Abstract
This study has developed an independently-addressed tunable cat's eye retroreflector array for an
optical identification system. Switchable cat's eye retroreflectors are achieved by incorporating polymer
dispersed liquid crystal film and indium tin oxide (ITO) electrodes into the cat's eye structure. Experiments
show that the gap between the front and back units of the cat's eye retroreflector plays a role in the optical
performance of the device. The second-generation device is used to realize the optical ID tag. By controlling the
ON–OFF state of each pixel, the tunable optical device can generate a dynamic image which carries temporal and
spatial codes for the purpose of identification. The ID tag (cat's eye retroreflector array) can operate at two
orientations.
© 2013 IEEE
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