The Study Of Resonant Properties In Metal Nano Resonance Cavities

Since the phenomena of extraordinary transmission of light through an array of sub-wavelength holes has been reported by Ebbesen et al.in 1998, its remarkable properties, which allow light transmitting below the diffraction and localizing light energy in a nano-scale domain, attract more and more researchers to throw themselves into this field. At present, though there is not a clearly conclusion of physical mechanism about this phenomena, researchers empolder many optical devices with sub-wavelength structure based on its properties. Moreover all kinds of nano photonic devices based on surface plasmon polaritons are considered the base to achieve the integration of all photon. Metal nano resonant cavity is the pivotal apparatus to achieve novel laser of microminiature. Because the metal film etched with gratings can enhance the amplitude and break the diffraction limits, we design two metal films with periodic gratings which are setted front to front in order to achieve super-small facula and ehance the amplitude of field and then to explore the physical mechanism of cavity.This paper is based on boundary elements method to analyze the resonant properties and the properties of localizing light energy in a nano-scale domain of the metal nanocavities with different disfigurements. To our present knowledge, it is the first time to research the metal nanocavity embedded elliptical disfigurement in it. The main conclusions of this paper contain:[1] For the metal nanocavity with periodic sine structure, we have investigated its resonant properties. We find that the numbers of wave peaks increase and drift to the Einstein shift as the numbers of periodic sine increase. Besides, we discover that the values of the resonant peaks decrease and the resonant wavelength move to the short wavelength while the distance of the two parts of cavity is augmented. And the resonant wavelength shifts to the long wavelength with linearity when we increase the amplitude of sine.[2] For the metal nanocavity embedded embossment structure with beeline disfigurement in the center of embossment, we have analyzed its resonant properties. Combining with the results that got before and positive and negative data, we show that surface plasmon polaritons are a kind of wave that propagate along the surface and its propagation properties are related with the property of surface structure and are liable to be influenced bythe structure. [3] For the innovative nanocavity embeded ellipse configuration, we make the light energy localize in a nano-scale domain in the nanocavity and enhance the amplitude more than twenty times than the amplitude of incidence light by researching the properties of cavity. Besides, we find the way to optimize the structure of the nanocavity by changing the parameters of itThe study of this thesis can provide important technical parameters to design novel laser of microminiature.