Electrically Tunable Topological Singularities in Excitonic Two-Dimensional Heterostructures for Wavefront Manipulation,ACS Photonics

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Electrically Tunable Topological Singularities in Excitonic Two-Dimensional Heterostructures for Wavefront Manipulation
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-15 , DOI: 10.1021/acsphotonics.4c00397
Melissa Li ₁ , Lior Michaeli ₁ , Harry A. Atwater ₁

Affiliation

Analysis of non-Hermitian photonic systems by the spectral positions of their topological singularities plays a central role in their design. Recently, the link between topological phase singularities and existing schemes for wavefront manipulation revealed that the full-2π phase control of light scattering from non-Hermitian metasurfaces is associated with branch cut crossing on the complex frequency plane. Here, we report on controlling the spectral positions of topological singularities for electrically tunable monolayer transition metal dichalcogenide heterostructures so as to actively change their scattering parameters. We use the complex frequency plane trajectories to demonstrate full-2π phase modulation with uniform reflectance, enabling dynamic beam deflection with near-unity diffraction efficiency, and to explore in-plane coupling effects at the surface. Our results can be further extended to explore effects of excitonic resonances on tunable topological platforms for arbitrary wavefront manipulation and exceptional point-based sensing as new directions for active two-dimensional nanophotonics.

中文翻译：

用于波前操纵的激子二维异质结构中的电可调拓扑奇点

通过拓扑奇点的光谱位置对非厄米光子系统进行分析在其设计中起着核心作用。最近，拓扑相位奇点和现有波前操纵方案之间的联系表明，非厄米超表面光散射的全 2π 相位控制与复频率平面上的分支切割交叉相关。在这里，我们报告了控制电可调单层过渡金属二硫族化物异质结构的拓扑奇点的光谱位置，从而主动改变其散射参数。我们使用复杂的频率平面轨迹来演示具有均匀反射率的全 2π 相位调制，从而实现具有接近统一衍射效率的动态光束偏转，并探索表面的面内耦合效应。我们的结果可以进一步扩展，以探索激子共振对可调谐拓扑平台的影响，以实现任意波前操纵和特殊的基于点的传感，作为有源二维纳米光子学的新方向。

更新日期：2024-08-15

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