Andrea Alù and Nader Engheta 2008 New J. Phys. 10 115036 doi:10.1088/1367-2630/10/11/115036
Theory and potentials of multi-layered plasmonic covers for multi-frequency cloaking
Focus on Cloaking and Transformation OpticsAndrea Alù1,2 and Nader Engheta1
Show affiliationsPart of Focus on Cloaking and Transformation Optics
We have recently suggested that suitably designed plasmonic layers may cloak a given object simultaneously at multiple frequencies (Alù and Engheta 2008 Phys. Rev. Lett. 100 113901). Here, we extend our theory and fully analyze this possibility, highlighting the potentials of this plasmonic cloaking technique and its fundamental limitations dictated by the passivity and causality of the materials involved. The cloaking mechanism relies on the scattering cancellation properties of plasmonic materials. By exploiting their inherent frequency dispersion, it is possible to reduce the 'visibility' of a given object by several orders of magnitude simultaneously at multiple frequencies, such that any of the particular layers composing the cloak is responsible for noticeable reduction of scattering at each frequency of operation.
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Issue 11 (November 2008)
Received 16 July 2008
Published 27 November 2008
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Theory and potentials of multi-layered plasmonic covers for multi-frequency cloaking
Andrea Alù and Nader Engheta 2008 New J. Phys. 10 115036
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