金属—介质—金属纳米线表面等离子体光波导中电磁场模式传输特性研究
发布时间：2019-03-29 14:15
【摘要】：随着科学技术的飞速发展,人们对元器件的集成化程度和信息处理速度要求越来越高。传统的电子元件在数字信息的存储和处理速度方面越来越不能满足人们的需求,而光子元件具有高带宽、高速度和低损耗等优势,因此用光子代替电子来传递信息的想法得到广泛关注。然而由于衍射极限的限制,传统光学器件的尺寸在微米量级,难以实现光电子器件在纳米尺度的高度集成。近年来大量的理论研究发现基于表面等离子体激元的光波导器件成为解决这一难题的有效途径,它不但能克服传统光学器件中存在的衍射极限的限制,还可以把电磁场模式束缚在亚波长尺度,满足了光电子器件的微型化和高密度集成化的需求。本文首先分析了金属介电常数的Drude模型,然后介绍了表面等离子体激元及表面等离子体光波导的基础知识,包括基础理论、色散特性、特性参数和激发方式等；同时对研究表面等离子体光波导传输特性的数值计算方法做了简单介绍。最后我们提出一种新型的由金属-介质-金属纳米线组成的表面等离子体光波导,并详细研究了其传输特性及串扰特性。下面是本文的重点研究内容：1、本文设计了一种新型的金属-介质-金属纳米线并排放置的表面等离子体光波导。利用COMSOL Multiphysics软件对电磁场模式分布特性和传输特性进行了分析,讨论了几何参数对其所支持的电磁场模式特性的影响。结果表明电磁场模式主要分布在金属和介质纳米线之间的间隙之中,通过改变金属和介质纳米线半径的大小以及其间隙的宽度等参数可以调节电磁场模式的分布特性、传输长度和束缚特性。2、由于制作工艺的限制,在制作光波导的过程中难免会引起一定程度的制作误差,为了研究我们所提出光波导对制作误差是否有较高的兼容和适应性,我们对光波导的几何结构进行了轻微改变,重新对电磁场模式的分布特性和传输特性进行了详细的研究。通过对比研究发现我们所提出的光波导对制作误差有较高的兼容和适应性,在实际应用中有一定的应用价值。3、在高密度集成光学器件中,电磁场模式在相邻光波中传输时会发生模式串扰,从而使高密度集成受到限制。因此我们又对所提出的光波导的模式串扰特性进行了分析,结果表明该光波导模式间发生串扰的几率非常小,可以应用于高密度光子器件的集成。
[Abstract]:With the rapid development of science and technology, people's integration degree and speed of information processing are getting higher and higher. Traditional electronic components are more and more difficult to meet the needs of people in the storage and processing speed of digital information, and the photonic components have the advantages of high bandwidth, high speed and low loss, so the idea of using photons to replace the electronic to transfer information is widely concerned. However, due to the limitation of the diffraction limit, the size of the conventional optical device is on the order of micrometers, and it is difficult to achieve a high degree of integration of the optoelectronic device in the nano-scale. In recent years, a large number of theoretical studies have found that the optical waveguide device based on surface plasmon is an effective way to solve the problem, not only can overcome the limitation of the diffraction limit existing in the conventional optical device, but also can bind the electromagnetic field mode to the sub-wavelength scale, And the requirement of miniaturization and high-density integration of the optoelectronic device is met. In this paper, the Drude model of metal dielectric constant is first analyzed, then the basic knowledge of the surface plasma exciting and surface plasma optical waveguide is introduced, including the basic theory, the dispersion characteristic, the characteristic parameter and the excitation mode, etc. At the same time, the numerical calculation method of the transmission characteristics of the surface plasma optical waveguide is introduced briefly. In the end, we present a new surface plasma optical waveguide composed of metal-dielectric-metal nanowires, and the characteristics of its transmission and cross-talk are studied in detail. The following is the focus of this paper:1. A new metal-dielectric-metal nanowire is designed in a side-by-side surface plasma optical waveguide. The distribution and transmission characteristics of the electromagnetic field are analyzed by the COMSOL Multiphysics software, and the influence of the geometric parameters on the characteristics of the electromagnetic field is discussed. The results show that the electromagnetic field pattern is mainly distributed among the gaps between the metal and the medium nanowires, and the distribution characteristics, the transmission length and the binding characteristics of the electromagnetic field mode can be adjusted by changing the size of the radius of the metal and the medium nanowire and the width of the gap. due to the limitation of the manufacturing process, a certain degree of manufacturing error can be avoided in the process of manufacturing the optical waveguide, and in order to study whether the optical waveguide has higher compatibility and adaptability to the manufacturing error, the geometrical structure of the optical waveguide is slightly changed, The distribution and transmission characteristics of the electromagnetic field are studied in detail. Through the comparative study, it is found that the proposed optical waveguide has a high compatibility and adaptability to the manufacturing error, and has a certain application value in the practical application. So that the high-density integration is limited. Therefore, the mode crosstalk characteristic of the proposed optical waveguide is analyzed, and the result shows that the probability of cross-talk between the optical waveguide modes is very small, which can be applied to the integration of high-density photonic devices.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN252
本文编号：2449621
[Abstract]:With the rapid development of science and technology, people's integration degree and speed of information processing are getting higher and higher. Traditional electronic components are more and more difficult to meet the needs of people in the storage and processing speed of digital information, and the photonic components have the advantages of high bandwidth, high speed and low loss, so the idea of using photons to replace the electronic to transfer information is widely concerned. However, due to the limitation of the diffraction limit, the size of the conventional optical device is on the order of micrometers, and it is difficult to achieve a high degree of integration of the optoelectronic device in the nano-scale. In recent years, a large number of theoretical studies have found that the optical waveguide device based on surface plasmon is an effective way to solve the problem, not only can overcome the limitation of the diffraction limit existing in the conventional optical device, but also can bind the electromagnetic field mode to the sub-wavelength scale, And the requirement of miniaturization and high-density integration of the optoelectronic device is met. In this paper, the Drude model of metal dielectric constant is first analyzed, then the basic knowledge of the surface plasma exciting and surface plasma optical waveguide is introduced, including the basic theory, the dispersion characteristic, the characteristic parameter and the excitation mode, etc. At the same time, the numerical calculation method of the transmission characteristics of the surface plasma optical waveguide is introduced briefly. In the end, we present a new surface plasma optical waveguide composed of metal-dielectric-metal nanowires, and the characteristics of its transmission and cross-talk are studied in detail. The following is the focus of this paper:1. A new metal-dielectric-metal nanowire is designed in a side-by-side surface plasma optical waveguide. The distribution and transmission characteristics of the electromagnetic field are analyzed by the COMSOL Multiphysics software, and the influence of the geometric parameters on the characteristics of the electromagnetic field is discussed. The results show that the electromagnetic field pattern is mainly distributed among the gaps between the metal and the medium nanowires, and the distribution characteristics, the transmission length and the binding characteristics of the electromagnetic field mode can be adjusted by changing the size of the radius of the metal and the medium nanowire and the width of the gap. due to the limitation of the manufacturing process, a certain degree of manufacturing error can be avoided in the process of manufacturing the optical waveguide, and in order to study whether the optical waveguide has higher compatibility and adaptability to the manufacturing error, the geometrical structure of the optical waveguide is slightly changed, The distribution and transmission characteristics of the electromagnetic field are studied in detail. Through the comparative study, it is found that the proposed optical waveguide has a high compatibility and adaptability to the manufacturing error, and has a certain application value in the practical application. So that the high-density integration is limited. Therefore, the mode crosstalk characteristic of the proposed optical waveguide is analyzed, and the result shows that the probability of cross-talk between the optical waveguide modes is very small, which can be applied to the integration of high-density photonic devices.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN252
【参考文献】
相关期刊论文 前1条
1 贾智鑫;段欣;吕婷婷;郭亚楠;薛文瑞;;领结形中空表面等离子体波导的传输特性[J];物理学报;2011年05期
，本文编号：2449621
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