Statistics of Electromagnetic Propagation and Localization

电磁传播和定位统计

• 批准号: 0538350
• 负责人: Azriel Genack
• 金额: --
• 依托单位: CUNY Queens College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-12-01 至 2009-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0538350&HistoricalAwards=false
• 关键词: Statistics; Electromagnetic; Propagation; Localization

********NON-TECHNICAL ABSTRACT********The goal of the research is to obtain a comprehensive understanding of waves in disordered systems. Since all transport, be it electronic or acoustic, optical or microwave, is via the propagation of waves, this study will help unify diverse disciplines. As a result of the overlap of waves following different convoluted paths, waves can be localized and transport inhibited. The impact of wave localization determines the character of matter and energy migration. A statistical understanding of transport will be obtained by pulsed and steady-state microwave measurements of localization within and on the output surfaces of collections of realizations of random samples. Optical measurements in random stacks of material will also be carried out to explore the transformation of propagation from a one to a three dimensional problem as the wave is scattered by nonuniformity in the layer thickness. High school students, undergraduates, graduate students and a postdoctoral fellow involved in this research will learn to think out-of-the-box in their exploration of challenging fundamental problems with far-ranging applications to free-space and cellular communications, electronics, photonics, and medical imaging.******** TECHNICAL ABSTRACT********This project will explore fundamental aspects of electromagnetic propagation in random materials that will lead to a universal description of electronic and acoustic, as well as microwave and optical waves in multiply-scattering media. The affects of localization and absorption which are intertwined in steady-state experiments will be unscrambled in microwave measurements of the time evolution of the wave. The connection between statistics of propagation in single sample realizations and in a random ensemble will allow us to show the manner in which localization in the time domain arises from correlation of transmission with frequency shift. The spatial extent of the wave will also be measured inside a single-mode slotted waveguide containing randomly juxtaposed dielectric slabs. The field distribution will be analyzed as a sum of quasimodes plus an evanescent wave. Related optical measurements will be carried out in random layered media to explore the transformation of propagation from a one to a three dimensional problem as the wave is scattered by transverse inhomogeneity. High school students, undergraduates, graduate students and a postdoctoral fellow will be involved in collaborative fundamental research with applications to communications, electronics, photonics, and medical imaging.

* 非技术摘要 ** 研究的目标是全面了解无序系统中的波。由于所有的传输，无论是电子或声学，光学或微波，都是通过波的传播，这项研究将有助于统一不同的学科。由于遵循不同回旋路径的波的重叠，波可以被局部化并且传输被抑制。波的局部化作用决定了物质和能量迁移的性质。运输的统计理解将获得脉冲和稳态微波测量的本地化内和随机样品的实现集合的输出表面上。还将进行随机堆叠材料中的光学测量，以探索当波被层厚度的不均匀性散射时，从一维问题到三维问题的传播转变。参与这项研究的高中生，本科生，研究生和博士后研究员将学会在探索具有挑战性的基本问题时进行开箱即用的思考，这些问题广泛应用于自由空间和蜂窝通信，电子学，光子学和医学成像。技术摘要 * 本项目将探索随机材料中电磁波传播的基本方面，这将导致对多重散射介质中的电子波、声波以及微波和光波的普遍描述。在稳态实验中相互交织的局域化和吸收的影响将在微波测量波的时间演化中得到解释。在单样本实现和在一个随机的合奏传播统计之间的连接将使我们能够显示的方式，在时域中的本地化产生的传输与频移的相关性。波的空间范围也将在包含随机并列的电介质板的单模开槽波导内测量。场分布将被分析为准模加上倏逝波的总和。相关的光学测量将在随机分层介质中进行，以探索当波被横向不均匀性散射时，从一维问题到三维问题的传播转换。高中生，本科生，研究生和博士后研究员将参与合作基础研究，应用于通信，电子，光子学和医学成像。