Abstract
We report a micro-electro-mechanical system tunable cat's eye retroreflector array for optical identification. A rotational concave mirror is employed in the retroreflector to achieve modulability of the retroreflected optical intensity. The magnetic force between the permanent magnet and magnetic beads on the rotatable concave mirror unit enables magnetic actuation and accomplishes modulation. The magnetically actuated mirror achieves a large tilt angle. The tilt angle of the concave mirror can change from 0° to 12°, with the retroreflection efficiency varying from 19% to 5% correspondingly. The retroreflection efficiency versus the position of the permanent magnet is characterized. A dynamic image can be generated by applying magnetic force individually to each cat's eye in the array.
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