  Imaging the features of a sample using Positron Annihilation Spectroscopy
(PAS) is currently achieved by rastering, i.e. by scanning the sample surface
with a sharply focused positron beam. However, a beam of arbitrary shape
(sculpted beam) would allow the application of more versatile single-pixel
imaging (SPI) techniques. I introduce the design of a microelectronic device
employing a 2D array of Zener diodes as an active positron moderator, capable
of sculpting positron beams with 6um resolution. The re-emitted positrons are
accelerated towards the sample through a miniaturised electrostatic lens system
and reaching 100nm resolution. The fast switch-on (90ps) and switch-off (250ps)
time of the device would enable state-of-the-art positron annihilation lifetime
spectroscopy (PALS) and PAS imaging with high spatial and temporal resolution.
