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Herein we demonstrate the ability to optically tune the mobility ofelectrically powered Janus particles (JP) that are half coated with variousZinc Oxide (ZnO) semiconducting layers, i.e. polycrystalline, amorphous andamorphous with a SiO2 passivation layer. The ZnO semiconductor photo-responseenables increase in its electrical conductivity with light having wavelengthsof sufficient photon energy with respect to the semiconductor bandgap. Thiseffect, termed optically modulated electrokinetic propulsion (OMEP), can beharnessed to increase the contrast in polarizability between the dielectric andsemiconducting hemispheres, which in turn, results in an increasedelectrokinetic mobility. The addition of optical activation to the electricalfield enables an additional degree of control of JP mobility. We alsodemonstrate optical control of collective behavior and particle-particleinteractions for dense semi-conducting Janus particle populations.

Optically Modulated Propulsion of Electric Field Powered Photoconducting Janus Particles