Plasmonic topological metasurface by encircling an exceptional point
Plasmonic topological metasurface by encircling an exceptional point
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DOI：
10.1126/science.abj3179
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发表时间：
2021-09-03
期刊：
影响因子：
56.9
通讯作者：
Genevet, Patrice
中科院分区：
文献类型：
--
作者：
Song, Qinghua;Odeh, Mutasem;Genevet, Patrice
共振散射、导模传播相位和/或取向相关的相位延迟是迄今为止用于构思光学超颖表面的三种主要机制。在这里，我们引入了一个额外的自由度，以解决光学相位工程，利用其奇异点附近的非厄米矩阵的拓扑特征。选择元表面构建块来围绕参数空间中任意闭合轨迹的奇点，我们在特定反射偏振通道上设计了一个拓扑保护的全2 p相位。实现的容易性及其与其他相位寻址机制的兼容性将拓扑特性带入光频工业应用领域，并证明元表面技术是研究和验证拓扑光子概念的方便测试平台。
Resonant scattering, guided mode propagation phase, and/or orientation-dependent phase retardations are the three main mechanisms used to date to conceive optical metasurfaces. Here, we introduce an additional degree of freedom to address optical phase engineering by exploiting the topological features of non-Hermitian matrices operating near their singular points. Choosing metasurface building blocks to encircle a singularity following an arbitrarily closed trajectory in parameter space, we engineered a topologically protected full 2p-phase on a specific reflected polarization channel. The ease of implementation together with its compatibility with other phase-addressing mechanisms bring topological properties into the realm of industrial applications at optical frequencies and prove that metasurface technology represents a convenient test bench to study and validate topological photonic concepts.