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Plasmonic gold helices for the visible range fabricated by oxygen plasma purification of electron beam induced deposits

机译：通过电子束诱导沉积物的氧等离子体净化制造的可见范围的等离子体金螺旋

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摘要

Electron beam induced deposition (EBID) currently provides the only direct writing technique for truly three-dimensional nanostructures with geometrical features below 50 nm. Unfortunately, the depositions from metal-organic precursors suffer from a substantial carbon content. This hinders many applications, especially in plasmonics where the metallic nature of the geometric surfaces is mandatory. To overcome this problem a post-deposition treatment with oxygen plasma at room temperature was investigated for the purification of gold containing EBID structures. Upon plasma treatment, the structures experience a shrinkage in diameter of about 18 nm but entirely keep their initial shape. The proposed purification step results in a core-shell structure with the core consisting of mainly unaffected EBID material and a gold shell of about 20 nm in thickness. These purified structures are plasmonically active in the visible wavelength range as shown by dark field optical microscopy on helical nanostructures. Most notably, electromagnetic modeling of the corresponding scattering spectra verified that the thickness and quality of the resulting gold shell ensures an optical response equal to that of pure gold nanostructures.
机译：电子束诱导的沉积（EBID）目前为真正的三维纳米结构提供了唯一的直接写入技术，具有低于50 nm以下的几何特征。不幸的是，金属 - 有机前体的沉积患有大量碳含量。这阻碍了许多应用，尤其是在血浆中，其中几何表面的金属性质是强制性的。为了克服该问题，研究了室温下与氧等离子体的沉积后处理用于含有EBID结构的金。在等离子体处理时，结构的直径约为18nm的收缩，但完全保持初始形状。所提出的纯化步骤导致核心壳结构，该核心壳结构主要由未受影响的EBID材料和厚度约20nm的金壳组成。这些纯化的结构在可见波长范围内等相活性，如螺旋纳米结构上的暗场光学显微镜所示。最值得注意的是，相应散射光谱的电磁建模验证了所得金壳的厚度和质量确保了等于纯金纳结构的光学响应。

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  • 来源
    《Nanotechnology》 |2017年第5期|共8页
  • 作者

    Haverkamp Caspar; Hoeflich Katja; Jaeckle Sara; Manzoni Anna; Christiansen Silke;

  • 作者单位

    Helmholtz Zentrum Berlin Mat &

    Energie GmbH Hahn Meitner Pl 1 D-14109 Berlin Germany;

    Helmholtz Zentrum Berlin Mat &

    Energie GmbH Hahn Meitner Pl 1 D-14109 Berlin Germany;

    Helmholtz Zentrum Berlin Mat &

    Energie GmbH Hahn Meitner Pl 1 D-14109 Berlin Germany;

    Helmholtz Zentrum Berlin Mat &

    Energie GmbH Hahn Meitner Pl 1 D-14109 Berlin Germany;

    Helmholtz Zentrum Berlin Mat &

    Energie GmbH Hahn Meitner Pl 1 D-14109 Berlin Germany;

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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

    plasmonic; chiral; EBID; purification; gold;

    机译：等离子体;手性;EBID;净化;金;

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