Chih-chieh Chang, Yu-cheng Yang, Ming-chun Su, J. Tsai
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Characterization of a micro tunable cat's eye array in an optical identification system and comparison between different types of ID tags
We have built an optical identification system, and tried different types of dynamic ID tags, including a tunable cat's eye retroreflector array, a liquid crystal (LC) spatial light modulator (SPM) with retroreflective tape, and a LC SPM with normal white paper. Their performance is compared and the tag implemented with the micro tunable cat's eye retroreflector array offers the best system security.