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arXiv 1609.07653physics.optics
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各向异性平面微腔中的例外点

Exceptional points in anisotropic planar microcavities

Steffen Richter, Tom Michalsky, Chris Sturm, Bernd Rosenow, Marius Grundmann, Rüdiger Schmidt-Grund

摘要:

平面微腔允许控制和操纵自旋极化,表现在由于固有极化模式分裂而引起的光学自旋霍尔效应等现象中。在这里,我们研究了一个透明的旋转对称性破缺的微腔,实现了在腔平面的单轴腔材料的光轴对齐。我们表明,在平面内的光学各向异性引起的例外点的色散关系,这发生成对的,圆偏振,是偏振涡旋的核心。这些例外点是系统的非厄米特特性的结果,并且与吸收双轴系统中的奇异光轴密切相关。

英文摘要:

Planar microcavities allow the control and manipulation of spin-polarization, manifested in phenomena like the optical spin Hall effect due to the intrinsic polarization mode splitting. Here, we study a transparent microcavity with broken rotational symmetry, realized by aligning the optical axis of a uniaxial cavity material in the cavity plane. We demonstrate that the in-plane optical anisotropy gives rise to exceptional points in the dispersion relation, which occur pair-wise, are circularly polarized, and are cores of polarization vortices. These exceptional points are a result of the non-Hermitian character of the system, and are in close relationship to singular optical axes in absorptive biaxial systems.

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