Models of electromagnetic properties of composite media
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Abstract
Electromagnetic composite materials have
attracted much interest in recent years, due to their desirable
microwave and optical applications. One class of these is negative
refractive index materials, or double negative materials, in which
both permittivity and permeability of materials are simultaneously
negative. Many exciting potential applications of double negative
materials have been proposed, such as the perfect lens and the
cloaking device. Here, a simple-cubic lattice of identical,
homogeneous or coated non-metallic spherical particles embedded in a
matrix is analyzed. One contribution of this work is the derivation
of an analytical formula for the threshold dielectric loss angle of
spherical inclusions, above which DNG behavior of the system is
extinguished. In addition, analytical formulas are derived from
which double negative bandwidth of a simple-cubic lattice of
identical, magnetodielectric homogeneous or coated spheres can be
determined.
Another case of interest is nanocomposites, which commonly consist
of nanoparticles embedded in a polymer matrix. These materials show
superior dielectric or mechanical performance by taking advantage of
the merits of their individual non-hybrid components. In one
manifestation, diblock copolymers can be utilized to spatially
separate nanoparticles by incorporating them in one block,
preferentially, to form a long-range ordered structure. By designing
this structure, the electromagnetic properties can be tailored for
potential applications in novel devices. Here, molecular dynamics of
polymer matrices and nanocomposites is analyzed by parametric
modeling of their dielectric spectra, supporting design of a
composite with desired electromagnetic properties.