Enantiomer‐Selective Molecular Sensing in the Nonlinear Optical Regime via Upconverting Chiral Metamaterials
Enantiomer‐Selective Molecular Sensing in the Nonlinear Optical Regime via Upconverting Chiral Metamaterials
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DOI：
10.1002/adfm.202208641
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发表时间：
2022-08
影响因子：
19
通讯作者：
Kyu-Tae Lee;B. Kim;L. Raju;S. Rodrigues;Doo‐Hyun Ko;W. Cai
中科院分区：
文献类型：
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作者：
Kyu-Tae Lee;B. Kim;L. Raju;S. Rodrigues;Doo‐Hyun Ko;W. Cai
对映异构体是手性异构体，其中异构体的结构本身及其镜像不能彼此叠加。对映异构体选择性传感是至关重要的，因为对映异构体对其镜像表现出不同的功能。通过光学方法区分对映异构体已被广泛使用，因为这些技术提供了非破坏性表征，然而，它们受到分子固有的小手性的限制。在这里，一种方法，以有效地区分手性分析物的非线性制度的证明，这是促进了上转换手性等离子体超材料。手性分子的不同手性与手性超材料平台相互作用，这导致近红外区域中手性超材料的圆二色性的变化。圆二色性的对比度由可见光区域中的上转换信号来识别。
Enantiomers are chiral isomers in which the isomer's structure itself and its mirror image cannot be superimposed on each other. Enantiomer selective sensing is critical as enantiomers exhibit distinct functionalities to their mirror image. Discriminating between enantiomers by optical methods has been widely used as these techniques provide nondestructive characterization, however, they are constrained by the intrinsically small chirality of the molecules. Here, a method to effectively discriminate chiral analytes in the nonlinear regime is demonstrated, which is facilitated by an upconverting chiral plasmonic metamaterial. The different handedness of the chiral molecules interacts with the chiral metamaterial platform, which leads to a change in the circular dichroism of the chiral metamaterial in the near‐infrared region. The contrast of the circular dichroism is identified by the upconverted signal in the visible region.