  Semiconductor exciton-polaritons in planar microcavities form coherent
two-dimensional condensates in non-equilibrium. However, coupling of multiple
lower-dimensional polariton quantum systems, critically needed for polaritonic
quantum device applications and novel cavity-lattice physics, has been limited
due to the conventional cavity structures. Here we demonstrate full confinement
of the polaritons non-destructively using a hybrid cavity made of a
single-layer sub-wavelength grating mirror and a distributed Bragg reflector.
Single-mode polariton lasing was observed at a chosen polarization.
Incorporation of a designable slab mirror into the conventional vertical
cavity, when operating in the strong-coupling regime, enables confinement,
control and coupling of polariton gasses in a scalable fashion. It may open a
door to experimental implementation of polariton-based quantum photonic devices
and coupled cavity quantum electrodynamics systems.
