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High-aspect-ratio mushroom-like silica nanopillars immersed in air: epsilon-near-zero metamaterials mediated by a phonon-polaritonic anisotropy

机译:浸入空气中的高纵横比蘑菇状二氧化硅:由声子 - 偏光激素各向异性介导的epsilon - 近零超材料

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摘要

Epsilon-near-zero metamaterials offer opportunities for intriguing electromagnetic-wave phenomena. Here we experimentally demonstrate that silica perpendicular nanopillars immersed in air exhibit a uniaxial epsilon-near-zero response mediated by phonon polaritons in the mid-infrared range. Unique mushroom-shaped heads on nanopillars play a crucial role to realize SiO2 metamaterials over a large area in our self-assembled fabrication process with block copolymers, polystyrene-blockpoly( dimethylsiloxane) (PS-b-PDMS). SiO2 nanopillars having heights of 80 nm, 200 nm, and 300 nm (aspect ratios up to similar to 13) are obtained after calcination at 450 degrees C and the electromagnetic responses are evaluated using a mid-infrared ellipsometric apparatus. For nanopillars with 200 nm height, the permittivity of the perpendicular component 3t approaches to near zero (0.2) while the parallel component 3k shows a value of 1.8. The measured uniaxial epsilon-near-zero responses are excellently reproduced by the effective medium theory. Our results, therefore, indicate that SiO2 nanopillars/ air uniaxial epsilon-near-zero metamaterials in the mid-infrared range can be amenable to large scale fabrication.
机译:epsilon - 近零的超材料提供了有吸引电磁波现象的机会。在这里,我们通过实验证明浸入空气中的二氧化硅垂直纳米粒子表现出由中红外范围内的声子极化子介导的单轴epsilon-ut零响应。在纳米柱独特的蘑菇状的头打过来在我们与嵌段共聚物,聚苯乙烯 - blockpoly(二甲基硅氧烷)(PS-B-PDMS)自组装制造工艺的大面积实现的SiO2超材料至关重要的作用。在450℃的煅烧之后,获得具有80nm,200nm和300nm的高度为80nm,200nm和300nm的高度的SiO2纳米粒子(高达相对于13),并且使用中红外椭圆训练装置评估电磁响应。对于具有200nm高度的纳米玻璃,垂直部件3T接近零(0.2)的介电常数,而平行分量3K表示1.8的值。测量的单轴epsilon - 近零响应由有效的媒介理论出于极好地再现。因此,我们的结果表明中红外范围内的SiO2纳米铝镁/空气单轴ε-近零超材料可用于大规模制造。

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  • 来源
    《RSC Advances》 |2019年第29期|共8页
  • 作者单位

    Toyota Cent Res &

    Dev Labs Inc 41-1 Yokomichi Nagakute Aichi 4801192 Japan;

    Toyota Cent Res &

    Dev Labs Inc 41-1 Yokomichi Nagakute Aichi 4801192 Japan;

    Toyota Cent Res &

    Dev Labs Inc 41-1 Yokomichi Nagakute Aichi 4801192 Japan;

    Toyota Motor North Amer Toyota Res Inst North Amer 2205 Commonwealth Blvd Ann Arbor MI 48105 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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