基于磁性特异电磁介质的热控折射率特性和非互易古斯—汉欣位移

发布时间：2018-05-08 18:18

本文选题：磁性特异电磁介质 + 多重散射理论　；参考：《浙江师范大学》2015年硕士论文

【摘要】：特异电磁介质是一种人造的亚波长单元阵列成的材料。传统材料的电磁特性源自原子和分子,而特异电磁介质给予我们设计亚波长尺度的“原子”。因此特异电磁介质能够实现自然界很难实现的性质,如：电磁波隐身、负折射材料、零折射材料、突破衍射极限的超分辨率和其他非互易现象等等。特异电磁介质不仅局限于特殊电磁特性,为了增加其在设计和应用中的灵活性与自由性,可调控特异电磁介质也被提出。正因为奇异电磁性质和可调控特性,特异电磁介质在微波、太赫兹波、红外线和可见光波都有广泛的研究。本文在微波频段研究了温度调控磁性特异电磁介质、零折射特性以及零折射附近存在的古斯-汉欣位移等三个特性。本文包括四章,第一章是绪论,介绍了研究背景和理论。其余三章内容如下：第二章,磁性特异电磁介质已经在理论和实验上实现了使用外加磁场调控。考虑到温度对铁氧体的影响,我们在理论上设计了使用温度对磁性特异电磁介质调控。使用温度调控代替外加磁场,这增加了调控的自由度；第三章,等效介电常数和磁导率同时等于零的匹配型零折射特异电磁介质具有无相位延迟传输和调制波前的作用。通过模拟高斯光束垂直入射至不同厚度的零折射平板,我们观察到了零折射特异电磁介质的无相位延迟传输。随后通过设计不同结构的出射面,实现了对输出波前的调控,包括出射波前为柱面、分束和任意曲面；第四章,零折射率附近存在光波无法耦合进入磁性特异电磁介质的工作频率,该频率下入射高斯光可能会发生全反射。经过优化我们发现在某些合适的频率下存在1至2个波长的古斯-汉欣位移。这种效应在垂直入射时同样出现,而传统光学中垂直入射因光路可逆不可能出现古斯-汉欣位移,展示了旋磁体系存在的非互易性。
[Abstract]:Specific electromagnetic media is an artificial subwavelength unit array. The electromagnetic properties of traditional materials are derived from atoms and molecules, and the specific electromagnetic media give us the "atom" of the subwavelength scale. Therefore, the specific electromagnetic media can achieve the nature of nature very difficult to achieve, such as electromagnetic wave stealth, negative refracting material, zero. Refracting materials, super-resolution and other non reciprocal phenomena that break through the diffraction limit, etc.. Specific electromagnetic media are not only limited to special electromagnetic properties. In order to increase their flexibility and freedom in design and application, specific electromagnetic media can also be regulated. The specific electromagnetic medium is due to the singular electromagnetically and controllable properties. Microwave, terahertz, infrared and visible light waves are widely studied. In this paper, we study three characteristics of temperature regulated magnetic specific electromagnetic media, zero refraction characteristics and Guth Han Xin displacement near zero refraction in the microwave frequency band. This paper includes four chapters. The first chapter is the thread, the research background and theory are introduced. The other three chapters are introduced. In the second chapter, the magnetic specific electromagnetic medium has been implemented in theory and experiment with applied magnetic field control. Considering the effect of temperature on ferrite, we have theoretically designed the use of temperature to regulate magnetic specific electromagnetic media. The use of temperature control instead of the external magnetic field increases the degree of freedom of control; the third chapter, The equivalent dielectric constant and permeability equal to zero are equal to zero and the zero refraction specific electromagnetic medium has the effect of no phase delay transmission and modulation wave. By simulating the vertical incident of Gauss beam to the zero refraction plate of different thickness, we observed the non phase delay transmission of the zero refraction specific electromagnetic medium. The output wavefront of the same structure is regulated by the output wave front, which includes the ejection wave front as the cylinder, the beam splitter and the arbitrary surface. In the fourth chapter, the frequency of the light wave can not be coupled into the magnetic specific electromagnetic medium near the zero refraction rate, and the incident Gauss light may produce full reflection at this frequency. There are 1 to 2 wavelengths at the frequency of the Guth Han Xin displacement. This effect appears equally at the vertical incidence, while the vertical incidence of the traditional optics is not possible because of the reversibility of the optical path, which shows the non reciprocity of the magnetic flux system.

【学位授予单位】：浙江师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB39

【相似文献】