【摘要】：受限于光學(xué)衍射極限,光子器件在小型化與集成化方面遭遇到前所未有的挑戰(zhàn),而表面等離激元(SPs)的出現(xiàn)為我們解決這一問題提供了有利途徑。根據(jù)傳輸性質(zhì)的不同,表面等離激元可分為表面等離極化激元(SPPs)和局域表面等離激元(LSPs)。通過在不同的金屬微結(jié)構(gòu)中激發(fā)SPPs或LSPs,不僅可滿足當(dāng)前光子器件對小型化與電光一體化的需求,也可實(shí)現(xiàn)許多具有新穎功能的光學(xué)效應(yīng)。本文基于金屬微結(jié)構(gòu)器件對SPPs和LSPs的光學(xué)性能及其外部調(diào)控進(jìn)行相關(guān)理論研究,設(shè)計(jì)了兩種可調(diào)控的微結(jié)構(gòu)器件。主要內(nèi)容有:1.對于傳統(tǒng)的光學(xué)器件,很難通過簡單的光學(xué)器件實(shí)現(xiàn)圓偏振片的功能。而手性材料由于其結(jié)構(gòu)的特殊性能夠獲得許多新穎的光學(xué)效應(yīng),例如:圓二向色性,不對稱透射,磁電耦合等。本文依據(jù)手性結(jié)構(gòu)對不同圓偏振光的響應(yīng)不同設(shè)計(jì)了一種3D金屬手性超材料。通過束縛態(tài)的電四極子與電偶極子的耦合,實(shí)現(xiàn)了亮亮模式的電磁誘導(dǎo)透明現(xiàn)象。此外,通過將手性引入結(jié)構(gòu),實(shí)現(xiàn)了左右旋圓偏振光選擇性激發(fā)電磁誘導(dǎo)透明現(xiàn)象,進(jìn)而為納米量級的圓偏振片的實(shí)現(xiàn)提供了理論可能。2.高效的、可集成的等離激元光源在未來的光子集成中將占具很重要的作用,而受限于現(xiàn)有的微加工技術(shù),實(shí)驗(yàn)上一直很難加工完成。在這里,結(jié)合石墨烯費(fèi)米能級的可調(diào)控特性,本文設(shè)計(jì)了一種石墨烯加載的不對稱金屬納米天線結(jié)構(gòu),實(shí)現(xiàn)了電控表面等離激元(SPPs)單向傳輸。相較于傳統(tǒng)的等離激元單向設(shè)備,該設(shè)備可以通過微調(diào)的方式來彌補(bǔ)實(shí)驗(yàn)上的誤差。同時(shí)還具有寬帶寬、單電壓調(diào)控、易于集成等優(yōu)點(diǎn)。這種可調(diào)諧的等離激元光源將在未來的光子集成與光電子學(xué)領(lǐng)域?qū)⒕哂兄匾膽?yīng)用價(jià)值。3.理論及實(shí)驗(yàn)上初步嘗試了如何利用SPPs較強(qiáng)的局域場特性實(shí)現(xiàn)高調(diào)制深度的石墨烯調(diào)制器,以及高響應(yīng)度的SPPs石墨烯探測器。根據(jù)石墨烯對SPPs縱向場不吸收而僅吸收橫向場的特點(diǎn),設(shè)計(jì)了一種波導(dǎo)陣列結(jié)構(gòu)將原有的SPPs場翻轉(zhuǎn),相較于已有的石墨烯SPPs的調(diào)制器,其調(diào)制深度提高了一個(gè)數(shù)量級,最后基于以上分析提出了一種石墨烯光探測結(jié)構(gòu)并對其進(jìn)行簡要的理論分析。
[Abstract]:Due to the limitation of optical diffraction, photonic devices face unprecedented challenges in miniaturization and integration, and the appearance of surface isophosphoric (SPs) provides us with a favorable approach to solve this problem. According to the different transport properties, the surface isophosphors can be divided into (SPPs) and (LSPs). By exciting SPPs or LSPs in different metal microstructures, we can not only meet the demand of miniaturization and electro-optic integration of photonic devices, but also realize many novel optical effects. Based on the theoretical study of the optical properties and external regulation of SPPs and LSPs, two kinds of adjustable microstructural devices are designed in this paper. The main content is: 1. For traditional optical devices, it is difficult to realize the function of circular polarizers by simple optical devices. Because of its special structure, chiral materials can obtain many novel optical effects, such as circular dichroism, asymmetric transmission, magnetoelectric coupling and so on. According to the response of chiral structure to different circular polarized light, a 3D metal chiral supermaterial was designed. The electromagnetically induced transparency in the bright mode is realized by coupling the electric quadrupole and the electric dipole in the bound state. In addition, by introducing chiral structure, the phenomenon of electromagnetically induced transparency induced by left and right rotatory circular polarized light is realized, which provides a theoretical possibility for the realization of nanoscale circular polarizers. The high efficient and integrable isophosphate source will play an important role in the future photon integration. However, limited by the existing micromachining technology, it is always difficult to finish the experiment. Here, considering the controllable characteristics of the graphene Fermi level, an asymmetric metal nanoantenna structure loaded with graphene is designed, and the unidirectional transmission of (SPPs) with electrically controlled surface isophosphoric elements is realized. Compared with the traditional isolator unidirectional equipment, the device can make up the experimental error by fine-tuning. At the same time, it has the advantages of wide band, single voltage regulation, easy integration and so on. This tunable source will have important application value in the field of photonic integration and optoelectronics in the future. In theory and experiment, how to realize the graphene modulator with high modulation depth and the SPPs graphene detector with high responsivity by using the strong local field characteristic of SPPs is preliminarily tried. According to the characteristic that graphene does not absorb the longitudinal field of SPPs but only absorbs the transverse field, a waveguide array structure is designed to flip the original SPPs field. Compared with the existing modulator of graphene SPPs, the modulation depth is increased by an order of magnitude. Finally, based on the above analysis, a structure of graphene photodetection is proposed and briefly analyzed theoretically.
【學(xué)位授予單位】：廣西師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O613.71;TN15;TN622

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相關(guān)期刊論文 前1條

1 王振林;;表面等離激元研究新進(jìn)展[J];物理學(xué)進(jìn)展;2009年03期

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本文編號：2164589