Physical Origin Of Extraordinary Transmission Phenomenon Through Sub-wavelength Metallic Optical Device

The physical origin of Extraordinary Optical Transmission (EOT) has received much attention since the phenomenon of EOT was discovered. The arguments still continue, and it is a hot topic at present. It is important and significant to find the underlying physical origin for further designs and applications of various metallic micro-optical elements.In this thesis, a simple and classic model is developed to study the physical mechanism of EOT phenomenon. It is based on rigorous electromagnetic field theory, to simulate the distribution of optical transmission field and the reflect field veraciously by applying the Boundary Element Method (BEM). It is the first time to separate the SPP and the diffraction field from total scattering field by the Spectrum analysis Method. The contents include:1. For the first time, Spectral analysis method (Fourier transform) are used to analyze the structure of the single-slit and the separate the CDEW and the SPP from the reflection field and the transmission field. We calculate the scattering field distribution of single-slot structure, and obtain the efforts of the CDEW and the SPP respectively. The CDEW and the SPP field distribution are analyzed as well.2. The influences of the groove width and the distance between groove and slit on the EOT, and optical field distribution are investigated, and the optical field distributions of the reflected and transmitted ware are analyzed.