Departmental Papers (ESE)


The plasmonic venue to realize invisibility and cloaking [A. Alù 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.

Document Type

Journal Article

Date of this Version

October 2008


Copyright American Physical Society. Reprinted from Physical Review E, Volume 78, Issue 4, Article 045602(R), October 2008.
Publisher URL:


metamaterials, optical dispersion, plasmons, refractive index



Date Posted: 11 December 2008

This document has been peer reviewed.