  We propose metasurface holograms as a novel platform to generate optical trap
arrays for cold atoms with high fidelity, efficiency, and thermal stability. We
developed design and fabrication methodologies to create dielectric, phase-only
metasurface holograms based on titanium dioxide. We experimentally demonstrated
optical trap arrays of various geometries, including periodic and aperiodic
configurations with dimensions ranging from 1D to 3D and the number of trap
sites up to a few hundred. We characterized the performance of the holographic
metasurfaces in terms of the positioning accuracy, size and intensity
uniformity of the generated traps, and power handling capability of the
dielectric metasurfaces. Our proposed platform has great potential for enabling
fundamental studies of quantum many-body physics, and quantum simulation and
computation tasks. The compact form factor, passive nature, good power handling
capability, and scalability of generating high-quality, large-scale arrays also
make the metasurface platform uniquely suitable for realizing field-deployable
devices and systems based on cold atoms.
