  In this Fluid Dynamics Videos submitted to the 31st Gallery of Fluid Motion,
(find a different version here http://youtu.be/CS0c05WQ_js) we illustrate the
special dynamics of capillary self-propelled Leidenfrost droplets in
micrometric Ratchets. In order to be able to propel water droplets of sizes of
the order of 1 mm, micro-ratchets were produced by direct material removal
using a picosecond pulsed laser source. Surface micro-patterning with
picosecond laser pulses allows creating a well controlled topography on a
variety of substrates, with a resolution typically in the micron range. More
information can be found in references.
