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arXiv 0901.1310physics.opticsphysics.class-ph
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平面非手征等离子体超材料的圆二色性

Circular dichroism in planar nonchiral plasmonic metamaterials

Vassilios Yannopapas

摘要:

理论上表明,一个非手性的,二维阵列的金属球表现出旋光性表现在圆二色性的计算。金属球占据了一个矩形晶格的网站和非正常的入射,他们表现出很强的圆二色性的表面等离子体频率周围的效果。旋光性是晶格的矩形对称性的结果,其引起晶体沿着两个正交的原始晶格矢量的不同偏振模式。这两种偏振模式导致净极矢量,其与波矢量和垂直于球平面的矢量形成手征三元组。这种手性三元组的形成是观察到的圆二色性的原因,尽管结构本身本质上是非手性的。

英文摘要:

It is shown theoretically that a nonchiral, two-dimensional array of metallic spheres exhibits optical activity as manifested in calculations of circular dichroism. The metallic spheres occupy the sites of a rectangular lattice and for off-normal incidence they show a strong circular-dichroism effect around the surface plasmon frequencies. The optical activity is a result of the rectangular symmetry of the lattice which gives rise to different polarizations modes of the crystal along the two orthogonal primitive lattice vectors. These two polarization modes result in a net polar vector, which forms a chiral triad with the wavevector and the vector normal to the plane of spheres. The formation of this chiral triad is responsible for the observed circular dichroism, although the structure itself is intrinsically nonchiral.

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