Do Cloaked Objects Really Scatter Less?

Do Cloaked Objects Really Scatter Less?

Blog Article

We discuss the global scattering response of invisibility cloaks Cover Ups over the entire electromagnetic spectrum, from static to very high frequencies.Based on linearity, causality, and energy conservation, we show that the total extinction and scattering, integrated over all wavelengths, of any linear, passive, causal, and nondiamagnetic cloak, necessarily increase compared to the uncloaked case.In light of this general principle, we provide a quantitative measure to compare the global performance of different cloaking techniques and we discuss solutions to minimize the global scattering signature of Curling - Gloves an object using thin, superconducting shells.

Our results provide important physical insights on how invisibility cloaks operate and affect the global scattering of an object, suggesting ways to defeat countermeasures aimed at detecting cloaked objects using short impinging pulses.