  We study long range density fluctuations (hyperuniformity) in two-dimensional
jammed packings of bidisperse droplets. Taking advantage of microfluidics, we
systematically span a large range of size and concentration ratios of the two
droplet populations. We identify various defects increasing long range density
fluctuations mainly due to organization of local particle environment. By
choosing an appropriate bidispersity, we fabricate materials with a high level
of hyperuniformity. Interesting transparency properties of these optimized
materials are established based on numerical simulations.
