Study On The Propagation Properties Of Electromagnetic Field Mode Of A Surface Plasmonic Waveguide Formed Of Metal-Dielectric- Metal Nanowires

Nowadays, the information technology has rapid growth in the different areas of our daily life. The needs of information processing speed and high density devices integration is becoming more and more urgent. People are not satisfied with the digital information storage and processing speed of traditional electronic circuits. Because of the advantages of photonic components such as wide broadband, high speed, low loss and so on, the idea of replacing the electronic circuits with photonic ones get more and more attention. It is difficult to achieve high density integration using traditional electronic or photonic circuits because of the diffraction limits. Resent study revealed that nano photonic devices based on surface plasmon polaritions become the effective way to solve this problem. It could not only break the diffraction limit, but also could confine the electromagnetic field mode to the scale of subwavelength.In this dissertation, at first we give the Drude model of noble metals. Secondly we give the introduction of surface plasmon polaritions and surface plasmonic waveguide as well as the physics parameters describing the electromagnetic field mode propagation properties and numerical simulation method. Thirdly the main content is divided into three parts as follows:(1) We propose a kind of surface plasmon metal-dielectric-metal nanowire array waveguide. The dependence of the propagation properties of fundamental mode on waveguide’s geometry parameters were analyzed using COMSOL. The results show that the energy flux density of fundamental mode mainly distributed in the gap between dielectric and metal nano wires. Better mode confinement and propagation length can be achieved by adjusting the waveguide’s geometry parameters.(2) To study the effects of manufacture error tolerance on the mode propagation properties, we have made a new round of numerical simulation by slightly changing the geometry structures of the proposed waveguide.Firstly, the nanowires are not arranged in a straight line and secondly, the cross-sections of the nanowires are changed as elliptical. Comparison results revealed that our proposed surface plasmonic waveguide has higher tolerance to the manufacture errors, because the slight changes of geometry parameters have also slight effects on the mode propagation properties. So, we may think that our proposed surface plasmonic waveguide is of valuable in potential applications.(3) During the high density photonic devices integration, it is inevitably has crosstalk between two neighboring waveguide and thus leading to the limitation of real applications. In this article, we have also investigated the effect of the space of two neighboring waveguide on the mode crosstalk. Simulation results show that the mode coupled length is larger than the mode propagation length and then the probability of mode crosstalk is very small. This advantage is needed for the future compact integration of photonic devices.