Numerical Simulation on Periodic Metal/Dielectric Structures Using Plane-Wave-Assisted Boundary Integral-Equation Method
Date Issued
2007
Date
2007
Author(s)
Wang, Jyh-Yang
DOI
en-US
Abstract
A novel hybrid numerical technique is proposed for analyzing general 2D electromagnetic problems with 1D gratings. The proposed method combines the conventional boundary integral-equation method (BIEM) with the plane-wave-expansion technique, taking the benefit from either method. In the framework of the proposed method, the BIEM is in charge of formulating the major part of the problem containing the grating structure, while the plane-wave expansion is for describing the nature of the outgoing wave and truncating the computation domain in the direction perpendicular to the grating extension. The free space Green’s function with the periodic boundary condition is used to replace the commonly used periodic Green’s function for dealing with the periodicity of the problem. This circumvents the convergence difficulty of the periodic Green’s function. The performance of the PW-BIEM with the non-uniform mesh is also verified, showing the capability of the PW-BIEM in modeling the grating structure with fine geometry. With the proposed method, the transmission behavior of the wavy layered structure with a substrate-metal-cover-air architecture is investigated. The enhanced transmission due to the mechanism of the coupled surface plasmon polariton (SPP) is discussed and compared with another enhancement mechanism, cavity resonance effect, of the slit grating. For slit gratings, in addition to that of the rectangular type, the modified slit gratings are also simulated. The transmission behavior is discussed and interpreted.
Subjects
平面波展開
積分方程法
表面電漿子
plane-wave expansion
boundary integral-equation method
surface plasmon polariton
Type
thesis
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