Observation of Defect States in PT-Symmetric Optical Lattices
Observation of Defect States in PT-Symmetric Optical Lattices
复制标题
DOI：
10.1103/physrevlett.110.223902
复制
发表时间：
2013-05-29
影响因子：
8.6
通讯作者：
Peschel, Ulf
中科院分区：
文献类型：
--
作者：
Regensburger, Alois;Miri, Mohammad-Ali;Peschel, Ulf
我们首次提供了宇称时间（PT）对称网格周期势中缺陷态的实验演示。我们的结果表明，尽管这些局域模式仍然局域于 PT 对称周期环境中，但它们可能会经历突然的相变。更有趣的是，只要它们的特征值与光谱连续部分内的异常点相关，就可以观察到此类缺陷线性增长的辐射发射。还报告了带隙区域之外存在的局部复杂模式及其演化动态。
We provide the first experimental demonstration of defect states in parity-time (PT) symmetric mesh-periodic potentials. Our results indicate that these localized modes can undergo an abrupt phase transition in spite of the fact that they remain localized in a PT-symmetric periodic environment. Even more intriguing is the possibility of observing a linearly growing radiation emission from such defects provided their eigenvalue is associated with an exceptional point that resides within the continuum part of the spectrum. Localized complex modes existing outside the band-gap regions are also reported along with their evolution dynamics.