  Arrays of single ultracold molecules promise to be a powerful platform for
many applications ranging from quantum simulation to precision measurement.
Here we report on the creation of an optical tweezer array of single ultracold
CaF molecules. By utilizing light-induced collisions during the laser cooling
process, we trap single molecules. The high densities attained inside the
tweezer traps have also enabled us to observe in the absence of light
molecule-molecule collisions of laser cooled molecules for the first time.
