Topological-darkness-assisted phase regulation for atomically thin meta-optics
Topological-darkness-assisted phase regulation for atomically thin meta-optics
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2019-12
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通讯作者：
Yingwei Wang;Zi-lan Deng;Dejiao Hu;Jian Yuan;Qingdong Ou;Fei Qin;Yinan Zhang;Ouyang Xu;Bo Peng;Yaoyu Cao;B. Guan;Yupeng Zhang;Jun He;C. Qiu;Q. Bao;Xiangping Li
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作者：
Yingwei Wang;Zi-lan Deng;Dejiao Hu;Jian Yuan;Qingdong Ou;Fei Qin;Yinan Zhang;Ouyang Xu;Bo Peng;Yaoyu Cao;B. Guan;Yupeng Zhang;Jun He;C. Qiu;Q. Bao;Xiangping Li
二维（2D）贵金属二硫族化合物已经成为实现具有相当程度小型化的通用平面光学的新平台。然而，由于二维材料的厚度消失和本征损耗完全抑制了共振和相位积累效应，在原子尺度上的光场操纵被广泛认为是不可能实现的。在固有损耗的不利影响下，我们证明了与均匀衬底集成的结构PtSe2薄膜可以调节非平凡的奇异相，并在拓扑黑暗存在的情况下实现原子厚度的元光学。我们通过实验证明了一系列原子厚度二元元光学器件，在可见光频率下，在厚度仅为4.3 nm的情况下，可以实现0.96%/nm的高单位厚度衍射效率和角鲁棒性。我们的研究结果揭示了一种新型二维平面光学在原子厚度光场操纵方面的潜力。
Two-dimensional (2D) noble-metal dichalcogenides have emerged as a new platform for the realization of versatile flat optics with a considerable degree of miniaturization. However, light field manipulation at the atomic scale is widely considered unattainable since the vanishing thickness and intrinsic losses of 2D materials completely suppress both resonances and phase accumulation effects. Empowered by conventionally perceived adverse effects of intrinsic losses, we show that the structured PtSe2 films integrated with a uniform substrate can regulate nontrivial singular phase and realize atomic-thick meta-optics in the presence of topological darkness. We experimentally demonstrate a series of atomic-thick binary meta-optics that allows angle-robust and high unit-thickness diffraction efficiency of 0.96%/nm in visible frequencies, given its thickness of merely 4.3 nm. Our results unlock the potential of a new class of 2D flat optics for light field manipulation at an atomic thickness.