Optical mesh lattices with PT symmetry
Optical mesh lattices with PT symmetry
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DOI：
10.1103/physreva.86.023807
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发表时间：
2012-08-03
影响因子：
2.9
通讯作者：
Christodoulides, Demetrios N.
中科院分区：
文献类型：
--
作者：
Miri, Mohammad-Ali;Regensburger, Alois;Christodoulides, Demetrios N.
我们研究了一类在横向和纵向上都离散化的光学网格周期结构。这些网络由离散耦合的波导阵列组成，而相位元件也被插入以离散地控制其有效电位，并且可以在时间和空间域中实现。它们的带结构和脉冲响应的被动和奇偶时间（PT）对称制度进行了研究。带合并的可能性和例外点的出现，沿着与相关的光学动力学，被认为是详细的以上和以下的PT对称性破缺点。最后，单向不可见PT合成网格晶格也检查，沿着与可能的超光速光传输动力学。
We investigate a class of optical mesh periodic structures that are discretized in both the transverse and longitudinal directions. These networks are composed of waveguide arrays that are discretely coupled, while phase elements are also inserted to discretely control their effective potentials and can be realized both in the temporal and the spatial domain. Their band structure and impulse response are studied in both the passive and parity-time (PT)-symmetric regime. The possibility of band merging and the emergence of exceptional points, along with the associated optical dynamics, are considered in detail both above and below the PT-symmetry breaking point. Finally, unidirectional invisibility in PT-synthetic mesh lattices is also examined, along with possible superluminal light transport dynamics.