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Simulation and production of reconfigurable opto-electronic traps on iron doped Lithium Niobate substrate

Date Do, 11.09.2014 - Do, 11.09.2014
Time 11.15
Speaker Michela Gazzetto, Laboratory of Quantum Electronics and Nonlinear Optics, Electronics Department, University of Pavia, Italy
Location Universität Bern, Institut für Angewandte Physik, Gebäude exakte Wissenschaften, Hörsaal B116, Sidlerstrasse 5, 3012 Bern
Program Opto-electronics tweezers are a promising technique for the realization of fast, highly-reconfigurable array of traps for particle immobilization and manipulation. Exploiting a photoconductive substrate, like Lithium Niobate, a static electric field induced by light can be used to trap a particle, either a cell or an inorganic neutral object by means of a dielectrophoretic force. LN is a very promising material thanks to the presence of the photorefractive effect, that is the insurgence of a semi- permanent yet erasable electric field, called space-charge field, when is illuminated with a light in the visible range. This work combines the known numerical results on photorefractive effect to calculate the dielectrophoretic force on particles suspended in a buffer solution, lying on top of the LN sample surface. An experimental validation of the simulation results was also performed using Poly-methyl-methacrylate beads suspended in paraffin oil on an iron doped LN sample (Fe: LiNbO3).
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