Superchiral hot-spots in "real" chiral plasmonic structures
Superchiral hot-spots in "real" chiral plasmonic structures
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DOI：
10.1039/d1ma00831e
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发表时间：
2021-11-02
影响因子：
5
通讯作者：
Kadodwala, M.
中科院分区：
文献类型：
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作者：
Gilroy, C.;Koyroytsaltis-McQuire, D. J. P.;Kadodwala, M.
来自手性等离子体结构的光散射可以产生具有大于等效圆偏振光的不对称性的近场，这种性质有时被称为超手性。这些增强的手性不对称性的近场可以用于超灵敏检测手性（生物）分子。在这个结合实验和数值模拟研究中，我们证明了超手性热点周围的结构异质性，如突起和凹陷，所拥有的所有真实的金属结构。这些超手性热点具有比理想化的完美结构更大的手性不对称性。我们的工作表明，表面形态可以发挥作用，在确定手性结构的传感效率。
Light scattering from chiral plasmonic structures can create near fields with an asymmetry greater than the equivalent circularly polarised light, a property sometimes referred to as superchirality. These near fields with enhanced chiral asymmetries can be exploited for ultrasensitive detection of chiral (bio)molecules. In this combined experimental and numerical modelling study, we demonstrate that superchiral hot-spots are created around structural heterogeneities, such as protrusions and indentations, possessed by all real metal structures. These superchiral hot-spots, have chiral asymmetries greater than what would be expected from an idealised perfect structure. Our work indicates that surface morphology could play a role in determining the efficacy of a chiral structure for sensing.