本文關(guān)鍵詞： 超材料 太赫茲 電磁誘導(dǎo)透明 寬頻帶 諧振　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：超材料是一種具有人工結(jié)構(gòu)陣列的材料,與天然材料相比有著獨(dú)特的奇異物理性能。對這一性能加以有效控制,可進(jìn)一步控制電磁波在這種材料中的傳播特性。近年來,利用超材料提升太赫茲器件的性能成為研究人員關(guān)注的熱點(diǎn),涌現(xiàn)出基于超材料的太赫茲濾波器、吸波器、傳感器、偏振片、調(diào)制器等新型器件。其中一個(gè)具有代表性的方面即為基于超材料模擬電磁誘導(dǎo)透明的研究。這種現(xiàn)象所表現(xiàn)出的卓越慢光性能,對于太赫茲開關(guān)、太赫茲調(diào)制器的發(fā)展有很大的促進(jìn)作用。本文對基于超材料的電磁誘導(dǎo)透明結(jié)構(gòu)進(jìn)行設(shè)計(jì),并對其性能參數(shù)進(jìn)行仿真分析。主要研究內(nèi)容為:1.提出一種基于石墨烯片以及開口諧振環(huán)實(shí)現(xiàn)太赫茲波段寬頻帶電磁誘導(dǎo)透明現(xiàn)象的主動(dòng)式超材料結(jié)構(gòu)。利用開口諧振環(huán)所產(chǎn)生的LC諧振作為暗模式,石墨烯材料產(chǎn)生的偶極等離子體諧振充當(dāng)明模式,通過在該平面結(jié)構(gòu)上增加暗模諧振器數(shù)量以增強(qiáng)諧振器間耦合進(jìn)而拓寬頻帶。通過對該結(jié)構(gòu)的透射光譜及電場分布進(jìn)行仿真分析,揭示了通過增強(qiáng)電磁耦合展寬頻帶的特性,驗(yàn)證了基于調(diào)節(jié)明模原子的諧振頻率進(jìn)行主動(dòng)控制電磁誘導(dǎo)透明窗口的可行性。2.運(yùn)用三原子系統(tǒng)理論及寬頻帶理論設(shè)計(jì)了基于超材料的太赫茲雙模寬頻帶電磁誘導(dǎo)透明結(jié)構(gòu),透明窗口帶寬分別為0.30 THz和0.24 THz。利用仿真所得透射光譜以及電場分布分別對明模諧振器、暗模諧振器、準(zhǔn)暗模諧振器進(jìn)行單獨(dú)諧振及組合產(chǎn)生電磁誘導(dǎo)透明現(xiàn)象的作用機(jī)理進(jìn)行分析,結(jié)果表明通過利用明模諧振器與暗模諧振器、明模諧振器與準(zhǔn)暗模諧振器交替耦合所組成的結(jié)構(gòu)可以呈現(xiàn)出雙模電磁誘導(dǎo)透明的特性。進(jìn)一步對影響多層結(jié)構(gòu)的寬頻帶特性、幾何參數(shù)及電介質(zhì)層因素進(jìn)行了分析。
[Abstract]:Metamaterial is a kind of material with artificial structure array, which has unique physical properties compared with natural materials. In recent years, the use of metamaterials to improve the performance of terahertz devices has become the focus of attention of researchers, the emergence of terahertz filters based on metamaterials. Novel devices such as absorbers, sensors, polarizers, modulators and so on. One of the representative aspects is the study of electromagnetic induced transparency based on metamaterials. This phenomenon shows excellent slow light performance. The development of terahertz modulator plays a very important role in the development of terahertz switch. The electromagnetic induced transparent structure based on metamaterials is designed in this paper. The performance parameters are simulated and analyzed. The main research contents are as follows:. 1. An active metamaterial structure based on graphene sheet and open resonant ring is proposed to realize the wide band electromagnetic induced transparency in terahertz band. The LC resonance generated by the open resonant ring is used as dark mode. The dipole plasma resonance produced by graphene materials acts as an open mode. By increasing the number of dark mode resonators in the plane structure to enhance the coupling between resonators and broaden the frequency band, the transmission spectrum and electric field distribution of the structure are simulated and analyzed. The characteristics of broadening the frequency band by enhancing electromagnetic coupling are disclosed. The feasibility of active control of electromagnetic induced transparent window based on adjusting the resonant frequency of open-mode atom is verified. 2. The terahertz dual-mode broadband electricity based on supermaterial is designed by using the theory of Sanyuan subsystem and broadband theory. Magnetically induced transparent structure. The transparent window bandwidth is 0. 30 THz and 0. 24 THZ respectively. The transmission spectrum and electric field distribution obtained by simulation are applied to the open mode resonator and dark mode resonator respectively. The mechanism of the quasi-dark mode resonator and the electromagnetic induced transparency caused by the combination are analyzed. The results show that the open mode resonator and the dark mode resonator are used. The structure composed of alternating coupling of open mode resonator and quasi dark mode resonator can exhibit the characteristics of double mode electromagnetic induced transparency and further influence the broadband characteristics of multilayer structure. Geometric parameters and dielectric layer factors are analyzed.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB34;O441

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本文編號(hào)：1446290