Interleaved dual-species arrays of single atoms using a passive optical element and one trapping laser
Abstract
We demonstrate trapping of individual rubidium (Rb) and cesium (Cs) atoms in an interleaved array of bright tweezers and dark bottle-beam traps, using a microfabricated optical element illuminated by a single laser beam and a 4F system with spatial filtering. Our approach exploits the opposite-sign dynamic polarizabilities of Rb and Cs, ensuring each species is exclusively trapped in either bright or dark sites. The passive optical mask creates optimal trap depths for both species using three transmittance levels while minimizing the optical phase difference, implemented using a variable-thickness absorbing layer of amorphous germanium. This trapping architecture achieves atom loading rates close to 50% while reducing system complexity compared to conventional methods using active optoelectronic components and/or multiple laser wavelengths.
Keywords
Cite
@article{arxiv.2412.20261,
title = {Interleaved dual-species arrays of single atoms using a passive optical element and one trapping laser},
author = {Chengyu Fang and Jared Miles and Jonathan Goldwin and Martin Lichtman and Matthew Gillette and Michael Bergdolt and Sanket Deshpande and Sam A. Norrell and Preston Huft and Mikhail A. Kats and Mark Saffman},
journal= {arXiv preprint arXiv:2412.20261},
year = {2025}
}
Comments
Updated manuscript including a new figure (Fig. 2) and additional materials in the supplementary section