Uniform Chiral Near‐Fields in Achiral Nanocavity Induced by Magnetic Polaritons Mode
Uniform Chiral Near‐Fields in Achiral Nanocavity Induced by Magnetic Polaritons Mode
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DOI：
10.1002/andp.202100353
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发表时间：
2021-12
影响因子：
2.4
通讯作者：
Yu Bai;A. Abudukelimu;Ziyan Zhang;Hamad Ullah;Ying Li;Yongkai Wang;Zhongyue Zhang
中科院分区：
文献类型：
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作者：
Yu Bai;A. Abudukelimu;Ziyan Zhang;Hamad Ullah;Ying Li;Yongkai Wang;Zhongyue Zhang
手性近场在手性分子分析、圆偏振发光和传感中至关重要。在圆偏振光照射下，左手和右手手性近场发生在纳米结构周围。然而，大多数以前报道的作品需要基于不对称的3D纳米结构的结构手性。通常，左右手征近场在空间上很难分离，导致应用效率低下。这里，提出了非手性U形凹槽纳米结构阵列，以在圆偏振光照射下产生均匀的手性近场。与垂直平行板纳米结构相比，在两个垂直平行板下方添加底层以设计诱导磁极化子模式的U形凹槽纳米结构。在非手性U形槽纳米结构的腔中，通过具有平行分量的电和磁近场的激发来诱导手性近场。这些手性近场强烈依赖于U形凹槽纳米结构的结构参数。此外，手性分子被引入到U形凹槽纳米结构的空腔中，以利用其作为手性分子检测的传感器。数值结果表明，分子的圆二色性得到了显著增强。这些发现为新的手性光学应用程序的实际和可扩展的平台的发展铺平了道路。
Chiral near‐fields are crucial in the analysis of chiral molecules, circularly polarized luminescence, and sensing. Under circularly polarized light illumination, left‐ and right‐handed chiral near‐fields occur around nanostructures. However, most previously reported works require structural chirality based on asymmetric 3D nanostructures. Usually, left‐ and right‐handed chiral near‐fields are difficult to separate in space, leading to low efficiency in applications. Here, achiral U‐shaped groove nanostructure arrays are proposed to generate uniform chiral near‐fields under circularly polarized light illumination. In contrast to vertical parallel plate nanostructures, a bottom layer is added below the two vertical parallel plates to design U‐shaped groove nanostructures that induce magnetic polaritons mode. In the cavity of the achiral U‐shaped groove nanostructure, chiral near‐field is induced by the excitation of electric and magnetic near‐fields with parallel components. These chiral near‐fields strongly depend on the structural parameters of the U‐shaped groove nanostructure. In addition, chiral molecules are introduced into the cavity of the U‐shaped groove nanostructure to utilize it as sensors for chiral molecular detection. Numerical results show that the circular dichroism of the molecules is enhanced remarkably. These findings pave the way toward the development of practical and scalable platforms for new chiroptical applications.