Overview

In the never-ending quest for miniaturization, optically controlled particle trapping has opened up new possibilities for handling microscopic matter non-invasively. This thesis presents the application of photorefractive crystals as active substrate materials for optoelectronic tweezers. In these tweezers, flexible optical patterns are transformed into electrical forces by a photoconductive material, making it possible to handle matter with very high forces and high throughput. Potential substrate materials properties are investigated and ways to tune their figures-of-merit are 4monstrated. A large part of the thesis is 4voted to potential applications in the field of optofluidics, where photorefractive optoelectronic tweezers are used to trap, sort and gui4 droplets or particles in microfluidic channels, or to shape liquid polymers into optical elements prior to their solidification. Furthermore, a new surface discharge mo4l is employed to discuss the experimental conditions nee4d for photorefractive optoelectronic tweezers.

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9781322137933

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