超材料性能调控与偏振敏感性应用

发布时间：2018-08-20 14:09

【摘要】：超材料是一种人工合成的复合材料,它具有自然界中材料所不具备的超常物理性质。随着人们对超材料的深入研究,它的概念得到了扩展,研究重点也从超材料的基本特性发展到它的应用上。本文主要研究了金属开口谐振环(SRR)与金属纳米线结构的基本特性和应用。首先,我们研究了金属开口谐振环(SRR)结构在入射电磁波作用下的电磁响应特性。接着,我们研究了影响SRR谐振特性的因素,包括单元结构尺寸、单元之间的相互作用以及周围介质环境三方面。其次,我们基于SRR结构,用外加偏压法实现了超材料谐振特性的调控,反偏电压从0V变化到-8V时,谐振波长偏移约250nm。此外,我们还提出一种新的调控方式,通过改变入射光的偏振方向来改变SRR的谐振波长,不需要外加激励源。这种新的调控方式是作用在对偏振光更加敏感的双开口金属谐振环(SRR)结构上,当偏振角改变60°时,谐振波长偏移约150nm。本文中我们还研究了双开口SRR与金属纳米线两种结构偏振特性的应用。首先,研究表明这种双开口SRR结构只允许特定偏振方向的光透过,而阻挡与之正交方向的偏振分量,因此可以用作偏振选择器。其次,我们针对金属纳米线结构主要研究了两方面的应用,分别为可编码超材料和显示可控超材料。根据金属纳米线两种不同的排布方式可以编码为“0”码和“1”码,再根据透射光强度差异对其进行解码。把这种结构用于显示时,由于不同的排布方式对入射光的透过率不同,因此可以得到相应位置的亮暗显示,并且通过改变入射光的偏振方向可以变换显示状态。
[Abstract]:Metamaterial is a kind of synthetic composite material, which has supernormal physical properties which are not found in nature. With the further study of metamaterials, the concept of metamaterials has been expanded, and the research emphasis has also developed from the basic characteristics of metamaterials to its applications. In this paper, the basic characteristics and applications of metal open resonant ring (SRR) and metal nanowire structure are studied. First, we study the electromagnetic response of metal open resonant ring (SRR) structure under the action of incident electromagnetic wave. Then, we study the factors that affect the resonant characteristics of SRR, including the size of the element structure, the interaction between the elements and the surrounding media environment. Secondly, based on the SRR structure, the resonant characteristics of the supermaterial are regulated by the external bias method. When the reverse bias voltage changes from 0 V to -8 V, the resonant wavelength shifts about 250 nm. In addition, we propose a new way to change the resonant wavelength of the SRR by changing the polarization direction of the incident light without the need of an external excitation source. The new control method is applied to the (SRR) structure of the double open metal resonant ring, which is more sensitive to polarized light. When the polarization angle is changed 60 掳, the resonant wavelength deviates about 150 nm. In this paper, we also study the application of polarization characteristics of double open SRR and metal nanowires. Firstly, it is shown that the dual-open SRR structure can only allow light in a specific polarization direction and block the polarization component in the orthogonal direction, so it can be used as a polarization selector. Secondly, we mainly study the applications of two kinds of metal nanowire structures, namely, the coding supermaterial and the display controllable supermaterial. According to two different arrangement modes of metal nanowires, they can be encoded as "0" code and "1" code, and then decoded according to the intensity difference of transmitted light. When the structure is used for display, the different arrangement modes have different transmittance of incident light, so we can get the light and dark display at the corresponding position, and the display state can be changed by changing the polarization direction of the incident light.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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