The superprism effect has been studied in the past by use of the anomalous group velocities of optical waves in photonic crystals. We suggest the possibility of realizing agile beam steering based on purely phase-velocity effects. We present designs of photonic crystal prisms that might make experimental observation of this effect possible.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/15072378