Polaritons in 2D semiconductor microcavities have been a unique manybody system that demonstrates non-equilibrium quantum orders. To go beyond 2D condensation physics, it becomes important to control the fundamental properties of polaritons without destroying the quantum orders. I will discuss a unconventional microcavity system we make. It incorporates a slab photonic crystal as one of the cavity mirrors to confine, control and coupling polaritons in a non-destructive and scalable manner. We showed that strong-coupling can be established in the new cavity system, fundamental properties of the polaritons can be controlled by design, including the polarization, energy-momentum dispersion, and dimensionality. Coupled polariton systems are readily created. We also showed single-mode polariton lasing in a 0D cavity, which, unlike (quasi) 2D polariton lasers demonstrated in the past, featured Poisson intensity noise expected of a coherent state and strong condensate interactions manifested in Gaussian line-broadening of the polariton laser. Such a 0D polariton lasers provides a building block for coupled polariton lattices with designable fundamental properties. It may open a door to experimental implementation of coupled cavity quantum electrodynamics systems and quantum technologies based on manybody quantum fluids.
