Long-Range Plasmon-Assisted Chiral Interactions in Nanocrystal Assemblies
Long-Range Plasmon-Assisted Chiral Interactions in Nanocrystal Assemblies
复制标题
纳米晶体组件中的长程等离子体辅助手性相互作用
DOI：
10.1021/acsphotonics.8b01676
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发表时间：
2019-03-01
期刊：
影响因子：
7
通讯作者：
Govorov, Alexander O.
中科院分区：
文献类型：
--
作者：
Hu, Li;Liedl, Tim;Govorov, Alexander O.
分子识别是大多数生物过程正确运作的关键，它是基于手性实体相互适应的。因此，手性的概念在生物学和生物化学中几乎无处不在。生物分子手性的一种显著的光学表现是圆二色性（CD），这在生物相关系统中是非常典型的。在过去的十年中，生物组装等离子体纳米结构在手性和光响应方面提供了惊人的可能性，并且手性生物等离子体的活跃研究领域最近产生了各种新的传感平台。在分子和纳米尺度系统中，手性的光学表现是由非手性元素之间的复杂相互作用产生的。这种相互作用随着元素之间的距离而迅速衰减，因此，具有强光学手性响应的系统通常是紧密堆积的。在这里，我们展示了如何在前所未有的距离上，在特别设计的等离子体几何中有效地转移手性相互作用。在我们的模型中，两个相距很远的纳米棒（NRs）之间通过传递纳米颗粒（NPs）发生了远程手性相互作用。我们建立了NR-NP-NR配合物的几何形状的特定条件，这种远程手性相互作用应该出现。所提出的手性效应有望在纳米晶体生物组件的实际实验条件下观察到，例如，通过采用所谓的DNA折纸技术。这些及类似的手性生物组装等离子体纳米结构可用于光学生物组装纳米材料领域。
Molecular recognition, which is key to the correct functioning of most biological processes, is based on chiral entities fitting into and onto each other. Consequently, the concept of chirality appears virtually everywhere in biology and biochemistry. One striking optical manifestation of the chirality of biomolecules is circular dichroism (CD), which is very typical for biorelated systems. It has been demonstrated over the past decade that bioassembled plasmonic nanostructures offer amazing possibilities regarding chirality and optical responses, and the active research field of chiral bioplasmonics has recently generated a variety of new sensing platforms. In both molecular and nanoscale systems, optical manifestations of chirality arise from complex interactions between nonchiral elements. Such interactions decay rapidly with the distance between the elements, and therefore, a system with strong optical chiral responses typically is tightly packed. Here we show how to transfer chiral interactions efficiently in specially designed plasmonic geometries over unprecedented distances. In our model, a long-range chiral interaction occurs between two nanorods (NRs) separated by a long distance, via transmitter nanoparticles (NPs). We establish specific conditions for the geometry of the NR-NP-NR complexes where such long-range chiral interactions should appear. The proposed chiral effect is expected to be observable under realistic experimental conditions in nanocrystal bioassemblies, for example, by employing the so-called DNA origami technology. These and similar chiral bioassembled plasmonic nanostructures can be used for applications in the field of optical bioassembled nanomaterials.