Invisibility cloak with photonic crystals
Date Issued
2014
Date
2014
Author(s)
Yeh, Hsiu-Chih
Abstract
Transformation optics has shown taht the ability to cloak an object from
incident electromagnetic radiation is theoretically possible. However, the
constitutive parameters dictated by the theory are inhomogeneous, anisotropic,
and, in some instances, singular at various locations. In order for a cloak to
be practically realized, simplified parameter sets are required. However, the
simplified parameters result in a degradation in the cloaking function. Constitutive
parameters for simplified two-dimensional cylindrical cloaks have been
developed and are divided into two categories based on the spatial dependence
which represnets the feasibility of practical implementation. Comparing the
proposed simplified parameter in the literature, there is a tradeoff between the
performance and the possibility for implementation.
In this thesis, we design a simplified invisibility cloak operating in the
visible light spectrum giving consideration to both the performance and the
possibility for implementation. The design is a combinaiton of the simplified
parameter by considering impedance match and the photonic crystal structure.
During the course of this study, it was noted that all cloak simulations
are performed using finite element method (FEM) based numerical methods.
In the comparisons with the proposed parameter under the designed PC structure,
we compare forward scattering, backward scattering, and scattering in
all directions with far field and near field condition respectively. Simulation
results illustrate that our design takes into account both the performance and
the possibility for implementation in practical in the visible light spectrum.
Subjects
光子晶體
隱型斗篷
有限元素法
Type
thesis
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