ming; Ma Song; Chen Kai; Zhang Hong; Zhou Li; Hao Zhong-Hua; Wang Qu-Quan;

  • 作者单位

    Wuhan Univ Sch Phys &

    Technol Minist Educ Key Lab Artificial Micro &

    Nanostruct Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Minist Educ Key Lab Artificial Micro &

    Nanostruct Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Minist Educ Key Lab Artificial Micro &

    Nanostruct Wuhan 430072 Hubei Peoples R China;

    China Jiliang Univ Coll Opt &

    Elect Technol Hangzhou 310018 Zhejiang Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Minist Educ Key Lab Artificial Micro &

    Nanostruct Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Minist Educ Key Lab Artificial Micro &

    Nanostruct Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Phys &

    Technol Minist Educ Key Lab Artificial Micro &

    Nanostruct Wuhan 430072 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    magnetic quadrupole scattering; magnetic-anapole mode; fano resonance; second-harmonic generation;

    机译：磁性四极散射;磁性anapole模式;扇形共振;二次谐波产生;

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