  We propose that excitons in moir\'e transition metal dichalcogenide bilayers
offer a promising platform for investigating collective radiative properties.
While some of these optical properties resemble those of cold atom arrays,
moir\'e excitons extend to the deep subwavelength limit, beyond the reach of
current optical lattice experiments. Remarkably, we show that the collective
optical properties can be exploited to probe certain correlated electron
states. Specifically, we illustrate that the Wigner crystal states of electrons
doped into these bilayers act as an emergent periodic potential for excitons.
Moreover, the collective dissipative excitonic bands and their associated Berry
curvature can reveal various charge orders that emerge at the corresponding
electronic doping. Our study provides a promising pathway for future research
on the interplay between collective effects and strong correlations involving
moir\'e excitons.
