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arXiv 1409.0180physics.optics
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复势场中的低维光学手征

Low-dimensional optical chirality in complex potentials

Sunkyu Yu, Hyun Sung Park, Xianji Piao, Bumki Min, Namkyoo Park

摘要:

手性是自然界中的普遍特征,如在费米子相互作用和DNA螺旋性中所观察到的。光的手征相互作用受到了广泛的关注,不仅涉及其物理解释,而且还关注激发,吸收,折射和拓扑相位中的有趣现象。虽然超材料的最新进展刺激了手征性的人工工程,但大多数方法都是建立在电磁响应混合的相同原理上。在这里,我们提出了基于低维本征系统的光的手征相互作用。利用复杂材料中放大和衰减电模式的混合,实现了具有手征本征态的偏振空间中的低维性,与先前方法中的2维本征系统相反。从低维手征性预言了光学自旋黑洞的存在,并在实验上证实了宇称时间对称异向介质中手征波之间的奇异相互作用。

英文摘要:

Chirality is a universal feature in nature, as observed in fermion interactions and DNA helicity. Much attention has been given to chiral interactions of light, not only regarding its physical interpretation but also focusing on intriguing phenomena in excitation, absorption, refraction, and topological phase. Although recent progress in metamaterials has spurred artificial engineering of chirality, most approaches are founded on the same principle of the mixing of electric and magnetic responses. Here we propose nonmagnetic chiral interactions of light based on low-dimensional eigensystems. Exploiting the mixing of amplifying and decaying electric modes in a complex material, the low-dimensionality in polarization space having a chiral eigenstate is realized, in contrast to 2-dimensional eigensystems in previous approaches. The existence of optical spin black hole from low-dimensional chirality is predicted, and singular interactions between chiral waves are confirmed experimentally in parity-time-symmetric metamaterials.

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