基于人工电磁结构材料的偏振调控原理及技术研究

发布时间：2018-06-02 06:56

本文选题：人工电磁结构材料 + 偏振调控　；参考：《重庆大学》2016年博士论文

【摘要】：偏振调控技术是电磁学领域的重要研究内容之一,在偏振成像、防伪技术、目标识别、信息通信以及生物医学等领域具有广泛的应用前景。随着微机电系统的发展,人们对电磁波调制元件和系统的微型化,集成化和轻量化提出了更高的要求。开展新型人工电磁结构材料的偏振调控原理及技术研究,对促进偏振调控元件和系统的小型化和集成化,推进电磁学领域的发展具有重要的科学和现实意义。论文在国家973计划和国家自然科学基金等项目的资助下,对基于人工电磁结构材料的偏振调控原理及技术进行了较为深入的研究。论文首先对新型偏振调控人工电磁结构材料的偏振调控物理机制、原理进行了较为深入的分析研究;其次开展了结构设计研究,将单层透射式偏振转换材料的转换效率提高至理论极限,结合广义斯涅尔定律和相位调控达到消除共偏振背景干扰的目的;针对电子束光刻、聚焦离子束刻蚀、双光子光刻等光波段人工电磁结构材料加工技术存在的加工效率低、加工面积小、成本高等问题,开展光波段偏振调控人工电磁结构材料的加工工艺研究,实现了大面型光波段偏振转换器的制备;论文的另一项重要工作是,开展了轴对称偏振人工电磁结构材料的相关研究,提出金属-介质-金属多层光栅结构,实现了电磁波偏振态、相位和振幅的全方位调制,在此基础上设计高效率轴对称偏振人工电磁结构材料,实现了圆偏振到径向偏振和角向偏振的转换,提高了人工电磁结构材料对电磁波的调控自由度,为新型偏振调控及其他光学元件的研制提供了有效的技术手段。论文的主要研究工作和创新点如下:(1)首先在深入分析人工电磁结构材料单元结构形式及其排布方式对结构电磁响应影响的基础上,开展基于人工电磁结构材料的偏振调控基本原理研究,确定结构设计方案;(2)进行人工电磁结构材料的理论分析方法和仿真计算方法研究,通过仿真研究,分析人工电磁结构材料各结构参数与结构偏振转换效果的关系,开展高转换效率、宽工作波段偏振转换器件的设计;(3)针对当前光波段人工电磁结构材料加工技术效率低、面积小、成本高等问题,采用椭圆等离子体谐振器实现高效率光波段偏振转换器的设计,降低加工难度,基于二次曝光双光束激光干涉技术实现大面型偏振调控器件的制备;(4)针对透射式偏振转换人工电磁结构材料低转换效率和高背景干扰的问题,提出半连续结构将单层材料的偏振转换效率提高至理论极限,结合广义斯涅尔定律和相位调控提出悬链线结构在提高转换效率的同时消除共偏振背景干扰;(5)开展轴对称偏振人工电磁结构材料的相关研究,分析将圆偏振转换为径向偏振和角向偏振的基本原理和方法,进行新型轴对称偏振人工电磁结构材料的设计,提高转换效率和径向偏振/角向偏振的纯度;(6)采用椭偏仪和矢量网络分析仪分别对加工反射式和透射式方向性偏振转换器样品进行测试。其中,反射式偏振转换样品在850nm至1930nm波段转换效率大于87.5%,透射式方向性偏振转换样品对应12GHz、15GHz和18GHz的辐射角分别为52.83°,40.62°和32.69°。测试结果与理论和仿真计算相符。
[Abstract]:Polarization control technology is one of the important research contents in the field of electromagnetics. It has wide application prospects in the fields of polarization imaging, anti-counterfeit technology, target recognition, information communication and biomedicine. With the development of microelectromechanical systems, people have put forward higher requirements for the miniaturization, integration and lightweight of electromagnetic wave modulation components and systems. It is of great scientific and practical significance to promote the miniaturization and integration of polarization control elements and systems and promote the development of electromagnetism. Under the support of the national 973 program and National Natural Science Foundation, the paper is based on artificial electromagnetic. The principle and technology of polarization control of structural materials are deeply studied. Firstly, the principle of polarization regulation and control of the new polarization control of artificial electromagnetic structure material is studied. Secondly, the structure design is carried out to improve the efficiency of the conversion efficiency of the single-layer transmissive polarization conversion material. On the limit, combined with the generalized Snell's law and the phase regulation to eliminate the interference of the co polarization background interference, the processing efficiency of the electronic beam lithography, the focused ion beam etching, the two-photon photolithography and other optical waveband artificial electromagnetic materials processing technology is low, the processing area is small, and the cost is high, and the light band polarization control artificial electricity is carried out. The research on the processing technology of magnetic structure material has realized the preparation of the polarization converter of the large face light band. Another important work of this paper is to carry out the research on the axisymmetric polarized artificial electromagnetic structure material, and put forward the structure of the metal dielectric metal multilayer grating, which realizes the omnidirectional modulation of the polarization state, phase and amplitude of the electromagnetic wave. On this basis, the high efficiency axisymmetric polarization artificial electromagnetic structure material is designed. The conversion of circular polarization to radial polarization and angular polarization is realized. The control freedom of electromagnetic wave is improved by the artificial electromagnetic structure material. It provides an effective technical means for the development of new polarization control and other optical elements. And the innovation points are as follows: (1) first, based on the deep analysis of the influence of the structural form of the artificial electromagnetic structure material and its arrangement mode on the electromagnetic response of the structure, the basic principle of polarization control based on the artificial electromagnetic structure material is studied and the design scheme is determined. (2) the theoretical analysis method and imitation of the artificial electromagnetic structure materials are carried out. In the study of real computing method, the relationship between the structural parameters of artificial electromagnetic materials and the effect of polarization conversion is analyzed, and the design of high conversion efficiency and wide working band polarization conversion device is carried out. (3) aiming at the low efficiency, small area and high cost of the present artificial electromagnetic structure material, the ellipse is adopted. The plasma resonator realizes the design of high efficiency optical waveband polarization converter and reduces the difficulty of processing. Based on the two exposure double beam laser interference technique, the preparation of large face polarization control devices is realized. (4) the semi continuous structure will be proposed for the problem of low conversion efficiency and high background interference of transmission polarization conversion artificial electromagnetic structure materials. The polarization conversion efficiency of the single layer material is improved to the theoretical limit. In combination with the generalized Snell's law and the phase regulation, the catenary structure is proposed to eliminate the co polarization interference while improving the conversion efficiency. (5) the study of the axisymmetric polarization artificial electromagnetic structure materials is carried out to analyze the conversion of circular polarization to radial polarization and angular polarization. The basic principles and methods are designed for the design of a new axisymmetric polarized artificial electromagnetic structure material, which improves the conversion efficiency and the purity of the radial polarization / angular polarization. (6) the ellipsometry and vector network analyzer are used to test the reflective and transmission directional polarization converter samples respectively. The reflective polarization conversion sample is 85. The conversion efficiency of the 0nm to 1930nm band is greater than 87.5%. The transmission directional polarization conversion samples correspond to the 12GHz, 15GHz and 18GHz radiation angles of 52.83, 40.62 and 32.69 degrees respectively. The test results are in agreement with the theoretical and simulation calculations.
【学位授予单位】：重庆大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：O441

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