Atom-optical elements on micro chips
  We describe the realization of atom-optical elements as magnetic waveguide potentials, beam splitters and gravitational traps on a microchip. The microchip was produced by electroplating gold conductors on an aluminium-oxide substrate. The conductors are 30-150 $\mu$m wide and allow for the generation of waveguides at large distances to the chip surface, where surface effects are negligible. We show that these elements can be integrated on a single chip to achieve complex atom-optical circuits. 
S. Kraft, A. Guenther, P. Wicke, B. Kasch, C. Zimmermann, and J.   Fortagh