本文關(guān)鍵詞： 超材料 石墨烯 電磁誘導(dǎo)透明 群折射率　出處：《上海師范大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：超材料(metamaterials)是人工設(shè)計(jì)的亞波長(zhǎng)結(jié)構(gòu),可以展現(xiàn)許多新奇的光學(xué)現(xiàn)象,比如負(fù)折射率,超分辨,光學(xué)隱身,類電磁誘導(dǎo)透明等。其中,類電磁誘導(dǎo)透明現(xiàn)象是源于一種由量子相干效應(yīng)產(chǎn)生的光學(xué)類比現(xiàn)象。就電磁誘導(dǎo)透明現(xiàn)象而言,因其具有慢光、強(qiáng)非線性等特點(diǎn)和在無粒子數(shù)反轉(zhuǎn)激光器中的應(yīng)用,受到了廣泛的關(guān)注。相比量子的電磁誘導(dǎo)透明現(xiàn)象,由超材料調(diào)制的類電磁誘導(dǎo)透明具有結(jié)構(gòu)可調(diào)的優(yōu)點(diǎn),對(duì)這類現(xiàn)象的的深入研究,不僅可以不斷創(chuàng)新有關(guān)光與材料相互作用的科學(xué)理論;而且還可以發(fā)掘其豐富的潛在應(yīng)用。超材料電磁誘導(dǎo)透明發(fā)展至今,通過改變結(jié)構(gòu)尺寸來調(diào)節(jié)EIT(Electromagnetically Induced Transparency)的透射峰位,調(diào)節(jié)群速度,實(shí)現(xiàn)慢光效應(yīng)的固定式調(diào)節(jié)已經(jīng)被研究的比較透徹。下一步,人們考慮的方向是一種主動(dòng)式的調(diào)節(jié),即根據(jù)需求來主動(dòng)調(diào)節(jié)透射窗口和峰位。本文中,基于石墨烯與超材料的混合結(jié)構(gòu),通過石墨烯與超材料的電感性耦合,實(shí)現(xiàn)超材料EIT透明窗口的動(dòng)態(tài)可調(diào),并實(shí)現(xiàn)對(duì)慢光效應(yīng)的動(dòng)態(tài)調(diào)制。本論文從理論和模擬仿真上來研究基于石墨烯的超材料電磁誘導(dǎo)透明現(xiàn)象的調(diào)控。主要內(nèi)容:一,利用微擾理論研究了石墨烯與金屬結(jié)構(gòu)耦合后對(duì)峰位的影響,研究結(jié)果表明透射峰的移動(dòng)正比于石墨烯電導(dǎo)率的虛部。并通過耦合模理論得到了電磁誘導(dǎo)透明透射公式;二,研究了在不同模式間距下超材料EIT峰位和群速度的變化以及不同費(fèi)米能級(jí)的石墨烯對(duì)EIT透射譜和群速度的影響。結(jié)果表明,在無石墨烯的情況下,間距30 nm,透射窗口的群速度可以降低到2.862%光速。附加不同費(fèi)米能級(jí)的石墨烯后,既可以動(dòng)態(tài)調(diào)制峰位的藍(lán)移或紅移也可以調(diào)控群速度;三,利用不同費(fèi)米能級(jí)的石墨烯調(diào)制EIT現(xiàn)象,實(shí)現(xiàn)峰位,群速度的動(dòng)態(tài)調(diào)控。最后利用推導(dǎo)的公式擬合EIT透射譜,確定結(jié)構(gòu)參數(shù)和石墨烯在超材料電磁誘導(dǎo)透明現(xiàn)象中所扮演的角色,并通過石墨烯對(duì)明暗模式的單獨(dú)調(diào)制,發(fā)現(xiàn)暗模式對(duì)EIT的峰位起主要作用。
[Abstract]:Metamaterials) is an artificially designed subwavelength structure that displays many novel optical phenomena, such as negative refractive index, superresolution, optical stealth, electromagnetically induced transparency, etc. Electromagnetic induced transparency is a kind of optical analogies produced by quantum coherence effect. As far as electromagnetic induced transparency is concerned, it has the characteristics of slow light, strong nonlinearity and its application in non-inversion of population lasers. Compared with the quantum electromagnetically induced transparency, the quasi-electromagnetic induced transparency modulated by metamaterials has the advantage of adjustable structure. Not only can the scientific theory of the interaction between light and material be innovated continuously, but also its rich potential applications can be explored. The transmission peak position of EIT(Electromagnetically Induced transparent can be adjusted by changing the structural dimension of the supermaterial electromagnetically induced transparency. Adjusting group velocity and realizing fixed regulation of slow light effect have been studied thoroughly. The next step is to actively adjust the transmission window and peak position according to the demand, the next step is to adjust the transmission window and peak position according to the demand. Based on the mixed structure of graphene and metamaterial, the dynamic tunable of EIT transparent window is realized by the inductive coupling of graphene and metamaterial. In this thesis, the modulation of electromagnetically induced transparency in graphene based supermaterials is studied theoretically and simulated. The main contents are as follows: 1. The effect of graphene coupled with metal structure on the peak position is studied by using perturbation theory. The results show that the shift of transmission peak is proportional to the imaginary part of the conductivity of graphene. The electromagnetically induced transparent transmission formula is obtained by coupling mode theory. The variation of EIT peak position and group velocity of metamaterials at different mode spacing and the influence of graphene with different Fermi levels on EIT transmission spectra and group velocities are studied. The results show that the EIT transmission spectra and group velocities are affected by graphene without graphene. The group velocity of transmission window can be reduced to 2.862% speed of light when the distance is 30 nm. When graphene with different Fermi energy levels is added, the group velocity can be dynamically modulated either by blue shift or red shift of peak position. The EIT phenomenon is modulated by graphene with different Fermi levels to realize the dynamic regulation of peak position and group velocity. Finally, the EIT transmission spectrum is fitted by the derived formula. The structure parameters and the role of graphene in the electromagnetically induced transparency of metamaterials are determined. It is found that the dark mode plays a major role in the peak position of EIT by the alone modulation of the light and dark modes by graphene.
【學(xué)位授予單位】：上海師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O441;TB34

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本文編號(hào)：1486329