Known metamaterial-based ``invisibility cloaks'' have been observed to work only for narrow ranges of electromagnetic waves, for example, making an object invisible to red light, but highly visible to blue light. With a comprehensive and quantitative theoretical analysis, researchers now provide a concrete understanding of the observations and also propose a design for broadband cloaks using diamagnetic or superconducting thin cloaking layers.
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Monticone et al. (2013) studied this question.
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