發(fā)布時間：2018-02-03 13:35

  本文關(guān)鍵詞： 太赫茲 超材料 電磁誘導(dǎo)透明 電磁誘導(dǎo)吸收 超表面 表面波 傳感　出處：《天津大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：太赫茲技術(shù)是世界范圍內(nèi)備受矚目的研究方向,在很多前沿領(lǐng)域都有著潛在的應(yīng)用前景。開發(fā)太赫茲功能器件將在很大程度上促進太赫茲技術(shù)的實用化進程。然而,目前基于傳統(tǒng)方法的太赫茲功能器件還很稀少或昂貴。超材料作為一種性質(zhì)可控的電磁材料,為設(shè)計太赫茲功能器件提供了一種有效的方法。本論文詳細研究了多種基于超材料的太赫茲功能器件,具體內(nèi)容如下:1.用超材料類比地實現(xiàn)電磁誘導(dǎo)透明這一量子現(xiàn)象吸引了研究人員的興趣。然而,目前的電磁誘導(dǎo)透明超材料都強烈地依賴入射光的偏振。這里,本論文提出了一種超材料,它由具有4次旋轉(zhuǎn)對稱性的微結(jié)構(gòu)組成。實驗和模擬結(jié)果顯示它可以實現(xiàn)偏振無關(guān)的電磁誘導(dǎo)透明現(xiàn)象。利用耦合模理論,很好地對該結(jié)構(gòu)的工作機制進行了解釋。該偏振無關(guān)特性將使得它更加適用于實際應(yīng)用。2.目前,用超材料類比地實現(xiàn)電磁誘導(dǎo)吸收這一量子現(xiàn)象的工作還很少,現(xiàn)有的此方面工作對于電磁波的吸收程度還很小。這里,本論文提出了一種由三種微結(jié)構(gòu)振蕩器組成的電磁誘導(dǎo)吸收超材料,可以強烈地吸收太赫茲波。實驗、模擬和理論結(jié)果吻合得很好。該設(shè)計將在吸收性光開關(guān)方面有重要的應(yīng)用價值。3.用超表面控制電磁波的相位突變已成為了一個熱點話題,這種用微結(jié)構(gòu)來局域地控制電磁場出射相位的方法幾乎可以生成任意的波前形狀。這里,本論文提出了一種C形振蕩器來控制太赫茲波的相位和波前,設(shè)計并在實驗上證明了一個寬帶的太赫茲平面型偏折分光器和一個奇異菲涅爾波帶片,結(jié)果與理論預(yù)測非常吻合。該設(shè)計在實現(xiàn)太赫茲空間波調(diào)制器方面有重要的應(yīng)用前景。4.當前,大多數(shù)用于相位控制的超表面器件都基于金屬,其電磁波操控效率較低且面臨歐姆損耗問題。這里,本論文提出了一種基于硅的介質(zhì)超材料,用于高效地控制太赫茲波的相位。在此基礎(chǔ)上,又引入了振幅控制機制,設(shè)計了三種奇異光柵,其實驗結(jié)果和理論與模擬結(jié)果吻合得很好。該設(shè)計將在高效率太赫茲空間波調(diào)制器件方面有重要的應(yīng)用前景。5.表面波是一種傳播在金屬和介質(zhì)界面處的電磁波,在下一代芯片光路器件方面有著重要的應(yīng)用前景。這里,本論文將自由空間中的超表面相位控制的概念引入到了表面波激發(fā)中,利用金屬孔結(jié)構(gòu)實現(xiàn)了偏振控制的異常表面波激發(fā)和聚焦、發(fā)散形的表面波波振面,且該結(jié)構(gòu)還可用于傳感入射波的偏振態(tài)以及外界的折射率變化。該設(shè)計將在實現(xiàn)太赫茲電路方面有潛在的應(yīng)用價值。
[Abstract]:Terahertz technology is one of the most attractive research directions in the world. The development of terahertz functional devices will greatly promote the practical process of terahertz technology. At present, terahertz functional devices based on traditional methods are rare or expensive. Metamaterials are considered as a controllable electromagnetic material. It provides an effective method for the design of terahertz functional devices. In this paper, a variety of terahertz functional devices based on metamaterials are studied in detail. The quantum phenomenon of electromagnetically induced transparency by analogy with metamaterials has attracted the interest of researchers. At present, the electromagnetically induced transparent metamaterials are strongly dependent on the polarization of incident light. In this paper, we propose a kind of metamaterials. The experimental and simulation results show that the polarization-independent electromagnetically induced transparency can be realized by the coupled mode theory. The work mechanism of the structure is well explained. The polarization independence will make it more suitable for practical application. 2. At present. The quantum phenomenon of electromagnetic induced absorption by analogy of metamaterials is still rare, but the extent of absorption of electromagnetic wave is still very small. In this paper, an electromagnetic induced absorption supermaterial consisting of three kinds of microstructured oscillators is proposed, which can strongly absorb terahertz waves. The simulation results are in good agreement with the theoretical results. This design will have an important application value in absorbing optical switch. The phase change of electromagnetic wave controlled by supersurface has become a hot topic. This method can produce almost arbitrary wavefront shape by using microstructures to control the phase of electromagnetic field. Here, a C-shaped oscillator is proposed to control the phase and wavefront of terahertz wave. A wideband terahertz planar deflector and a singular Fresnel band plate are designed and experimentally proved. The results are in good agreement with the theoretical prediction. This design has an important application prospect in the realization of terahertz spatial wave modulator. At present, most of the supersurface devices used for phase control are based on metal. The electromagnetic wave control efficiency is low and it faces ohmic loss problem. In this paper, a silicon based dielectric supermaterial is proposed to efficiently control the phase of terahertz wave. The amplitude control mechanism is introduced and three kinds of singular gratings are designed. The experimental results are in good agreement with the simulation results. This design will have an important application prospect in high efficiency terahertz space wave modulator .5.The surface wave is a kind of electromagnetic wave propagating at the interface between metal and medium. Bo. In this paper, the concept of supersurface phase control in free space is introduced to the surface wave excitation. The polarization controlled abnormal surface wave excitation and focus and the divergent surface wave vibration surface are realized by using metal pore structure. The structure can also be used for sensing the polarization state of incident wave and the change of refractive index of the outside world. This design will have potential application value in the realization of terahertz circuit.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：O441.4

【參考文獻】

相關(guān)期刊論文 前1條

1 劉盛綱;;太赫茲科學(xué)技術(shù)的新發(fā)展[J];中國基礎(chǔ)科學(xué);2006年01期

相關(guān)博士學(xué)位論文 前1條

1 谷建強;太赫茲奇異介質(zhì)研究[D];天津大學(xué);2010年

，

本文編號：1487515