Device and method for dispensing a droplet

A device for dispensing one or more microdroplets, the device comprising a microfluidic chip having an optically-mediated electrowetting (oEWOD) structure configured to create an oEWOD force,

• the microfluidic chip includes a first region and a second region, wherein said first and second regions are separated by a constriction;
• wherein the first region is adapted to receive and manipulate one or more microdroplets dispersed in a carrier fluid at a first flow rate;
• and wherein the second region is configured to receive the microdroplet via the constriction from the first region and transfer said microdroplet to an outlet port of the microfluidic chip in a second flow rate;
• wherein the second region is configured to receive said microdroplet via the constriction from the first region by application of an optically-mediated electrowetting (oEWOD) force;
• and
• wherein the device further comprises a valve and/or a pump, the valve and/or the pump is configured to enable the microdroplet to be dispensed through and out of the outlet port of the chip;
• and
• a controller configured to control the valve and/or the pump such that the second flow rate in the second region is higher than the first flow rate in the first region.