Open AccessMonostatic lidar/radar invisibility using coated spheres
Author(s) -
Peng-Wang Zhai,
Yu You,
George W. Kattawar,
Ping Yang
Publication year - 2008
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.001431
Subject(s) - spheres , mie scattering , optics , refractive index , scattering , physics , geometrical optics , backscatter (email) , spherical shell , light scattering , cloak , shell (structure) , materials science , metamaterial , telecommunications , composite material , astronomy , computer science , wireless
The Lorenz-Mie theory is revisited to explicitly include materials whose permeability is different from unity. The expansion coefficients of the scattered field are given for light scattering by both homogeneous and coated spheres. It is shown that the backscatter is exactly zero if the impedance of the spherical particles is equal to the intrinsic impedance of the surrounding medium. If spherical particles are sufficiently large, the zero backscatter can be explained as impedance matching using the asymptotic expression for the radar backscattering cross section. In the case of a coated sphere, the shell can be regarded as a cloak if the product of the thickness and the imaginary part of the refractive index of the outer shell is large.