Symmetry recovery for coupled photonic modes with transversal PT symmetry.
Symmetry recovery for coupled photonic modes with transversal PT symmetry.
复制标题
DOI：
10.1364/ol.40.003922
复制
发表时间：
2015-08
期刊：
影响因子：
3.6
通讯作者：
N. Rivolta;B. Maes
中科院分区：
文献类型：
--
作者：
N. Rivolta;B. Maes
当增益增加通过异常点时，典型的奇偶校验时间 (PT) 对称结构从未中断相位切换到中断相位。相比之下，我们报告了具有不寻常的反向行为的系统，其中对称相位在破坏相位后恢复。我们在由四种耦合模式组成的最简单的系统中对这种现象进行了分析和数值研究，并提出了潜在的介电和等离子体实现。对于耦合常数的特定比例范围，出现了复模合并方案，其中两个不同的未破坏 PT 阶段包含一个破坏的 PT 阶段。这种具有“逆”异常点的机制对于新型 PT 设备的设计很有趣。
Typical parity-time (PT) symmetric structures switch from the unbroken to the broken phase when gain increases through an exceptional point. In contrast, we report on systems with the unusual, reverse behavior, where the symmetric phase is recovered after a broken phase. We study this phenomenon analytically and numerically in the simplest possible system, consisting of four coupled modes, and we present potential dielectric and plasmonic implementations. The complex mode merging scheme, with two distinct unbroken PT phases encompassing a broken one, appears for a specific proportion range of the coupling constants. This regime with "inverse" exceptional points is interesting for the design of novel PT devices.