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arXiv 2008.00366physics.optics
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高阶例外点的分层构造

Hierarchical construction of higher-order exceptional points

Q. Zhong, J. Kou, S. K. Ozdemir, R. El-Ganainy

摘要:

高阶例外点(HOEPs)的实现可以导致光-物质相互作用的数量级增强,超过目前的基本限制。不幸的是,在现有方案中实现HOEP是一项相当困难的任务,这是由于制造缺陷的复杂性和敏感性。在这里,我们介绍了一个层次的方法,工程光子结构的HOEP更容易建立和更有弹性的实验不确定性。我们证明了我们的技术的一个例子,涉及奇偶时间(PT)对称的光学微谐振腔与手性耦合之间的每个谐振器的内部光学模式。有趣的是,我们发现,在这个系统中实现HOEPs并不需要均匀的耦合分布-这一特征意味着HOEPs从无序中出现,并提供了对一些制造错误的弹性。我们的结果证实了使用全波模拟的基础上麦克斯韦方程在现实的光学材料系统。

英文摘要:

The realization of higher-order exceptional points (HOEPs) can lead to orders of magnitude enhancement in light-matter interactions beyond the current fundamental limits. Unfortunately, implementing HOEPs in the existing schemes is a rather difficult task, due to the complexity and sensitivity to fabrication imperfections. Here we introduce a hierarchical approach for engineering photonic structures having HOEPs that are easier to build and more resilient to experimental uncertainties. We demonstrate our technique by an example that involves parity-time (PT) symmetric optical microring resonators with chiral coupling among the internal optical modes of each resonator. Interestingly, we find that the uniform coupling profile is not required to achieve HOEPs in this system -- a feature that implies the emergence of HOEPs from disorder and provides resilience against some fabrication errors. Our results are confirmed by using full-wave simulations based on Maxwell's equation in realistic optical material systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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