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Mapping electric fields generated by microelectrodes using optically trapped charged microspheres
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DOI：10.1039/c1lc20432g.png)
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In this work, we show a new technique to measure the direction and amplitude of the electric field generated by microelectrodes in a liquid environment, as often used in microfluidic devices. The method is based on the use of optical tweezers as a force transducer. A trapped, charged particle behaves as a probe. With this technique, it is possible to obtain a detailed map of the electric field, even for very complex electrode structures with a resolution below a micrometre and with a sensitivity as low as a few hundreds of V m(-1).
Keyword:
TWEEZERS
VISCOSITY
FORCES
CELLS
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Interference model for back-focal-plane displacement detection in optical tweezers.png)
OPTICS LETTERS
OPTICS LETTERSIF3.3
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