Our Cs atoms are stored ~500nm apart from each other in the potential wells of two-dimensional standing wave dipole trap. The trap itself is a 150µm away from the first surface of the objective.
The high numerical aperture objective (NA = 0.92) features a aplanatic solid immersion lens and a aspheric lens to shift the image plane to 150µm above the first surface. The resulting resolution is calculated to be 564 nm at the Cs D1-line at 852 nm and will allow us to resolve single sites of the lattice. Furthermore, it will be used in the reverse way to address single atoms by steering beams.
