Photoelectrowetting
Photoelectrowetting can be observed if the conductor in the liquid/insulator/conductor stack used for electrowetting is replaced by a semiconductor. By optically modulating the number of carriers in space-charge region of the semiconductor, the contact angle of a liquid droplet can be altered in a continuous way. This effect can be explained by a modification of the Young-Lippmann equation.
Read more about this topic: Electrowetting