Chirality-Assisted Aharonov–Anandan Geometric-Phase Metasurfaces for Spin-Decoupled Phase Modulation,ACS Photonics

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Chirality-Assisted Aharonov–Anandan Geometric-Phase Metasurfaces for Spin-Decoupled Phase Modulation
ACS Photonics ( IF 6.5 ) Pub Date : 2021-05-19 , DOI: 10.1021/acsphotonics.1c00505
Ruonan Ji ₁ , Xin Xie ₁ , Xuyue Guo ₁ , Yang Zhao ₁ , Chuan Jin ₂ , Kun Song ₁ , Shaowei Wang ₃ , Jianbo Yin ₁ , Yahong Liu ₁ , Chengming Jiang ₄ , Chaoshun Yang ₁ , Xiaopeng Zhao ₁ , Wei Lu ₃

Affiliation

In this work, a quasi-nondispersive and spin-decoupled phase modulation strategy was proposed based on the chiral structure. Owing to the spin-dependent response of the chiral structure, the evolution of the Aharonov–Anandan (AA) geometric phase can be controlled by tuning different structural parameters independently. Additionally, the chiral structure was designed nonresonant or weak-resonant to minimize the influence of strong resonant absorption and large dispersive propagation phase shift, leading to an efficiently quasi-nondispersive phase modulation. To prove the validity of the strategy, a series of umbrella-shaped reflection-type metal–insulator–metal structures were designed as the unit cells and simulated with the finite element method. Moreover, the metasurfaces were designed based on such unit cells to generate broadband orbital angular momentums with different topological charges and spin-switchable holograms, respectively. Simulated and experimental results are in good agreement with the theoretical results. To the best of our knowledge, broadband spin-dependent phase modulation has been achieved without intentionally merging other types of phases for the first time in this work. We believe that this strategy provides a flexible approach for complex spin- or polarization-related applications in optical communication, integrated optics, optical sensing, and other related fields.

中文翻译：

用于自旋解耦相位调制的手性辅助 Aharonov-Anandan 几何相位超表面

在这项工作中，基于手征结构提出了一种准非色散和自旋解耦的相位调制策略。由于手性结构的自旋相关响应，可以通过独立调整不同的结构参数来控制 Aharonov-Anandan (AA) 几何相的演变。此外，手征结构被设计为非共振或弱共振，以最大限度地减少强共振吸收和大色散传播相移的影响，从而实现有效的准非色散相位调制。为了证明该策略的有效性，设计了一系列伞形反射型金属-绝缘体-金属结构作为晶胞，并用有限元方法进行了模拟。而且，超表面是基于这样的晶胞设计的，以分别产生具有不同拓扑电荷和自旋可切换全息图的宽带轨道角动量。模拟和实验结果与理论结果吻合良好。据我们所知，在这项工作中第一次没有故意合并其他类型的相位，就已经实现了宽带自旋相关相位调制。我们相信，这种策略为光通信、集成光学、光学传感和其他相关领域中复杂的自旋或偏振相关应用提供了一种灵活的方法。在这项工作中，第一次在没有有意合并其他类型的相位的情况下，已经实现了宽带自旋相关相位调制。我们相信，这种策略为光通信、集成光学、光学传感和其他相关领域中复杂的自旋或偏振相关应用提供了一种灵活的方法。在这项工作中，第一次在没有有意合并其他类型的相位的情况下，已经实现了宽带自旋相关相位调制。我们相信，这种策略为光通信、集成光学、光学传感和其他相关领域中复杂的自旋或偏振相关应用提供了一种灵活的方法。

更新日期：2021-06-17

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