Cloaking Device Physics
scattering suppression · plasmonic · carpet cloak
Cloak strategy
Transformation optics
Plasmonic cancellation
Carpet/ground-plane cloak
Object size (relative)
0.80
Frequency (normalized)
ω = 1.00
Physics:
Three cloaking strategies: (1) Transformation optics (Pendry/Leonhardt 2006): reroute fields around object with graded anisotropic metamaterial; RCS → 0 at design frequency. (2) Scattering cancellation (Alù 2005): plasmonic shell with opposite polarizability cancels scatterer's dipole moment; broadband but limited to small objects. (3) Carpet/ground-plane cloak: hide a bump on a reflective surface using simpler isotropic graded-index material; Li & Pendry 2008. Radar cross-section σ = 4πr²|E_s/E_i|². Passive cloaks obey causal constraints limiting bandwidth. Ocean wave cloaking demonstrated (Farhat 2012); seismic wave cloaking (Brûlé 2014).