Line Waves in Non-Hermitian Metasurfaces,ACS Photonics

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Line Waves in Non-Hermitian Metasurfaces
ACS Photonics ( IF 6.5 ) Pub Date : 2020-06-30 , DOI: 10.1021/acsphotonics.0c00465
Massimo Moccia ₁ , Giuseppe Castaldi ₁ , Andrea Alù _{2,

3} , Vincenzo Galdi ₁

Affiliation

Planar junctions between reactive surface impedances with dual character (capacitive/inductive) can sustain line waves localized both in-plane and out-of-plane around the discontinuity, which propagate unattenuated along one-dimensional paths. Due to their attractive properties, these waves are of potential interest in applications ranging from integrated photonics to optical sensing. Here, we introduce and explore a non-Hermitian platform supporting these exotic modes based on parity–time symmetry. Specifically, we show that line waves can occur in the presence of a uniform surface reactance (either capacitive or inductive) and a symmetric resistance discontinuity from negative to positive values (i.e., gain and loss). We study analytically and numerically the propagation properties of these waves and the underlying physical mechanisms and also illustrate their intriguing properties in terms of confinement, reconfigurability, spin-momentum locking and lasing. Finally, we address possible practical implementations based on photoexcited graphene. Our results hold intriguing potentials for applications in flat optics and reconfigurable photonics.

中文翻译：

非Hermitian超曲面中的线波

具有双重特征（电容性/电感性）的电抗性表面阻抗之间的平面结可以维持不连续点附近平面内和平面外局部的线波，这些线波沿一维路径传播不衰减。由于其吸引人的特性，这些波在从集成光子到光学传感的应用中具有潜在的兴趣。在这里，我们介绍并探索一个基于奇偶时间对称性支持这些奇异模式的非Hermitian平台。具体而言，我们表明，在存在均匀的表面电抗（电容性或电感性）和对称的电阻不连续（从负值到正值（即增益和损耗））的情况下，会发生线波。我们对这些波的传播特性及其潜在的物理机理进行了分析和数值研究，并从限制，可重构性，自旋动量锁定和激光发射方面说明了它们的有趣特性。最后，我们讨论了基于光激发石墨烯的可能的实际实现。我们的结果为在平板光学和可重构光子学中的应用提供了诱人的潜力。

更新日期：2020-08-19

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