Analysis of Three-Dimensional Nanoantenna Arrays Using the Parallelized Finite-Difference Time-Domain Method
Date Issued
2014
Date
2014
Author(s)
Chang, Yu-Ping
Abstract
The finite-difference time-domain method (FDTD) has been widely used in computational electromagnetics. We construct a parallelized three-dimensional (3-D) FDTD simulator in C++ language. The message passing interface (MPI) protocol is applied in our simulator for using several computers in the computation in order to speed up the process and shorten the simulation time.
In this research, the main topic is to analyze nanoantenna arrays having bowtie and dipole structures. We investigate two kinds of bowtie structures: the equilateral-triangle bowtie and the modified bowtie. The modified bowtie is a correction of the equilateral-triangle bowtie with the head-to-head apexes being flattened. It is more effective to confine the field within the antenna gap and increase the field enhancement. We first simulate the traditional solid bowtie arrays with a broadband source. The local field enhancement in the antenna gap is calculated, including the broadband responses and the resonant wavelengths. Then the contour bowtie nanoantenna arrays aiming at miniaturization are simulated. Contour bowtie structures has longer resonant wavelengths than the solid structures under the same circumstance. The most important discovery is that the period lengths of the array are very crucial parameters. The array period length is perpendicular to the broadside of the bowtie and dipole shapes influences the resonant wavelength in the enhancement spectrum primarily. The resonant wavelength seems to be a function of the period length. This phenomenon can be seen in both solid and contour structures.
Subjects
時域有限差分法
表面電漿子
奈米天線
奈米天線陣列
Type
thesis
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