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Experimental setup for the optically actuated thermocapillary movement of air bubbles. A , laser is focused onto the absorbing substrate of a fluidic chamber by a objective lens. Air bubbles in the silicone oil have a contact angle of approximately 180°, as the oil completely wets the surface of the substrate.
(Color online) Optically actuated thermocapillary movement of an air bubble in silicone oil. A -diameter bubble is trapped in the thermal trap created by a laser focused on the absorbing substrate (a). The oil/air meniscus can be seen at the top left. The bubble follows the position of the laser spot, as it is scanned in the positive direction (b) and then in the positive direction (c). The bubble is then moved in the negative and negative directions (d). The initial bubble position is indicated by a dashed circle, and the approximate trajectory of the bubble is indicated by a dashed line.
(Color online) Optically actuated thermocapillary movement-induced velocities of air bubbles as a function of laser intensity. The solid lines are linear fits to the data points.
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