Here we study aspheric phase pattern geometric-phase lenses through the
design of doublet lenses in Zemax Optic Studio and in MATLAB using a simple ray
tracing code. The solutions developed use variable spacer distances and are
solved monochromatically (at 633 nm) and polychromatically (at 450, 532, and
633 nm). After selecting a Zemax generated polychromatically optimized doublet
solution, we fabricated the lens utilizing liquid crystal films and direct
writing. We characterized the liquid crystal alignment quality, efficiencies,
and spot performance of this lens in comparison to a standard spherical singlet
of the same back focal length and diameter (24.5 mm diameter and 40 mm back
focal length at 633 nm). With this aspheric lens profile, we realize the
development of novel focusing phase surfaces