Study of Several Nano-Antenna Structures Using the Parallelized Finite-Difference Time-Domain Method
Date Issued
2015
Date
2015
Author(s)
Chen, Yu-Tsung
Abstract
The Finite-difference time-domain (FDTD) method has been widely used in computational electromagnetics. In this research, a parallelized three-dimensional (3D) FDTD simulator in C language is constructed and several computers are combined to speed-up the simulations by using the message passing interface (MPI) protocol. Then, the simulator is employed to study nano-antennas including the cross-pair antenna, the modified cross-pair antenna, the trident-pair antenna, and the spiral antenna. The antennas are simulated with a broadband source. The local field enhancement in the antenna gap is calculated, including the broadband responses and the resonant wavelengths. Then, three different arrangements of two- and four- element arrays are simulated. The most important finding is that the wing length at the antenna gap will make the resonant wavelength red-shift. By varying the wing length, the resonant wavelengths of the modified cross-pair, the trident, and the spiral antenna can be increased by 60%, 52%, and 16%, respectively. The spiral antenna seems to possess larger gap enhancement and resonant wavelength than the cross-pair, the trident-pair, and the modified cross-pair with the same antenna size (450 X 450 nm2). Thus, the spiral antenna has the advantages of reducing the antenna footprint without decreasing too much in the gap enhancement and resonant wavelength.
Subjects
FDTD method
surface plasmons
nana-antennas
nano-antenna arrays
Type
thesis
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