A quantum-gas microscope for fermionic potassium

Recent experiments with single-site resolution and addressing of strongly correlated rubidium atoms in optical lattices have resulted in the direct observation of, e.g., bosonic Mott insulators, and out-of-equilibrium physics. Here we present a quantum-gas microscope for single-atom-resolved fluorescence detection of fermionic $^{40}$K. The atoms are held in a single layer of a 1064\,nm optical lattice and observed by a high-resolution optical microscope with numerical aperture NA=0.68. This setup will enable quantum simulation of the Fermi-Hubbard model with single-particle access, allowing for the direct observation and characterization of, e.g., fermionic Mott insulators, Band insulators, metallic phases or N\'{e}el antiferromagnets.