本文選題：石墨烯　切入點(diǎn)：電磁材料　出處：《東南大學(xué)》2017年博士論文

【摘要】：近來(lái)來(lái),石墨烯作為一種二維碳材料正在吸引著國(guó)內(nèi)外學(xué)者的廣泛關(guān)注和研究熱潮。由于這種新型材料具備特異屬性,其在電子、材料、物理、化學(xué)、生物醫(yī)學(xué)等學(xué)科展現(xiàn)了廣闊的應(yīng)用前景。本文從電磁學(xué)角度出發(fā),研究了石墨烯的可調(diào)控特征,并進(jìn)一步利用此特征探索了基于表面波與空間波類型的電磁功能器件設(shè)計(jì)機(jī)理與典型應(yīng)用案例。本文的主要工作及其創(chuàng)新點(diǎn)概括如下幾點(diǎn):1.系統(tǒng)分析、概括了石墨烯及其結(jié)構(gòu)不同的加工制備方法,總結(jié)了各種方法在應(yīng)用上適合的場(chǎng)景,以及各種方法對(duì)應(yīng)電磁參數(shù)的大致取值范圍,這些工作奠定了石墨烯實(shí)用化的基礎(chǔ)。2.全面分析了石墨烯全頻段電磁特性,基于此探討了不同工作頻率條件下的石墨烯電磁參數(shù)表示方法�？偨Y(jié)了石墨烯不同的調(diào)控手段,并根據(jù)調(diào)控效率指出了當(dāng)前設(shè)計(jì)基于石墨烯的電磁器件最有效的調(diào)控技術(shù)的發(fā)展方向。3.回顧了石墨烯支持的表面波模式,并著重介紹了 TM模式表面波的傳播特性,在此基礎(chǔ)上,進(jìn)一步研究了石墨烯邊緣模式的表面波,分析對(duì)比了兩種邊緣模式,并討論了兩種模式的各自特點(diǎn)。4.基于石墨烯表面波提出了幾種典型的電磁器件,利用石墨烯納米條帶上邊緣模式表面波的干涉特性、耦合特性、諧振特性研究了邏輯門、平面、立體諧振環(huán)。a).通過調(diào)節(jié)石墨烯條帶的長(zhǎng)度,石墨烯偶邊緣模式表面波能夠有效相干相消或者相干增強(qiáng),并且設(shè)計(jì)的邏輯門(異或門、同或門)比傳統(tǒng)的介質(zhì)、金屬結(jié)構(gòu)要更加緊湊;b).通過求解超越方程得到石墨烯圓環(huán)的本征模式,并通過石墨烯直條帶將能量耦合到圓環(huán)上,展示了這種平面諧振環(huán)具有明顯的通、阻帶作用,并且諧振譜可以通過石墨烯的化學(xué)勢(shì)調(diào)控,基于此進(jìn)一步設(shè)計(jì)了一種四狀態(tài)開關(guān);c).在本課題組之前的研究基礎(chǔ)之上,本文進(jìn)一步展示了石墨烯與傳統(tǒng)的金屬材料對(duì)表面波束縛的差異,即便是將石墨烯條帶彎曲成360°其仍然能夠支持傳播表面波,并使用石墨烯直條帶可以將電磁信號(hào)耦合到這種立體環(huán)結(jié)構(gòu)上,實(shí)現(xiàn)了與平面結(jié)構(gòu)類似的頻譜特性。5.回顧并總結(jié)了石墨烯與空間波的相互作用形式,從石墨烯本身與電磁波的作用比較微弱的角度開始闡述,逐步深入地探討了若干種增強(qiáng)相互作用的結(jié)構(gòu)。6.在對(duì)石墨烯與空間波作用機(jī)理理解的基礎(chǔ)之上,分別提出了以下幾種電磁器件應(yīng)用案例:a).石墨烯調(diào)控Fabry-Perot諧振腔可以實(shí)現(xiàn)對(duì)反射波的幅度和相位進(jìn)行有效控制,其中相位在三個(gè)工作頻點(diǎn)附近的變化范圍分別達(dá)到了 310°、260°、215°,根據(jù)這三個(gè)頻點(diǎn)的變化范圍針對(duì)性地設(shè)計(jì)了三種不同的陣列排布方法,實(shí)現(xiàn)了對(duì)反射波束的有效控制;b).研究了一種石墨烯與介質(zhì)棒的復(fù)合非諧振結(jié)構(gòu),這種復(fù)合結(jié)構(gòu)在宏觀上的等效電磁參數(shù)具有可調(diào)控特性,例如,在25THz處,等效折射率可以在1～2范圍內(nèi)變化,數(shù)值仿真結(jié)果證明,這種結(jié)構(gòu)可以作為“數(shù)字超材料”的“比特單元”,并演示了異常透射、龍伯透鏡、電磁“黑洞”案例;c).研究了一種石墨烯互補(bǔ)開口諧振環(huán)結(jié)構(gòu),這種結(jié)構(gòu)具有與對(duì)應(yīng)的正結(jié)構(gòu)類似的頻譜特征,兩者的諧振機(jī)理予以細(xì)致分析對(duì)比,本文提出的互補(bǔ)結(jié)構(gòu)結(jié)合石墨烯的調(diào)控方法,具有一致調(diào)控的優(yōu)勢(shì);d)提出了一種石墨烯雙回結(jié)構(gòu)微波吸波器結(jié)構(gòu),這種結(jié)構(gòu)印制在柔性材料上,并在上下層之間填充電解質(zhì)實(shí)現(xiàn)對(duì)石墨烯的高效調(diào)控,在石墨烯表面阻抗達(dá)到60Ω/sq時(shí)候,可以在5～20GHz寬帶范圍實(shí)現(xiàn)吸收效率90%以上的吸波效果。本文的相關(guān)研究成果己發(fā)表在國(guó)際知名期刊IEEE Photoncs Technology Letters,Plasmonics,Journal of Physics D:Applied Physics、Europhysics Letters,其中第一作者四篇;國(guó)際會(huì)議International Symposiumal on Antennas and Propagation、Progress In Electromagnetics Research Symposium、Asia-Pacific Micro wave Confrence,其中第一作者兩篇。截止目前發(fā)表的文章被引用次數(shù)達(dá)到40(googlescholar)。這些研究成果在一定程度上促進(jìn)了我國(guó)在石墨烯電磁學(xué)領(lǐng)域內(nèi)的研究步伐,對(duì)未來(lái)在此領(lǐng)域內(nèi)的學(xué)術(shù)和應(yīng)用研究提供一些參考。
[Abstract]:Recently, graphene is a two-dimensional carbon material is attracted extensive attention of scholars and researchers. Because of this new material with specific properties, in the electronic, material, physics, chemistry, biomedical science show a broad application prospects. In this paper, from the perspective of electromagnetics, control characteristics of graphite graphene, and further explore the function of using this feature of electromagnetic device design mechanism of surface wave and wave type and typical application based on the case. The main work and innovation are summarized as follows: 1. system analysis, summarized the process of graphene and its structure of different preparation methods, summarizes the various methods for the application of the scene, as well as various methods corresponding to the approximate range of electromagnetic parameters, these work laid the foundation for.2. graphene practical comprehensive analysis of the Shi Moxi band Based on the electromagnetic characteristics, discusses the electromagnetic parameters of graphene conditions under different frequencies of representation. Up regulation means different graphene, and according to the regulation efficiency and pointed out the development direction of control technology based on the design of electromagnetic devices graphene is the most effective.3. review of the surface wave mode of graphene supported, and introduced emphatically the propagation characteristics of TM wave mode, on this basis, further research on the surface of graphene edge model, comparative analysis of two kinds of edge model, and discusses the respective characteristics of two kinds of.4. model is proposed based on graphene surface wave electromagnetic devices of several typical interference characteristics of graphene nanoribbons on edge pattern the coupling characteristics of planar resonant characteristics of logic gates, stereo resonant ring.A). By adjusting the graphene strip length, graphene edge pattern pairs The surface wave can effectively interference or coherent enhancement, and the design of the logic gate (XOR gate, XNOR gate) than the traditional medium, metal structure to be more compact; b). Through the eigenmode equation obtained graphene rings, and the graphene strip will direct energy is coupled into the ring, show the planar ring resonator has obvious, stopband, and resonance spectrum of graphene by chemical potential control, the design of a further four state switch based on C).; based on our previous, this paper further shows the difference with the traditional metal materials of graphene on the surface even the beam bound, the graphene strip bent to 360 degrees it can still support the propagation of surface acoustic wave, and the use of graphene strip can be directly coupled to the electromagnetic signal of this three-dimensional structure, and the realization of the plane structure .5. spectrum like reviews and summarizes the interaction with the spatial form of graphene, graphene itself from the electromagnetic wave and the role of the weak point of view to elaborate, gradually discussed several kind of reinforcing structure.6. interaction based on the understanding of graphene with the spatial mechanism, are presented below several application cases of electromagnetic devices: a). The regulation of graphene Fabry-Perot resonant cavity can effectively control the amplitude and phase of reflection wave, the phase change range in the vicinity of the three working frequency reached 310 degrees, 260 degrees, 215 degrees, according to the range of the three frequency points to the design of three different array methods, to achieve effective control of the reflected beam; b) was studied. A composite non resonant structure of graphene and dielectric rod, the composite structure in the macro Effect of electromagnetic parameters can control characteristics, for example, in 25THz, the equivalent refractive index can be changed in the range of 1~2, numerical simulation results show that this structure can be used as "digital super material" bit unit ", and demonstrates the abnormal transmission, electromagnetic Luneberg lens," black hole "case; C). A graphene complementary split ring resonator structure, this structure has similar structure spectrum corresponding to the resonance mechanism, both to detailed analysis and comparison, control methods of graphene with complementary structure is proposed in this paper, with the regulation of the advantage; d) proposes a graphene double circuit structure of microwave absorber structure, this structure is printed on a flexible material, and in between the upper and lower filling electrolyte to achieve efficient regulation of graphene, achieve 60 ohm /sq when the surface impedance of graphene, in 5 ~ 20GHz wide. The absorption efficiency of more than 90% of the absorbing effect. The results of this study have been published in the International Journal of Plasmonics IEEE Photoncs Technology Letters, Journal of, Physics D:Applied Physics, Europhysics Letters, the first author of article four; International Symposiumal on Antennas and international conference Propagation, Progress In Electromagnetics Research Symposium, Asia-Pacific Micro wave Confrence, which the first author of two articles. The published article cited the number reached 40 (googlescholar). The results of these studies contributed to our country in the graphene electromagnetic field the pace of research to a certain extent, to provide some reference for future research and application in this field.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：O613.71

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