Hyperbolic Metamaterials via Hierarchical Block Copolymer Nanostructures,Advanced Optical Materials

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Hyperbolic Metamaterials via Hierarchical Block Copolymer Nanostructures
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-02-08 , DOI: 10.1002/adom.202001933
Irdi Murataj _{1,

2} , Marwan Channab _{1,

2} , Eleonora Cara ₁ , Candido F. Pirri ₂ , Luca Boarino ₁ , Angelo Angelini ₁ , Federico Ferrarese Lupi ₁

Affiliation

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.

中文翻译：

通过双级嵌段共聚物纳米结构的双曲超材料

双曲线超材料（HMM）在光学领域提供非常规的特性，从而为纳米级光的局限和传播提供了机会。对于纳米光子学和成像中的各种新颖应用，光轴的面内取向（与HMM的各向异性一致）是理想的。在此，介绍了一种基于嵌段共聚物（BCP）共混不稳定性创建具有面内光轴的局部HMM的方法。BCP薄膜在地形定义的基材上的去湿作用会产生由分层结构的高度有序的层状纳米结构组成的液滴。分层的纳米结构代表了一个有价值的平台，可用于随后的图案转移到Au /空气HMM中，在可见光谱的宽波长范围内表现出双曲线行为。

更新日期：2021-04-06

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