  By engineering atomic geometries composed of nearly 1000 atomic segments
embedded in micro-resonators we observe Bragg resonances induced by the atomic
lattice at the telecommunication wavelength. The geometrical arrangement of
erbium atoms into a lattice inside a silicon nitride microring resonator
reduces the scattering loss at a wavelength commensurate with the lattice. We
confirm dependency of light emission to the atomic positions and lattice
spacing and also observe Fano interference between resonant modes in the
system.
