Tuesday, October 2, 2012

Photophoretic trampoline—Interaction of single airborne absorbing droplets with light

Michael Esseling, Patrick Rose, Christina Alpmann, and Cornelia Denz
We present the light-induced manipulation of absorbing liquid droplets in air. Ink droplets from a printer cartridge are used to demonstrate that absorbing liquids—just like their solid counterparts—can interact with regions of high light intensity due to the photophoretic force. It is shown that droplets follow a quasi-ballistic trajectory after bouncing off a high intensity light sheet. We estimate the intensities necessary for this rebound of airborne droplets and change the droplet trajectories through a variation of the manipulating light field.
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