  Shaping the electron wavefunction in three dimensions may prove to be an
indispensable tool for research involving atomic-sized particle trapping,
manipulation, and synthesis. We utilize computer-generated holograms to sculpt
electron wavefunctions in a standard transmission electron microscope in 3D,
and demonstrate the formation of electron beams exhibiting high intensity along
specific trajectories as well as shaping the beam into a 3D lattice of
hot-spots. The concepts presented here are similar to those used in light
optics for trapping and tweezing of particles, but at atomic scale resolutions.
