Objects of Maximum Electromagnetic Chirality
Objects of Maximum Electromagnetic Chirality
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DOI：
10.1103/physrevx.6.031013
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发表时间：
2016-07-28
影响因子：
12.5
通讯作者：
Rockstuhl, Carsten
中科院分区：
文献类型：
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作者：
Fernandez-Corbaton, Ivan;Fruhnert, Martin;Rockstuhl, Carsten
我们引入了物体电磁手性的定义，并证明了它有一个上界。互易物体达到上界当且仅当它们对一个极化手性（螺旋度）的所有场都是透明的。此外，电磁对偶对称性，即相互作用时的螺旋度保持，是互易物体达到上界的必要条件。我们利用这些结果为这种极端物体的设计提供要求。这些要求可以表示为对偶极物体的极化张量或对连续介质的材料本构关系的约束。我们还概述了两种最大电磁手性物体的应用：双重共振增强和无背景的圆二色性测量装置，以及不依赖角度的螺旋过滤玻璃。最后，我们利用理论得到的要求来指导特定结构的设计，然后对其进行数值分析，并讨论了其在最大电磁手性方面的性能。
We introduce a definition of the electromagnetic chirality of an object and show that it has an upper bound. Reciprocal objects attain the upper bound if and only if they are transparent for all the fields of one polarization handedness (helicity). Additionally, electromagnetic duality symmetry, i.e., helicity preservation upon interaction, turns out to be a necessary condition for reciprocal objects to attain the upper bound. We use these results to provide requirements for the design of such extremal objects. The requirements can be formulated as constraints on the polarizability tensors for dipolar objects or on the material constitutive relations for continuous media. We also outline two applications for objects of maximum electromagnetic chirality: a twofold resonantly enhanced and background-free circular dichroism measurement setup, and angle-independent helicity filtering glasses. Finally, we use the theoretically obtained requirements to guide the design of a specific structure, which we then analyze numerically and discuss its performance with respect to maximal electromagnetic chirality.