论文标题
特殊点的非划分状态
Non-diffracting states at exceptional points
论文作者
论文摘要
我们建议使用特殊点（EP）构建晶格中的无衍射束传播和局部功率振荡。具体而言，在这里，我们提出了两个系统来利用EPS进行无衍射光束传播，一个在合成规格的晶格中，另一个在单向耦合的谐振器中，每个谐振器都能单独产生轨道角动量束（OAM）。在第二个系统中，我们介绍了离散晶格中稳健且可调的OAM束传播的概念。我们表明，可以在光子晶格的任意位点中创建强大的OAM梁。此外，我们报告了非省晶格的EP的功率振荡。我们的研究扩大了EPS在不同光子系统中的研究和应用，包括OAM束及其在离散晶格中相关的动态。
We propose to use exceptional points (EPs) to construct diffraction-free beam propagation and localized power oscillation in lattices. Specifically, here we propose two systems to utilize EPs for diffraction-free beam propagation, one in synthetic gauge lattices and the other one, in unidirectionally coupled resonators where each resonator individually is capable of creating orbital angular momentum beams (OAM). In the second system, we introduce the concept of robust and tunable OAM beam propagation in discrete lattices. We show that one can create robust OAM beams in an arbitrary number of sites of a photonic lattice. Furthermore, we report power oscillation at the EP of a non-Hermitian lattice. Our study widens the study and application of EPs in different photonic systems including the OAM beams and their associated dynamics in discrete lattices.
