Fig. 3: .

Optimization of signal observation window geometry. a Effect of the OW geometry on OW filling time. The filling time of a typical square-shaped OW is around 90 s, while the lenticular with diverter OW geometry allows for <60 s filling time; As the food dye flows into the OW, the pre-filled water generates resistance as it is being displaced, which produces a diffusion front allowing observation of the OW filling dynamics; b COMSOL simulation of the flow velocity profile in the uCR-Chip with a square OW shape; COMSOL simulation of the flow velocity profile in the uCR-Chip that has a lenticular OW with (c) or without (d) a diverter. The lenticular OW with a diverter shows a more uniform flow velocity in the center region of the OW comparing to the square OW or the lenticular OW without a diverter