  Chip-scale light-atom interactions are vital for the miniaturization of
atomic sensing systems, including clocks, magnetometers, gyroscopes and more.
Combining as many photonic elements as possible onto a photonic chip greatly
reduces size and power consumption, where the critical elements are those
interfacing between the 2D circuit and the 3D vapor cell. We introduce a new
design method for large scale two-dimensional converter structures, enabling
out-coupling of radiation from the photonic chip into the atomic medium. These
structures allow light intensity and phase spatial distribution and
polarization control, without external light-manipulating elements. Large,
100x100 {\mu}m2 structures were designed generating low divergence optical
beams with high degree of circular polarization. Simulations obtain mean
circular polarization contrast of better than 30 dB.
