论文标题
局部与散装圆形二分色素通过Achiral All-Dielectric纳米声源增强
Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators
论文作者
论文摘要
高度高指数介电纳米结构附近的大型光学手性最近被证明是增强分子圆形二分法的有用手段。从理论上讲，我们研究了高索引介电纳米刺激附近光学手性增强的空间依赖性，并强调了其对纳米光子平台设计的重要性，以增强循环二色性。使用T-Matrix框架，我们证明，取决于磁盘纵横比的手性能优先沿不同的方向增强。我们采用各种统计程序（包括表面，体积和方向平均）是预测脊骨效应的增强所必需的，并表明纳米结构的最佳性质在很大程度上取决于是否寻求空间最大或平均手性增强。同样，纳米结构的最佳选择受底物的存在影响，底物的存在限制了分析物分子所占据的空间，并影响纳米结构附近的光学手性。
Large optical chirality in the vicinity of achiral high index dielectric nanostructures has been recently demonstrated as useful means of enhancing molecular circular dichroism. We theoretically study the spatial dependence of optical chirality enhancement in the vicinity of high index dielectric nanodisks and highlight its importance for the design of nanophotonic platforms for circular dichroism enhancement. Using a T-matrix framework, we demonstrate that depending on disk aspect ratio chirality is enhanced preferentially along different directions. We employ various statistical procedures (including surface, volume and orientation averaging) that are necessary to predict the enhancement of chiroptical effects and show that optimal properties of a nanostructure depend substantially on whether spatial maximum or average chirality enhancement is sought after. Similarly, the optimal choice of the nanostructure is influenced by the presence of substrate, which limits the space available to be occupied by analyte molecules and impacts the optical chirality in the vicinity of the nanostructure.
