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Nanocone-based plasmonic metamaterials

机译：基于纳米核苷酸的等级性超材料

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摘要

Metamaterials and metasurfaces provide unprecedented opportunities for designing light-matter interactions. Optical properties of hyperbolic metamaterials with meta-atoms based on plasmonic nanorods, important in nonlinear optics, sensing and spontaneous emission control, can be tuned by varying geometrical sizes and arrangement of the meta-atoms. At the same time the role of the shape of the meta-atoms forming the array has not been studied. We present the fabrication and optical characterization of metamaterials based on arrays of plasmonic nanocones closely packed at the subwavelength scale. The plasmonic mode structure of the individual nanocones and pronounced coupling effects between them provide multiple degrees of freedom to engineer both the field enhancement and the optical properties of the resulting metamaterials. The metamaterials are fabricated using a scalable manufacturing procedure, allowing mass- production at the centimeter scale. The ultra-sharp cone apex(less than or similar to 2 nm) and the associated field enhancement provide an extremely high density of electromagnetic hot-spots (similar to 10(10)cm(-2)). These properties of nanocone-based metamaterials are important for the development of gradient-index metamaterials and in numerous applications in fluorescence enhancement, surface enhanced Raman spectroscopy as well as hot-carrier plasmonics and photocatalysis.
机译：超材料和Metasurfaces提供了前所未有的设计灯具互动的机会。基于等离子体纳米棒的元柱具有间质的双曲面材料的光学性质可以通过不同的几何尺寸和元原子的布置来调节非线性光学，感测和自发排放控制的重要性。同时尚未研究形成阵列的元原子的形状的作用。我们介绍了基于在亚波长尺度紧密包装的等离子体纳米阵列阵列的超材料的制造和光学表征。各个纳米能源的等离子体模式结构和它们之间的明显耦合效应提供了多项自由度来工程工程师的现场增强和所得的超材料的光学性质。使用可扩展的制造程序制造超材料，允许厘米级的大规模生产。超尖锥顶点（小于或类似于2nm）和相关的现场增强提供了极高的电磁热点密度（类似于10（10 )cm（-2））。基于纳米核苷酸的超材料的这些性质对于梯度指数超材料和许多应用中的荧光增强，表面增强拉曼光谱以及热载量和光催化的许多应用都很重要。

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