發(fā)布時(shí)間：2018-04-03 12:09

  本文選題：表面等離子體激元　切入點(diǎn)：人工表面等離子體激元　出處：《南京大學(xué)》2015年博士論文

【摘要】：表面等離子體激元(Surface Plasmon Polaritons,SPPs)是一種沿金屬/介質(zhì)分界面?zhèn)鞑サ谋砻骐姶挪�。由于它具有�?qiáng)的電磁場(chǎng)束縛能力,可以有效減小光電子器件及電路的尺寸,從而吸引研究人員的廣泛關(guān)注。在微波或者太赫茲波段,金屬通常近似為理想導(dǎo)體,在光滑金屬表面不能激發(fā)出表面等離子體激元。最近,J.B.Pendry等提出一種人工等離子體材料,該材料可以在低頻段支持類(lèi)似表面等離子體激元的電磁波傳播,被稱(chēng)為人工表面等離子體激元(spoof SPPs)。目前大多數(shù)人工等離子體材料屬于三維金屬/介質(zhì)結(jié)構(gòu),制作難度大,也不容易與現(xiàn)有的平面微波、太赫茲波電路集成。為了克服這些缺點(diǎn),崔鐵軍教授等人提出了一種超薄人工等離子體材料來(lái)支持人工表面等離子體激元,由于該結(jié)構(gòu)具有超薄、工藝簡(jiǎn)單、可彎曲、可共形于任意表面等特點(diǎn),因此,在開(kāi)發(fā)各種各樣的低頻表面波集成電路或器件上具有重要的應(yīng)用前景。鑒于上述發(fā)展趨勢(shì),本文著重開(kāi)展超薄人工表面等離子體激元結(jié)構(gòu)及其應(yīng)用研究。在詳細(xì)分析了超薄人工表面等離子體激元結(jié)構(gòu)的各類(lèi)傳播模式基礎(chǔ)上,根據(jù)人工表面等離子體激元的特點(diǎn),設(shè)計(jì)了一系列人工表面等離子體激元原型器件,例如分波器、耦合器、濾波器、諧振器等,并且首次設(shè)計(jì)并實(shí)現(xiàn)了支持反向波傳輸?shù)娜斯け砻娴入x子體激元結(jié)構(gòu)。本文主要內(nèi)容和研究成果概括如下:(1)理論分析了非對(duì)稱(chēng)超薄人工表面等離子體激元結(jié)構(gòu)的基本模式和高階模式的色散性質(zhì)和傳輸特性,提出了高次模式出現(xiàn)的條件并進(jìn)行了實(shí)驗(yàn)驗(yàn)證。在此基礎(chǔ)上仿真分析和實(shí)測(cè)了高階人工表面等離子體激元模式在彎曲結(jié)構(gòu)上的傳輸性能,具有彎曲損耗相對(duì)較小的特點(diǎn),這為利用該結(jié)構(gòu)的高階模式設(shè)計(jì)原型器件提供了重要的參考依據(jù)。(2)理論分析了對(duì)稱(chēng)超薄人工表面等離子體激元結(jié)構(gòu)所支持的基本模式,包括奇、偶兩種不同模式。提出了一種激勵(lì)奇模式的方法,通過(guò)仿真分析和實(shí)驗(yàn)測(cè)量對(duì)應(yīng)的傳輸譜,驗(yàn)證了該方法的有效性。此外本文還提出了一種新的對(duì)稱(chēng)結(jié)構(gòu),在特定頻段對(duì)人工表面等離子體激元具有更強(qiáng)的束縛性和更低的傳輸損耗,為實(shí)現(xiàn)器件或電路的小型化提供了可能。(3)開(kāi)展了基于超薄人工表面等離子體激元結(jié)構(gòu)原型器件的研究。首先,根據(jù)耦合模式理論,提出了一種利用對(duì)稱(chēng)超薄人工表面等離子體激元結(jié)構(gòu)的偶模式設(shè)計(jì)太赫茲波分波器和耦合器的方法。利用縮放性,設(shè)計(jì)了對(duì)應(yīng)的工作在微波波段的分波器和耦合器,并通過(guò)微波實(shí)驗(yàn)測(cè)量驗(yàn)證了該器件的性能;其次,根據(jù)人工表面等離子體激元的單模傳輸特性,通過(guò)在低頻端增加了一個(gè)傳輸零點(diǎn),實(shí)現(xiàn)了同時(shí)具有寬通帶和寬阻帶特性的帶通濾波器。該濾波器可以有效克服超寬帶微帶線(xiàn)濾波器難以實(shí)現(xiàn)寬阻帶特性的缺點(diǎn);第三,提出了一種具有接地板的非對(duì)稱(chēng)超薄人工表面等離子體激元結(jié)構(gòu),該結(jié)構(gòu)所支持模式的輻射損耗大為減小。利用該結(jié)構(gòu)的第一階高階模式實(shí)現(xiàn)了帶寬和中心頻率都可靈活調(diào)節(jié)的帶通濾波器;最后,利用對(duì)稱(chēng)超薄人工表面等離子體激元結(jié)構(gòu)設(shè)計(jì)了直線(xiàn)型諧振器,通過(guò)對(duì)其Q值分析提出了提高Q值的辦法。此外通過(guò)測(cè)量諧振器的Q值,提出了間接測(cè)量人工表面等離子體激元結(jié)構(gòu)色散曲線(xiàn)和對(duì)應(yīng)的衰減系數(shù)的方法。(4)提出了一種新型對(duì)稱(chēng)超薄人工表面等離子體激元結(jié)構(gòu),可支持具有反向波特性的人工表面等離子體激元傳播。利用其反向波特性,設(shè)計(jì)了一個(gè)微波反向耦合器,并通過(guò)實(shí)驗(yàn)進(jìn)行了驗(yàn)證。這將有助于設(shè)計(jì)新穎人工表面等離子體激元器件或電路結(jié)構(gòu)。
[Abstract]:The surface plasmon (Surface Plasmon, Polaritons, SPPs) is a kind of metal / dielectric interface along the propagation of surface electromagnetic wave. Because it has a strong binding capacity can effectively reduce the electromagnetic field, optoelectronic devices and circuit size, so as to attract the attention of researchers. In the microwave or terahertz band, metals are usually approximated as a perfect conductor and in smooth metal surface can not excite surface plasmon. Recently, J.B.Pendry proposed a kind of artificial plasma material, the material can support similar surface plasmon propagation of electromagnetic wave element at low frequencies, known as artificial surface plasmon (spoof SPPs). The 3D metal / dielectric structure most of artificial plasma materials is difficult to produce, is not easy with the existing planar microwave, terahertz wave integrated circuit. In order to overcome these shortcomings, Cui Tie Professor Jun et al proposed a thin artificial plasma material to support artificial surface plasmon, because the structure has the advantages of simple technology, ultra-thin, flexible, conformal to arbitrary surface characteristics, therefore, it has important application prospect in the development of a variety of surface acoustic wave integrated circuit or device. In view of the development trend in this dissertation, ultrathin artificial surface plasmon structure and its application. Based on a detailed analysis of all kinds of artificial propagation modes of ultra-thin surface plasmon structure, according to the artificial table characteristics of surface plasmon, designed a series of artificial surface plasmon prototype devices, such as filters, couplers, filters. The first resonator, and the design and implementation of artificial surface plasmon wave structure to support reverse transmission. The main contents and research The results are summarized as follows: (1) the theoretical analysis of the dispersion properties and transmission characteristics of the basic pattern of asymmetric thin artificial surface plasmon structure and high order mode, put forward the condition of the high order mode and verified. Based on the simulation analysis and the measured transmission performance of the high order artificial surface plasmon excitation in the structure of the bending mode, has the characteristics of bending loss is relatively small, which provides an important reference for the design of the prototype of high order mode device structure. (2) the basic pattern, symmetrical ultrathin artificial surface plasmon structure supported by theoretical analysis including odd, even two different modes put forward a way to motivate the odd mode, transmission through simulation analysis and experimental measurement of the corresponding spectrum, verify the effectiveness of the method. This paper also puts forward a new structure of said, The transmission loss in specific bands is more artificial surface plasmon and the lower bound, provides the possibility for the miniaturization of the device or circuit. (3) studied ultra-thin artificial surface plasmon devices based on the prototype structure. First of all, based on coupled mode theory, puts forward a method of terahertz I design model using symmetric thin artificial surface plasmon wave structure and WDM coupler. Using the zoom, design the corresponding work in WDM coupler and microwave band, and the performance of the device was verified by experiments in microwave measurement; secondly, according to the artificial surface plasmon single-mode element in the end, by adding a low frequency transmission zeros, and has achieved wide passband bandpass filter with wide stopband. The filter can effectively overcome the ultra wideband micro Strip line filter cannot achieve wide stopband shortcomings; third, a non symmetric thin artificial surface plasmon ground structure, radiation loss mode supported by this structure is greatly reduced. The band-pass filter to achieve bandwidth and center frequency can be flexibly adjusted by first order higher order mode the structure; finally, using the symmetric thin artificial surface plasmon structure linear resonator is designed, based on the analysis of Q value is proposed to improve the Q value of the solution. In addition by measuring the Q value of the resonator is proposed, the attenuation coefficient of indirect measurement of artificial surface plasmon dispersion curves and the corresponding structure. (4) proposed a new symmetric thin artificial surface plasmon structure, which can support the artificial surface plasmon propagation with reverse wave characteristics. Using the reverse wave characteristics, A microwave reverse coupler is designed and verified by experiments. This will help to design a novel artificial surface plasmon device or circuit structure.

【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN713;TN62

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