Nanoimprinted Chiral Plasmonic Substrates with Three-Dimensional Nanostructures,Nano Letters

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Nanoimprinted Chiral Plasmonic Substrates with Three-Dimensional Nanostructures
Nano Letters ( IF 9.6 ) Pub Date : 2018-09-26 00:00:00 , DOI: 10.1021/acs.nanolett.8b03785
Mingliang Zhang , Victor Pacheco-Peña , Yao Yu , Wenxiang Chen , Nicholas J. Greybush , Aaron Stein ₁ , Nader Engheta , Christopher B. Murray , Cherie R. Kagan

Affiliation

We report a large-area fabrication method to prepare chiral substrates patterned with arrays of multilayer, three-dimensional nanostructures using a combination of nanoimprint lithography and glancing angle deposition. Several structures are successfully fabricated using this method, including L-shaped, twisted arc and trilayer twisted Au nanorod structures, demonstrating its generality. As one typical example, arrays of L-shaped nanostructures, consisting of two layers of orthogonally oriented Au nanorods separated by a Ge dielectric layer in the thickness direction, exhibit giant optical chirality in the infrared region with an experimentally achieved g-factor as high as 0.38. Electromagnetic simulations show that the optical chirality results from plasmon hybridization between the two orthogonal Au segments. To demonstrate scalability, a 1 cm² chiral substrate is fabricated with uniform chiral optical property. This method combines both high throughput and precise geometrical control and is therefore promising for applications of chiral metamaterials.

中文翻译：

具有三维纳米结构的纳米压印手性等离子基质

我们报告了一种大面积的制备方法，以准备使用纳米压印光刻和掠射角沉积相结合的多层三维三维结构阵列图案化的手性底物。使用这种方法成功地制造了几种结构，包括L形，弧形和三层扭曲的Au纳米棒结构，证明了其通用性。作为一个典型的例子，L形纳米结构的阵列由两层正交取向的Au纳米棒组成，在厚度方向上被Ge介电层隔开，在红外区域表现出巨大的光学手性，实验获得了g系数高达0.38。电磁仿真表明，光学手性来自两个正交的Au片段之间的等离激元杂交。为了证明可扩展性，制造了具有均匀手性光学性质的1 cm ²手性基质。该方法兼有高通量和精确的几何控制，因此有望用于手性超材料的应用。

更新日期：2018-09-26

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