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首页> 外文期刊>Chirality: The pharmacological, biological, and chemical consequences of molecular asymmetry >Optical Activity Governed by Local Chiral Structures in Two-Dimensional Curved Metallic Nanostructures
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Optical Activity Governed by Local Chiral Structures in Two-Dimensional Curved Metallic Nanostructures

机译：二维弯曲金属纳米结构中局部手性结构支配的光学活性

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Chiral nanostructures show macroscopic optical activity. Local optical activity and its handedness are not uniform in the nanostructure, and are spatially distributed depending on the shape of the nanostructure. In this study we fabricated curved chain nanostructures made of gold by connecting linearly two or more arc structures in a two-dimensional plane. Spatial features of local optical activity in the chain structures were evaluated with near-field circular dichroism (CD) imaging, and analyzed with the aid of classical electromagnetic simulation. The electromagnetic simulation predicted that local optical activity appears at inflection points where arc structures are connected. The handedness of the local optical activity was dependent on the handedness of the local chirality at the inflection point. Chiral chain structures have odd inflection points and the local optical activity distributed symmetrically with respect to structural centers. In contrast, achiral chain structures have even inflection points and showed antisymmetric distribution. In the near-field CD images of fabricated chain nanostructures, the symmetric and antisymmetric distributions of local CD were observed for chiral and achiral chain structures, respectively, consistent with the simulated results. The handedness of the local optical activity was found to be determined by the handedness of the inflection point, for the fabricated chain structures having two or more inflection points. The local optical activity was thus governed primarily by the local chirality of the inflection points for the gold chain structures. The total effect of all the inflection points in the chain structure is considered to be a predominant factor that determines the macroscopic optical activity. (C) 2016 Wiley Periodicals, Inc.
机译：手性纳米结构显示宏观光学活性。局部光学活性及其手性在纳米结构中不均匀，并且根据纳米结构的形状在空间上分布。在这项研究中，我们通过在二维平面中线性连接两个或多个弧形结构来制造由金制成的弯曲链纳米结构。通过近场圆二色性（CD）成像评估了链结构中局部光学活性的空间特征，并借助经典电磁模拟对其进行了分析。电磁模拟预测局部光学活动出现在连接电弧结构的拐点处。局部光学活性的旋度取决于拐点处的局部手性的旋度。手性链结构具有奇数拐点，并且局部光学活性相对于结构中心对称分布。相反，非手性链结构具有均匀的拐点并显示出反对称分布。在制造的链纳米结构的近场CD图像中，分别观察到手性和非手性链结构的局部CD的对称和反对称分布，与模拟结果一致。对于制造的具有两个或多个拐点的链结构，发现局部光学活性的拐角由拐点的拐角确定。因此，局部光学活性主要受金链结构拐点的局部手性支配。链结构中所有拐点的总作用被认为是决定宏观光学活性的主要因素。 （C）2016威利期刊公司

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