Multifrequency Optical Invisibility Cloak with Layered Plasmonic Shells

Andrea Alù, University of Pennsylvania
Nader Engheta, University of Pennsylvania

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Copyright American Physical Society.
Reprinted in Physical Review Letters, Volume 100, Issue 11, Article 113901, March 2008, 4 pages.
Publisher URL: http://dx.doi.org/10.1103/PhysRevLett.100.113901

Abstract

Here, we theoretically suggest the possibility of employing a multilayered plasmonic shell as a cloak for reducing the total scattering cross section of a particle, simultaneously at different frequencies in the optical domain. By exploiting the frequency dispersion of plasmonic materials and their inherent negative polarizability, it is shown, theoretically and with numerical simulations, how covering a dielectric or conducting object of a certain size with this multilayered cloak may reduce its "visibility" by several orders of magnitude simultaneously at multiple frequencies.