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Single negative materials are artificial or natural media in which only one of the fundamental electromagnetic parameters is negative. If the permittivity ε is negative while permeability μ is positive, the material is called epsilon-negative, as seen in plasmas and noble metals at optical frequencies. If μ is negative and ε is positive, the material is called mu-negative, which can be realized using engineered nanostructures such ________ ________ ___ _________ __________ ___ ______ _____ ____ __________ __________ ______.
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