Low-power and non-invasive optical manipulation of tiny objects is important in both material science and life science. Harnessing the high-efficiency light-to-heat conversion and the thermophoretic migration under a temperature gradient, we explore the opto-thermo-mechanic coupling during light-matter interaction and develop an indirect optical manipulation technique termed opto-thermophoresis, which features low operation power and simple optics. Based on this concept, we development new tools such as opto-thermophoretic tweezers, printers, tractors, and motors. Further, we demonstrate these optical tools in different fields, such as biomedical manipulation, bio-sensing, and reconfigurable optics.
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