Zehao Chang

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We demonstrate a novel optoelectronic tweezer using light induced dielectrophoresis mechanism to optically trap and transport micro particles with optical power in the μW range. This device consists of two pattern-less surfaces: a bottom glass substrate coated with photoconductive material and a top transparent indium-tin-oxide (ITO) glass. To achieve(More)
We have demonstrated a 2D droplet manipulation platform allowing fully optical manipulation of droplets on a photosensitive surface. Optically controlled injection, transport, separation, and multiple droplet manipulation have been achieved for nanoliter-size droplets. These functions are realized by sandwiching the droplets between two optoelectrowetting(More)
A light-actuated microfluidic device has been successfully fabricated to inject, move, separate, and merge liquid droplets with nano-liter volumes. Light actuation is realized by sandwiching the liquid droplets between two photosensitive surfaces whose wettability can he changed by light. By integrating a photoconductor with an electrowetting electrode, the(More)
We demonstrate a novel optoelectronic tweezer using light induced dielectrophoresis mechanism to optically trap and transport micro particles with optical power in the pW range. This device consists of two pattem-less surfaces: a bottom glass substrate coated with photoconductive material and a top transparent indium-tin-oxide (ITO) glass. To achieve(More)
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