  Unique and flexible properties of non-Hermitian photonic systems attract
ever-increasing attention via delivering a whole bunch of novel optical effects
and allowing for efficient tuning light-matter interactions on nano- and
microscales. Together with an increasing demand for the fast and spatially
compact methods of light governing, this peculiar approach paves a broad avenue
to novel optical applications. Here, unifying the approaches of disordered
metamaterials and non-Hermitian photonics, we propose a conceptually new and
simple architecture driven by disordered loss-gain multilayers and, therefore,
providing a powerful tool to control both the passage time and the wave-front
shape of incident light with different switching times. For the first time we
show the possibility to switch on and off kink formation by changing the level
of disorder in the case of adiabatically raising wave fronts. At the same time,
we deliver flexible tuning of the output intensity by using the nonlinear
effect of loss and gain saturation. Since the disorder strength in our system
can be conveniently controlled with the power of the external pump, our
approach can be considered as a basis for different active photonic devices.
