Journal
OPTICS EXPRESS
Volume 16, Issue 19, Pages 14655-14660Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.014655
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Funding
- ONR [N00014-01-1-0713]
- the Department of the Air Force under Air Force [F19628-00-C-0002]
- Chinese NSF [60531020]
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We studied the scattering from the simplified cylindrical cloaks analytically at both normal and oblique incidences. We found that these simplified cylindrical cloaks may produce a larger scattering at nonnormal incidences than that from an object without any cloak, making this object more visible. Even at normal incidence, the high-order transformation with impedance matched at the outer boundary can produce stronger scattering than the linear simplified one without matched impedance. This is due to the inefficiency of guided waves close to the inner boundary. Therefore, a square root transformation can improve scattering by guiding waves away from the inner boundary. (C) 2008 Optical Society of America.
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