本文選題：太赫茲　切入點(diǎn)：超材料　出處：《電子科技大學(xué)》2016年碩士論文

【摘要】：近年來,超材料的研究覆蓋了眾多領(lǐng)域,從微波波段到可見光波段,從基礎(chǔ)研究到應(yīng)用研究。最近,超材料在非線性、可增益、動(dòng)態(tài)可調(diào)、光轉(zhuǎn)換以及量子等方面取得的新進(jìn)展,使超材料成為研究一些特殊物理現(xiàn)象的一個(gè)豐富多彩的媒介,并為光子學(xué)器件的突破性發(fā)展奠定了基礎(chǔ)。另一方面,4-(4-二甲基氨基苯乙烯基)甲基吡啶對甲基苯磺酸鹽(簡稱DAST)是一種非常重要的有機(jī)材料,具有顯著的雙折射效應(yīng)、橫向光學(xué)聲子、電光效應(yīng)以及二階非線性效應(yīng),在太赫茲發(fā)射、探測領(lǐng)域,以及高速電光調(diào)制、電光采樣、集成光波導(dǎo)等光學(xué)集成器件領(lǐng)域具有廣闊的應(yīng)用前景。本論文中,通過將DAST晶體與超材料結(jié)構(gòu)相結(jié)合,作為超材料的介電層,得到以下結(jié)果:(1)將DAST晶體作為超材料的介電層,利用DAST晶體的雙折射效應(yīng),實(shí)現(xiàn)了響應(yīng)頻率隨入射光偏振方向變化的超材料。仿真結(jié)果表明:本論文設(shè)計(jì)的超材料結(jié)構(gòu),其響應(yīng)頻率可在1.54THz到2.07THz范圍內(nèi)變化,變化范圍達(dá)到29%。(2)利用DAST晶體在1.1THz處的橫向光學(xué)聲子,將DAST的分子振動(dòng)與超材料的結(jié)構(gòu)振動(dòng)集成到一個(gè)系統(tǒng)中。仿真結(jié)果表明:DAST超材料耦合系統(tǒng)屬于光與物質(zhì)的強(qiáng)耦合,系統(tǒng)的真空Rabi分裂頻率為0.37THz,是本征振動(dòng)頻率1.1THz的31%。仿真得到的隨超材料結(jié)構(gòu)尺寸變化的分裂峰,其分布曲線與理論計(jì)算預(yù)測結(jié)果吻合得很好。(3)首次成功地制作出DAST多晶超材料,并進(jìn)行了太赫茲響應(yīng)測試。結(jié)果表明,在響應(yīng)頻率1.04THz處,超材料的吸收率達(dá)50%。此外,在原有的Al/Si襯底基礎(chǔ)上,引入圖形化SiO2層后,DAST薄膜的平整度獲得明顯改善,DAST多晶超材料的響應(yīng)得到增強(qiáng),吸收率達(dá)到60%。(4)在DAST多晶超材料中,發(fā)現(xiàn)了DAST分子振動(dòng)與超材料上下金屬層之間的F-P腔共振耦合,從實(shí)驗(yàn)上觀測到了分子振動(dòng)引入透過現(xiàn)象。(5)首次成功地制作出DAST單晶超材料,并從實(shí)驗(yàn)上觀測到DAST分子振動(dòng)與超材料結(jié)構(gòu)之間的強(qiáng)耦合,以及DAST晶體的各向異性對超材料響應(yīng)的影響。這些研究成果,在一定程度上,發(fā)掘了DAST晶體的應(yīng)用潛力,拓展了超材料的研究范圍;同時(shí),為光與物質(zhì)的耦合相關(guān)基礎(chǔ)物理學(xué)理論的研究,提供了一個(gè)可行的實(shí)驗(yàn)方案及證明。
[Abstract]:In recent years, the research of metamaterials has covered many fields, from microwave band to visible wave band, from basic research to application research. New advances in optical conversion and quantum have made metamaterials a colorful medium for the study of specific physical phenomena. It also lays a foundation for the breakthrough development of photonics devices. On the other hand, 4-dimethylaminophenylvinyl) pyridine p-methylbenzene sulfonate (DAST) is a very important organic material with remarkable birefringence effect. Transverse optical phonons, electro-optic effects and second-order nonlinear effects have broad application prospects in the field of terahertz emission, detection, high-speed electro-optic modulation, electro-optic sampling, integrated optical waveguide and other optical integrated devices. By combining DAST crystal with metamaterial structure as the dielectric layer of supermaterial, the following results are obtained: 1) the DAST crystal is used as the dielectric layer of metamaterial, and the birefringence effect of DAST crystal is utilized. The supermaterial whose response frequency varies with the polarization direction of incident light is realized. The simulation results show that the response frequency of the metamaterial structure designed in this paper can vary from 1.54THz to 2.07THz. Using the transverse optical phonon of DAST crystal at 1.1THz, the molecular vibration of DAST and the structural vibration of metamaterials are integrated into a system. The simulation results show that the coupling system of DAST supermaterial belongs to the strong coupling of light and matter. The vacuum Rabi splitting frequency of the system is 0.37 THZ, which is the 31th peak of the intrinsic vibration frequency 1.1THz. The distribution curve of DAST polycrystalline supermaterial obtained by simulation is in good agreement with the predicted results of theoretical calculation. The terahertz response test was carried out. The results show that the absorptivity of the supermaterial reaches 50% at the response frequency 1.04THz. In addition, on the basis of the original Al/Si substrate, The flatness of Dast film was improved by introducing graphical SiO2 layer. The response of Dast polycrystalline supermaterial was enhanced, and the absorptivity reached 60%. In DAST polycrystalline supermaterial, the resonance coupling between DAST molecular vibration and the upper and lower metal layers of the supermaterial was found. In this paper, we have observed experimentally the phenomenon of molecular vibration introducing transmission. (5) the DAST single crystal supermaterial has been successfully prepared for the first time, and the strong coupling between the molecular vibration of DAST and the structure of the supermaterial has been observed experimentally. And the effect of anisotropy of DAST crystal on the response of metamaterials. To some extent, these results have explored the application potential of DAST crystals and expanded the research scope of metamaterials. It provides a feasible experimental scheme and proof for the fundamental physics theory of the coupling of light and matter.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TB34

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本文編號：1665075