  Experiments on light dragging in a moving medium laid the cornerstones of
modern physics more than a century ago, and they still are in the focus of
current research. When linearly polarized light is transmitted through a
rotating dielectric, the polarization plane is slightly rotated -- a phenomenon
first studied by Fermi in 1923. For typical non-resonant dielectric materials,
the measured polarization drag angle does not surpass several microradians.
Here we show that this effect may be dramatically enhanced if the light is sent
to a gas of fast unidirectionally spinning molecular superrotors. Several
femtosecond-laser labs have already succeeded in optically creating such a
medium. We show that the specific rotation power of the superrotor medium
exceeds the values previously observed in mechanically rotated bulk optical
specimens by many orders of magnitude. This nonreciprocal opto-mechanical
phenomenon may open new avenues for ultra-fast control of the polarization
state of light.
