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Grating-based structures have recently been used as components of magneto-optical traps (MOT) to simplify the setup for trapping Rb atoms. Here, we design diffractive chips to trap more than one atom species. Our full-wave simulations show that a two-dimensional (2D) grating chip can simultaneously have high force-balancing efficiency for a wavelength of 780 nm for trapping Rb atoms and a wavelength of 852 nm for Cs atoms. We fabricated and characterized a mm-scale grating chip using electron-beam lithography, and are in the process of trapping experiments. Our work opens the door to compact multi-species MOTs.
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Zhaoning Yu, Garrett Hickman, Mark E. Saffman, Mikhail A. Kats, "Diffractive chips for magneto-optical trapping of two atomic species," Proc. SPIE 11471, Quantum Nanophotonic Materials, Devices, and Systems 2020, 114710O (20 August 2020); https://doi.org/10.1117/12.2570647