A variety of different flow-focusing junctions can be found here with varying nozzle sizes and numbers of inlets.
3 inlets with short delay channel
3 inlets with long delay channel
Here is the design for a device for on-chip electrosorting of microfluidic droplets.
Electrosorting device 1
Electrosorting device 2
Here is the design for absorbance-activated droplet sorting with embedded fiber optics:
Design of device used for 'Deep learning guided image-based droplet sorting for on-demand selection and analysis of single cells and 3D cell cultures', Lab-on-a-Chip, 2020 (doi:10.1039/D0LC00055H)