Hyperbolic Metamaterials via Hierarchical Block Copolymer Nanostructures
Hyperbolic Metamaterials via Hierarchical Block Copolymer Nanostructures
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DOI：
10.1002/adom.202001933
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发表时间：
2021-02-08
影响因子：
9
通讯作者：
Ferrarese Lupi, Federico
中科院分区：
文献类型：
--
作者：
Murataj, Irdi;Channab, Marwan;Ferrarese Lupi, Federico
双曲型超材料（Hyperbolic Metamaterials，简称HAMTS）在光学领域提供了非传统的特性，使光在纳米尺度上的限制和传播成为可能。光轴的面内取向，在与各向异性的阻碍一致的方向上，是纳米光子学和成像中的各种新的应用所期望的。本文介绍了一种基于嵌段共聚物（BCP）共混物不稳定性的面内光轴局域化全息图的制作方法。BCP薄膜在形貌限定的基底上的去湿产生由高度有序的层状纳米结构以分级配置组成的液滴。分级纳米结构代表了用于随后图案转移到Au/空气HMM中的有价值的平台，在可见光谱中的宽波长范围内表现出双曲线行为。在580 nm处计算的高达32的珀塞尔因子支持放置在HMM顶部的纳米金刚石中的缺陷的荧光寿命的强烈减少。
Hyperbolic metamaterials (HMMs) offer unconventional properties in the field of optics, enabling opportunities for confinement and propagation of light at the nanoscale. In-plane orientation of the optical axis, in the direction coinciding with the anisotropy of the HMMs, is desirable for a variety of novel applications in nanophotonics and imaging. Here, a method for creating localized HMMs with in-plane optical axis, based on block copolymer (BCP) blend instability, is introduced. The dewetting of BCP thin film over topographically defined substrates generates droplets composed of highly ordered lamellar nanostructures in hierarchical configuration. The hierarchical nanostructures represent a valuable platform for the subsequent pattern transfer into a Au/air HMM, exhibiting hyperbolic behavior in a broad wavelength range in the visible spectrum. A computed Purcell factor as high as 32 at 580 nm supports the strong reduction in the fluorescence lifetime of defects in nanodiamonds placed on top of the HMM.