  We characterize the loading, containment and optical properties of
all-optical atom traps implemented by diffractive focusing with one-dimensional
(1D) microstructures milled on gold films. These on-chip Fresnel lenses with
focal lengths of the order of a few hundred microns produce
optical-gradient-dipole traps. Cold atoms are loaded from a mirror
magneto-optical trap (MMOT) centered a few hundred microns above the gold
mirror surface. Details of loading optimization are reported and perspectives
for future development of these structures are discussed.
