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Three - dimensional imaging of localized surface plasmon resonances of metal nanoparticles

机译：金属纳米粒子局部表面等离子体共振的三维成像。

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摘要

The remarkable optical properties of metal nanoparticles are governed by the excitation of localized surface plasmon resonances (LSPRs). The sensitivity of each LSPR mode, whose spatial distribution and resonant energy depend on the nanoparticle structure, composition and environment, has given rise to many potential photonic, optoelectronic, catalytic, photovoltaic, and gas- and bio-sensing applications. However, the precise interplay between the three-dimensional (3D) nanoparticle structure and the LSPRs is not always fully understood and a spectrally sensitive 3D imaging technique is needed to visualize the excitation on the nanometre scale. Here we show that 3D images related to LSPRs of an individual silver nanocube can be reconstructed through the application of electron energy-loss spectrum imaging, mapping the excitation across a range of orientations, with a novel combination of non-negative matrix factorization, compressed sensing and electron tomography. Our results extend the idea of substrate-mediated hybridization of dipolar and quadrupolar modes predicted by theory, simulations, and electron and optical spectroscopy, and provide experimental evidence of higher-energy mode hybridization. This work represents an advance both in the understanding of the optical response of noble-metal nanoparticles and in the probing, analysis and visualization of LSPRs.
机译：金属纳米粒子的卓越光学性能受局部表面等离振子共振（LSPR）激发的支配。每种LSPR模式的灵敏度（其空间分布和共振能量取决于纳米粒子的结构，组成和环境）已经引起了许多潜在的光子，光电，催化，光伏以及气体和生物传感应用。但是，并不总是完全理解三维（3D）纳米粒子结构与LSPR之间的精确相互作用，并且需要光谱敏感的3D成像技术来可视化纳米级的激发。在这里，我们显示了可以通过电子能量损失谱成像的应用重构与单个银纳米立方体的LSPR相关的3D图像，通过一系列非负矩阵分解，压缩感测的新颖组合来绘制一系列取向的激发和电子断层扫描。我们的研究结果扩展了理论，模拟以及电子和光谱学预测的底物介导的偶极和四极模式杂交的思想，并提供了高能模式杂交的实验证据。这项工作代表了对贵金属纳米粒子光学响应的​​理解以及LSPR的探测，分析和可视化方面的进步。

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  • 来源
    《Nature》 |2013年第7469期|80-84|共5页
  • 作者

    Olivia Nicoletti; Francisco de la Pena; Rowan K. Leary; Daniel J. Holland; Catering Ducati; Paul A Midgley;

  • 作者单位

    Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK;

    Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK;

    Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK;

    Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, UK;

    Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK;

    Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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