Induced Chirality through Electromagnetic Coupling between Chiral Molecular Layers and Plasmonic Nanostructures
Induced Chirality through Electromagnetic Coupling between Chiral Molecular Layers and Plasmonic Nanostructures
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DOI：
10.1021/nl204055r
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发表时间：
2012-02-01
期刊：
影响因子：
10.8
通讯作者：
Kadodwala, Malcolm
中科院分区：
文献类型：
--
作者：
Abdulrahman, Nadia A.;Fan, Z.;Kadodwala, Malcolm
我们报道了一种制备手性等离子体纳米材料的新方法。利用了以前未曾考虑过的远场机制，该机制使得手性能够从周围的手性分子材料传递到非手性金属纳米结构的等离子体共振。我们的观察打破了目前持有的一种偏见，即分子材料可以通过近场效应最有效地操纵等离子体粒子的光学性质。我们发现，非手性纳米结构的局域等离子体激元与周围手性分子层之间的远场电磁耦合可以比以前报道的近场现象更有效地诱导等离子体手性(约为10(3)倍)。通过将我们的实验结果与一个简单的电磁模型进行比较，我们深入了解了这一机制，该模型包含一个等离子体对象和一个手性分子介质。我们的工作为杂化分子等离子体纳米材料的制备提供了一个新的方向，这些纳米材料在可见光区显示出显著的手性。
We report a new approach for creating chiral plasmonic nanomaterials. A previously unconsidered, far-field mechanism is utilized which enables chirality to be conveyed from a surrounding chiral molecular material to a plasmonic resonance of an achiral metallic nanostructure. Our observations break a currently held preconception that optical properties of plasmonic particles can most effectively be manipulated by molecular materials through near-field effects. We show that far-field electromagnetic coupling between a localized plasmon of a nonchiral nanostructure and a surrounding chiral molecular layer can induce plasmonic chirality much more effectively (by a factor of 10(3)) than previously reported near-field phenomena. We gain insight into the mechanism by comparing our experimental results to a simple electromagnetic model which incorporates a plasmonic object coupled with a chiral molecular medium. Our work offers a new direction for the creation of hybrid molecular plasmonic nanomaterials that display significant chiroptical properties in the visible spectral region.