Open AccessZero-backscatter cloak for aspherical particles using a generalized DDA formalism
Author(s) -
Yu You,
George W. Kattawar,
Peng-Wang Zhai,
Ping Yang
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.002068
Subject(s) - physics , optics , spheres , discrete dipole approximation , cloak , scattering , backscatter (email) , dielectric , mie scattering , electric field , dipole , computational physics , light scattering , metamaterial , classical mechanics , quantum mechanics , computer science , telecommunications , astronomy , wireless
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.