Lim, Soon Wei Daniel Park, Joon-Suh Kazakov, Dmitry Spaegele, Christina M. Dorrah, Ahmed H. Meretska, Maryna L. Capasso, Federico 2024-01-19T09:30:08Z 2024-01-19T09:30:08Z 2023-11-29 2023-06 2041-1723 https://pubs.kist.re.kr/handle/201004/113611 Phase singularities are loci of darkness surrounded by monochromatic light in a scalar field, with applications in optical trapping, super-resolution imaging, and structured light-matter interactions. Although 1D singular structures, like optical vortices, are common due to their robust topological properties, uncommon 0D (point) and 2D (sheet) singularities can be generated by wavefront-shaping devices like metasurfaces. With the design flexibility of metasurfaces, we deterministically position ten identical point singularities using a single illumination source. The phasefront is inverse-designed using phase-gradient maximization with an automatically-differentiable propagator and produces tight longitudinal intensity confinement. The array is experimentally realized with a TiO2 metasurface. One possible application is blue-detuned neutral atom trap arrays, for which this field would enforce 3D confinement and a potential depth around 0.22 mK per watt of incident laser power. We show that metasurface-enabled point singularity engineering may significantly simplify and miniaturize the optical architecture for super-resolution microscopes and dark traps. English Nature Publishing Group Point singularity array with metasurfaces Article 10.1038/s41467-023-39072-6 1 Nature Communications, v.14, no.1 Nature Communications 14 1 Y scie scopus 001094815300026 2-s2.0-85160972894 Multidisciplinary Sciences Science & Technology - Other Topics Article OPTICAL VORTICES PHASE IMAGE TRAP ATOM