Researchers have experimentally demonstrated that self-assembled hyperuniform systems in microfluidic channels exhibit photonic band gap properties. This finding is significant because hyperuniformity, a form of long-range order that suppresses density fluctuations at large scales, has been theoretically proposed as a pathway to design materials with robust photonic gaps. The novelty lies in the observation of these properties in self-assembled structures and in the ability to control their characteristics by manipulating flow parameters.

The work addresses the search for materials with photonic gaps, regions of energy where light propagation is forbidden, which are fundamental for light control in optical devices. Traditionally, these materials have been designed from periodic photonic crystals. However, hyperuniform systems offer a promising alternative, as their correlated disorder can lead to isotropic and robust photonic gaps, less sensitive to defects than periodic crystals. This study advances the understanding of how hyperuniformity can be exploited in practice for photonics.

The method employed consisted of the self-assembly of particles in a microfluidic channel, where flow conditions were adjusted to induce the formation of hyperuniform structures. Through optical characterization of these systems, the existence of photonic band gaps was confirmed. The results demonstrate that the band gap properties, such as their position and width, can be tuned by varying particle size and hydrodynamic conditions. This opens the door to the fabrication of programmable and adaptable photonic devices, with potential applications in sensors, lasers, and waveguides.