I will show that, in concept, particles should move when they are photochemically activated in a gradient of light intensity, and the motion occurs in the direction of the vector of the intensity gradient, and its efficiency depends on the respective orientations of the vectors of light polarization and intensity gradient. The theory describes well experimental observations, and it opens important perspectives for the manipulation of matter by light.

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Zouheir Sekkat, "Light-activating materials by molecular machines (Conference Presentation)," Proc. SPIE 11098, Molecular and Nano Machines II, 1109808 (Presented at SPIE Organic Photonics + Electronics: August 14, 2019; Published: 10 September 2019); https://doi.org/10.1117/12.2528139.6083878417001.