Figure 2

Droplet generation module. Fabrication steps of the droplet generation module of our fiber device shown in Fig. 1(a). (a) A 90 \(\upmu\)m/125 \(\upmu\)m capillary was aligned to the central hole of a five-hole capillary (end face shown inset), where the five holes were 30 \(\upmu\)m in diameter each. (b) The capillaries were fusion spliced ensuring that the four outer holes of the five-hole capillary remained open and the 90 \(\upmu\)m/125 \(\upmu\)m capillary did not collapse. (c) The five-hole capillary was cleaved to a length of approximately 200 \(\upmu\)m. (d) The five-hole capillary section was inserted into the left side of a 255 \(\upmu\)m/333 \(\upmu\)m housing capillary. (e) A 125 \(\upmu\)m/250 \(\upmu\)m capillary was inserted into the right side of the housing capillary and was brought to a distance of approximately 100 \(\upmu\)m from the exit holes of the five-hole capillary. (f) A second 90 \(\upmu\)m/125 \(\upmu\)m capillary was inserted into the left side of the housing capillary.