Multilayer Microwell Arrays for High Density Reactor Integration

The patent transitions from a two-dimensional planar microwell array to a three-dimensional multilayer structure. Multiple substrates with microwell arrays are stacked vertically and secured together, creating wells in different spatial layers. This dimensional transition allows reactors to be arranged in three dimensions rather than confined to a single plane, dramatically increasing the number of reactors that can be packed into a given footprint while maintaining adequate imaging area coverage.

The patent divides the high-density reactor array into multiple separate substrates, each containing a microwell array with moderate aspect ratios that are manufacturable using standard techniques. Each substrate can be fabricated independently with controlled well dimensions, then assembled into a stacked configuration. This segmentation allows the system to achieve high overall density without requiring individual wells to have extreme aspect ratios, thus maintaining manufacturing feasibility.

The patent employs surfactant-free aqueous fluids contained within the fixed microwell structures. The microwells themselves provide the containment function that would otherwise require surfactants in droplet-based systems. By using the well walls as the containment boundary rather than relying on surfactant-stabilized droplets, the system achieves stable, immovable reactor contents without needing surfactants, enabling reliable real-time imaging.