【摘要】：隨著科學(xué)技術(shù)的飛速發(fā)展,人們對元器件的集成化程度和信息處理速度要求越來越高。傳統(tǒng)的電子元件在數(shù)字信息的存儲和處理速度方面越來越不能滿足人們的需求,而光子元件具有高帶寬、高速度和低損耗等優(yōu)勢,因此用光子代替電子來傳遞信息的想法得到廣泛關(guān)注。然而由于衍射極限的限制,傳統(tǒng)光學(xué)器件的尺寸在微米量級,難以實(shí)現(xiàn)光電子器件在納米尺度的高度集成。近年來大量的理論研究發(fā)現(xiàn)基于表面等離子體激元的光波導(dǎo)器件成為解決這一難題的有效途徑,它不但能克服傳統(tǒng)光學(xué)器件中存在的衍射極限的限制,還可以把電磁場模式束縛在亞波長尺度,滿足了光電子器件的微型化和高密度集成化的需求。本文首先分析了金屬介電常數(shù)的Drude模型,然后介紹了表面等離子體激元及表面等離子體光波導(dǎo)的基礎(chǔ)知識,包括基礎(chǔ)理論、色散特性、特性參數(shù)和激發(fā)方式等；同時(shí)對研究表面等離子體光波導(dǎo)傳輸特性的數(shù)值計(jì)算方法做了簡單介紹。最后我們提出一種新型的由金屬-介質(zhì)-金屬納米線組成的表面等離子體光波導(dǎo),并詳細(xì)研究了其傳輸特性及串?dāng)_特性。下面是本文的重點(diǎn)研究內(nèi)容：1、本文設(shè)計(jì)了一種新型的金屬-介質(zhì)-金屬納米線并排放置的表面等離子體光波導(dǎo)。利用COMSOL Multiphysics軟件對電磁場模式分布特性和傳輸特性進(jìn)行了分析,討論了幾何參數(shù)對其所支持的電磁場模式特性的影響。結(jié)果表明電磁場模式主要分布在金屬和介質(zhì)納米線之間的間隙之中,通過改變金屬和介質(zhì)納米線半徑的大小以及其間隙的寬度等參數(shù)可以調(diào)節(jié)電磁場模式的分布特性、傳輸長度和束縛特性。2、由于制作工藝的限制,在制作光波導(dǎo)的過程中難免會引起一定程度的制作誤差,為了研究我們所提出光波導(dǎo)對制作誤差是否有較高的兼容和適應(yīng)性,我們對光波導(dǎo)的幾何結(jié)構(gòu)進(jìn)行了輕微改變,重新對電磁場模式的分布特性和傳輸特性進(jìn)行了詳細(xì)的研究。通過對比研究發(fā)現(xiàn)我們所提出的光波導(dǎo)對制作誤差有較高的兼容和適應(yīng)性,在實(shí)際應(yīng)用中有一定的應(yīng)用價(jià)值。3、在高密度集成光學(xué)器件中,電磁場模式在相鄰光波中傳輸時(shí)會發(fā)生模式串?dāng)_,從而使高密度集成受到限制。因此我們又對所提出的光波導(dǎo)的模式串?dāng)_特性進(jìn)行了分析,結(jié)果表明該光波導(dǎo)模式間發(fā)生串?dāng)_的幾率非常小,可以應(yīng)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.
【學(xué)位授予單位】：山西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN252

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 賈智鑫;段欣;呂婷婷;郭亞楠;薛文瑞;;領(lǐng)結(jié)形中空表面等離子體波導(dǎo)的傳輸特性[J];物理學(xué)報(bào);2011年05期

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本文編號：2449621