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Dielectric-loading approach for extra electric field enhancement and spatially transferring plasmonic hot-spots

机译：额外电场增强和空间转移等离子体热点的介电加载方法

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摘要

Plasmonic nanoantennas have been widely explored for boosting up light-matter interactions due to their ability of providing strongly confined and highly enhanced electric near fields, so called 'hot-spots'. Here, we propose a dielectric-loading approach for hot-spots engineering by coating the conventional plasmonic nanoantennas with a conformal high refractive index dielectric film and forming dielectric-loaded plasmonic nanoantennas. Compared to the conventional plasmonic nanoantennas, the corresponding dielectric-loaded ones that resonate at the same frequency are able to provide an extra enhancement in the local electric fields and meanwhile spatially transfer the hot spots to the dielectric surfaces. These findings have important implications for the design of optical nanoantennas with general applications in surface enhanced linear and nonlinear spectroscopies. As a demonstration application, we show that the maximum achievable fluorescence intensity in the dielectric-loaded plasmonic nanoantennas could be significantly larger than that in the conventional plasmonic nanoantennas.
机译：等离子体纳米天线由于能够提供强约束和高增强的近场，即所谓的“热点”，而被广泛用于增强光与物质的相互作用。在这里，我们提出了一种用于热点工程的介质加载方法，即用共形高折射率介质膜覆盖传统的等离子体纳米天线，并形成介质加载的等离子体纳米天线。与传统的等离子体纳米天线相比，以相同频率谐振的相应介质加载天线能够在局部电场中提供额外的增强，同时在空间上将热点转移到介质表面。这些发现对光学纳米天线的设计具有重要意义，这些天线一般应用于表面增强线性和非线性光谱。作为一个演示应用，我们表明，在介质加载的等离子体纳米天线中可实现的最大荧光强度可能比传统的等离子体纳米天线中的荧光强度大得多。

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  • 来源
    《Nanotechnology》 |2021年第3期|共9页
  • 作者

    Wan Mingjie; Wu Jingyu; Liu Jun; Chen Zhuo; Gu Ping; Zhan Peng; Wang Zhenlin; Bozhevolnyi Sergey I;

  • 作者单位

    Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

    Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

    Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

    Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

    Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

    Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

    Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China;

    Univ Southern Denmark Ctr Nano Opt Campusvej 55 DK-5230 Odense M Denmark;

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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

    nanoantenna design; hot-spot engineering; extra fluorescence enhancement;

    机译：纳米天线设计;热点工程;额外荧光增强;

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