NEGATIVELY REFRACTIVE CHIRAL METAMATERIALS. “Chirality extends the class of negatively refracting metamaterials by endowing a richer palette of electromagnetic properties. Millions of research dollars have been spent during the last decade on this topic, following experimental reports of negative refraction in certain metamaterials under microwave illumination…negative refraction is not exclusive to artificial metamaterials: certain biological structures and naturally occurring minerals also exhibit negative refraction.”
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