Zero-backscatter cloak for aspherical particles using a generalized DDA formalism.
The Discrete Dipole Approximation (DDA) formalism has been generalized to materials with permeabilities mu; not equal 1 to study the scattering properties of impedance-matched aspherical particles and cloaked spheres. We have shown analytically that any impedance-matched particle with a four-fold rotational symmetry with respect to the direction of the incident radiation has the feature of zero backscatter. Moreover, an impedance-matched coat with the aforementioned symmetry property acting on an irregular dielectric particle with the same symmetry property can substantially reduce the backscatter. This leads to a substantial reduction of the signals from an object being detected by a monostatic radar/lidar system. The DDA simulation also provides accurate information about electric field distributions in the vicinity of a cloaked sphere.
1Department of Physics, Texas A&M University, College Station, TX, 77843, USA.
Yu
Y
You
George W
GW
Kattawar
Peng-Wang
PW
Zhai
Ping
P
Yang
D003198:Computer Simulation; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D010316:Particle Size; D011825:Radar; D011874:Radiometry / Q000379:methods*; D012542:Scattering, Radiation; D012637:Security Measures