Effects of size and frequency dispersion in plasmonic cloaking

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Date

2008-10

Authors

Alu, Andrea
Engheta, Nader

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Abstract

The plasmonic venue to realize invisibility and cloaking [A. Alu and N. Engheta, Phys. Rev. E 72, 016623 (2005)] is analyzed here in terms of its limitations and its frequency dispersion relative to the cloak size. Intrinsic limits due to causality and comparison with transformation-based cloaking techniques are discussed and analyzed. An interestingly simple low-dispersion cloak is also suggested for background materials with larger refractive index. These results may shed light on this scattering cancellation phenomenon, suggesting potential applications in scattering reduction and noninvasive probing.

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Alu, Andrea, and Nader Engheta. "Effects of size and frequency dispersion in plasmonic cloaking." Physical review E 78, no. 4 (2008): 045602.