Towards Super- and Subradiance of Strontium Atoms in Optical Tweezer Arrays

We report progress toward an experimental platform of ordered ⁸⁸Sr tweezer arrays for the exploration of collective photon effects, including super- and subradiance. As an initial step, we prepare Sr atoms in the metastable ³P₂ state and probe the mid-infrared (IR) 5s5p ³P₂ - 5s4d ³D₃ transition near 2923 nm. We use tweezers at a magic wavelength for this transition and demonstrate single-atom trapping, cooling, and high-fidelity imaging. We further explore coherent control on the mid-IR line. Together, these capabilities establish a foundation for studying collective photon effects in subwavelength optical tweezer arrays with arbitrary geometries generated using holographic metasurfaces [1].