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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 demonstrated. A large part of the thesis is
devoted to potential applications in the field of optofluidics,
where photorefractive optoelectronic tweezers are used to trap,
sort and guide droplets or particles in microfluidic channels, or
to shape liquid polymers into optical elements prior to their
solidification. Furthermore, a new surface discharge model is
employed to discuss the experimental conditions needed for
photorefractive optoelectronic tweezers.
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 demonstrated. A large part of the thesis is
devoted to potential applications in the field of optofluidics,
where photorefractive optoelectronic tweezers are used to trap,
sort and guide droplets or particles in microfluidic channels, or
to shape liquid polymers into optical elements prior to their
solidification. Furthermore, a new surface discharge model is
employed to discuss the experimental conditions needed for
photorefractive optoelectronic tweezers.
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