  An Archimedes' Screw captures water, feeding energy into it by lifting it to
a higher level. We introduce the first instance of an optical Archimedes'
Screw, and demonstrate how this system is capable of capturing light, dragging
it and amplifying it. We unveil new exact analytic solutions to Maxwell's
Equations for a wide family of chiral space-time media, and show their
potential to achieve chirally selective amplification within widely tunable
parity-time-broken phases. Our work, which may be readily implemented via
pump-probe experiments with circularly polarized beams, opens a new direction
in the physics of time-varying media by merging the rising field of space-time
metamaterials and that of chiral systems, and may form a new playground for
topology and non-Hermitian physics, with potential applications to chiral
spectroscopy and sensing.
