Liu Xujing, Kan Yinhui, Kumar Shailesh, Kulikova Liudmila F, Davydov Valeriy, Agafonov Viatcheslav, Ding Fei, Bozhevolnyi Sergey I
Center for Nano Optics, University of Southern Denmark, DK-5230 Odense M, Denmark.
L. F. Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Moscow 108840, Russia.
Nano Lett. 2024 Oct 30;24(43):13867-13873. doi: 10.1021/acs.nanolett.4c03258. Epub 2024 Sep 19.
Solid-state quantum emitters (QEs) with arbitrary direction emission and well-defined polarization are critical for scalable single-photon sources and quantum information processing. However, the design strategy for on-chip generation of off-normal photon emission with high-purity polarization characteristics has so far remained elusive. Here, we introduce the anisotropic holography metasurfaces for efficiently manipulating the emission direction and polarization of QE. The proposed method offers a flexible way to realize phase matching in surface plasmon scattering with spatially varying filling factors and provides an efficient route for designing advanced QE-coupled metasurfaces. By nonradiatively coupling nanodiamonds with metasurfaces, we experimentally demonstrate on-chip generation of well-collimated single-photon emission propagating along off-normal directions (i.e., 20° and 30°) featuring a divergence angle lower than 2.5°. The experimental average degree of linear polarization attains up to >0.98, thereby revealing markedly high polarization purity. This study facilitates applications of QEs in the deployment of integrated quantum networks.
具有任意方向发射和明确偏振的固态量子发射器（QEs）对于可扩展的单光子源和量子信息处理至关重要。然而，迄今为止，用于片上产生具有高纯度偏振特性的非垂直光子发射的设计策略仍然难以捉摸。在这里，我们引入了各向异性全息超表面，以有效地操纵量子发射器的发射方向和偏振。所提出的方法提供了一种灵活的方式来实现具有空间变化填充因子的表面等离子体散射中的相位匹配，并为设计先进的量子发射器耦合超表面提供了一条有效途径。通过将纳米金刚石与超表面非辐射耦合，我们通过实验证明了在片上产生沿非垂直方向（即20°和30°）传播的准直良好的单光子发射，其发散角低于2.5°。实验测得的线性偏振平均度高达>0.98，从而显示出明显高的偏振纯度。这项研究促进了量子发射器在集成量子网络部署中的应用。
