Journal
OPTICS EXPRESS
Volume 17, Issue 18, Pages 16135-16143Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.016135
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We report the design and experimental measurement of a powered active magnetic metamaterial with tunable permeability. The unit cell is based on the combination of an embedded radiofrequency amplifier and a tunable phase shifter, which together control the response of the medium. The measurements show that a negative permeability metamaterial with zero loss or even gain can be achieved through an array of such metamaterial cells. This kind of active metamaterial can find use in applications that are performance limited due to material losses. (C) 2009 Optical Society of America
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