| Summary: | 碩士 === 國立中央大學 === 光電科學與工程學系 === 101 === In this thesis we adopt the Z-transform assisted Finite-difference time domain (FDTD) method to simulate the wave packet propagating behavior in the artificial structure which composed with periodically arranged thin metallic wires and spilt-ring resonators (SRRs). This artificial medium has dispersive permittivity like that of Drude model and dispersive permeability like that of Lorentz model, and has negative refractive index in a range of frequency. The main theme of our study is about the propagating behaviors of electromagnetic waves in this medium in the negative refraction frequency range. We study and discuss the differences among wave packet velocity, group velocity, and energy velocity in lossless and absorptive medium respectively. Finally, we compare the energy transmittance and refractive performance of wave packet with that of the monochromatic waves.
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