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Metal-polymer nanocomposite films with ordered vertically-aligned metal cylinders for optical application

机译:具有垂直排列的有序金属圆柱体的金属聚合物纳米复合薄膜,用于光学应用

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Ordered nanostructures of conventional plasmonic metals (Ag, Au etc.) in a dielectric matrix are candidate materials for fabrication of metamaterials. Control over the dimensions of these building blocks offers tunability in the metamaterial design. To that effect we demonstrated the large area fabrication of poly(styrene-b-4-vinyl pyridine) (PS-b-P4VP) diblock copolymer films wherein the self assembly of the PS and P4VP phases creates monodisperse hexagonal cylindrical nanotemplates whose structure can be controlled by varying the molecular weights, layer thicknesses and layer stacking. Silver and gold precursors were infused into the P4VP micro domains and chemically reduced within. We investigated the PS-b-P4VP template film synthesis and successfully obtained micro domain sizes from 30nm to 100nm and template thicknesses up to 700 nm (5 layers) was achieved. The P4VP micro domains were selectively removed by acetic acid etching which was further confirmed by Atomic Force Microscopy (AFM) using the high aspect ratio tips. Using oxygen plasma etching we have shown the effective loading of gold and silver into the P4VP micro domains. Finite Difference Time Domain (FDTD) simulation of a proposed meta-lens with typical material dimensions demonstrates negative refraction and super-resolution imaging.
机译:电介质基质中常规等离激元金属(Ag,Au等)的有序纳米结构是用于制造超材料的候选材料。控制这些构件的尺寸可提供超材料设计的可调整性。为此,我们证明了聚苯乙烯-b-4-乙烯基吡啶(PS-b-P4VP)二嵌段共聚物薄膜的大面积制造,其中PS和P4VP相的自组装产生了单分散的六角形圆柱形纳米模板,其结构可以是通过改变分子量,层厚度和层堆积来控制。将银和金的前体注入到P4VP的微区中,并在其中进行化学还原。我们研究了PS-b-P4VP模板膜的合成,并成功获得了从30nm到100nm的微区尺寸,并且模板厚度达到700 nm(5层)。通过乙酸刻蚀选择性地去除了P4VP的微区,这是通过原子力显微镜(AFM)使用高长宽比尖端进一步证实的。使用氧等离子体蚀刻,我们已经证明了将金和银有效负载到P4VP微区中。拟议的具有典型材料尺寸的元透镜的时差有限差分(FDTD)模拟显示了负折射和超分辨率成像。

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