Measurements have been made of the 525 nm re gion (green) light transmission through suspensions of silica in a liquid fluorocarbon. Transmission dropped when electrostatic field strengths up to 1350 V/mm were applied perpendicular to the light path, but no drop was detected for fields parallel to the light path. The transmission drop did not depend on incident polarization. We observed that an ER fluid changes the polarization of transmitted light with and without an applied electric field, but we were unable to resolve the dependence on the electric field.
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