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The Quest for Ultimate Electromagnetics using Spatial Transformations (QUEST)
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Paper on removing zeros and singularities from transformed media
A paper "Transmutation of singularities and zeros in graded index optical instruments: a methodology for designing practical devices" has been published in the journal Optics Express. This paper, by QUEST members Ian Hooper and Tom Philbin, describes methods for modifying spatial transformations to avoid zero and infinite-valued points, which produce unrealistic or even unrealizable materials.