Developing Parallel 3D FDTD Numerical Models for Studying Fishnet Structure Metamaterials and Metal Nano-Particles

• Main Authors: Chun-Ti Lu, 魯珺地
• Other Authors: 張宏鈞
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/56123607911176597157

碩士 === 國立臺灣大學 === 光電工程學研究所 === 100 === In this thesis, a parallelized three-dimensional (3D) finite-difference time-domain (FDTD) method numerical simulator is developed by using the message passing interface (MPI) library coded in C++ language. The capabilities of the simulator are than demonstrated by studying two topics in metamaterials and plasmonics, respectively. The transmission/reflection spectra of metamaterial magnetic resonators with different parameters are calculated and a right-angled triangular prism is numerically designed to observe the negative-refractive-index properties of fishnet structure. For plasmonics, the spectra of total cross sections and the near fields of silver nano particles of different shapes including cubes, sphere-pairs, and nano plates, are investigated. It is shown that the phasor amplitude is larger when the wavelength is at the absorption-cross-section peak rather than the scattering-cross-section peak for the case of cubes. The FDTD obtained results are compared with those based on the pseudospectral time-domain (PSTD) method calculation. For the nano-plates, plate length along the incident electric polarization direction is found to be strongly correlated with the resonant wavelength for waves normally incident on the parallel plates.