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We investigate directly at the microscale the morphology of theelectrowetting induced transition between the Cassie-Baxter and Wenzel statesfor a water droplet on a superhydrophobic surface. Our experiments demonstratethat the transition originates in a very narrow annular region near themacroscopic contact line, which is first invaded by water and causes a thinfilm of air to be entrapped below. At high applied voltages, a growing fractionof microscopic air-pockets collapse, resulting in a partialWenzel state.Modulations in the intensity of the light reflected from individualmicro-menisci clarify that the local contact angles near the filling transitionare close to the usual advancing values for contact lines on smooth surfaces.

Microscopic structure of electrowetting-driven transitions on superhydrophobic surfaces