  We investigate active spatial control of polariton condensates independently
of the polariton-, gain-inducing excitation profile. This is achieved by
introducing an extra intracavity semiconductor layer, non-resonant to the
cavity mode. Saturation of the optical absorption in the uncoupled layer
enables the ultra-fast modulation of the effective refractive index and,
through excited-state absorption, the polariton dissipation. Utilising these
mechanisms, we demonstrate control over the spatial profile and density of a
polariton condensate at room temperature.
