螺旋面
纳米光子学
材料科学
拉曼光学活性
拉曼光谱
拉曼散射
对映体
纳米颗粒
纳米技术
光学
物理
化学
有机化学
几何学
数学
作者
Martin Kartau,Anastasia Skvortsova,Victor Tabouillot,Shailendra K. Chaubey,Polina Bainova,Rahul Kumar,Vasilii Burtsev,Václav Švorčı́k,Nikolaj Gadegaard,Sang Won Im,Marie Urbanová,Oleksiy Lyutakov,Malcolm Kadodwala,Affar S. Karimullah
标识
DOI:10.1002/adom.202202991
摘要
Chiral nanophotonic platforms provide a means of creating near fields with both enhanced asymmetric properties and intensities. They can be exploited for optical measurements that allow enantiomeric discrimination at detection levels greater than 6 orders of magnitude than is achieved with conventional chirally sensitive spectroscopic methods based on circularly polarized light. The optimal approach for exploiting nanophotonic platforms for chiral detection would be to use spectroscopic methods that provide a local probe of changes in the near field environment induced by the presence of chiral species. Here we show that surface enhanced Raman spectroscopy (SERS) is such a local probe of the near field environment. We have used it to achieve enantiomeric discrimination of chiral helicoid nanoparticles deposited on left and right-handed enantiomorphs of a chiral metafilm. Hotter electromagnetic hotspots are created for matched combinations of helicoid and metafilms (left-left and right-right), while mismatched combinations leads to significantly cooler electromagnetic hotspots. This large enantiomeric dependency on hotspot intensity is readily detected using SERS with the aid of an achiral Raman reporter molecule. In effect we have used SERS to distinguish between the different EM environments of the plasmonic diastereomers produced by mixing chiral nanoparticles and metafilms. The work demonstrates that by combining chiral nanophotonic platforms with established SERS strategies new avenues in ultrasensitive chiral detection can be opened.
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