Point singularity array with metasurfaces

Soon Wei Daniel Lim, Joon‐Suh Park, Dmitry Kazakov, Christina Spägele, Ahmed H. Dorrah, Maryna L. Meretska, Federico Capasso

Abstract

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 TiO

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• PubMed Central - View
• arXiv (Cornell University) - View - PDF
• PubMed - View
• Nature Communications - View - PDF