Planar, thin-layered chiral plasmonic superstructures with complex two-dimensional (2D) patterns, namely, double-layered binary stars (bi-stars) and pinwheels, were realized through DNA programmable 2D supramolecular self-assembly of gold nanorods (AuNRs). The chirality of the chiral superstructures was defined by a finite number of AuNR pairs as enantiomeric motifs, and their sizes (∼240 nm) were precisely defined by the underlying DNA template. These planar, thin-layered chiral nanoparticle superstructures exhibited prescribed shapes and sizes at the dried state on the substrate surface and are characteristic of giant anisotropy of chiroptical responses, with enhanced g-factors from the axial incident excitation as compared to the in-plane excitation. This work will inspire possibilities for the construction of 2D chiral materials, for example, chiral metasurfaces, for the on-chip manipulation of chiral light-matter interactions via programmable self-assembly of nanoparticles.

中文翻译：

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具有复杂二维图案的平面、薄层手性纳米颗粒超结构的 DNA 可编程自组装

具有复杂二维（2D）图案的平面薄层手性等离子体超结构，即双层双星（双星）和风车，是通过金纳米棒（AuNRs）的DNA可编程二维超分子自组装实现的。手性超结构的手性由有限数量的 AuNR 对定义为对映体基序，它们的大小（~240 nm）由潜在的 DNA 模板精确定义。这些平面的、薄层的手性纳米颗粒超结构在基底表面的干燥状态下表现出规定的形状和尺寸，并且具有巨大的手性响应各向异性的特征，具有增强的g- 与平面内激发相比，来自轴向入射激发的因素。这项工作将激发构建二维手性材料的可能性，例如手性超表面，通过纳米颗粒的可编程自组装在芯片上操纵手性光-物质相互作用。