RIA: Effective Media Characterization and Optimization of Optically-Active Composite Materials: Applications from Microwave to Optical Frequencies

RIA：光学活性复合材料的有效介质表征和优化：从微波到光学频率的应用

• 批准号: 9210551
• 负责人: Keith Whites
• 金额: $ 10.75万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 1996-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9210551&HistoricalAwards=false
• 关键词: RIA; Effective; Media; Characterization; Optimization

Recently, industrial and academic researchers have developed a keen interest in complex composite materials since they can exhibit unusual and, when properly designed, beneficial electromagnetic properties. An example of this is a chiral, or optically active, material which macroscopically is a large collection of tiny, handed inclusions randomly embedded in a host medium. The objective of this research project is the development of a deterministic capability for macroscopically characterizing both naturally-occurring and artificially-created chiral materials. This capability is crucial in the design of these materials to optimize their beneficial electromagnetic characteristics. This Research Initiative Award project will address this issue through a comprehensive program of research which will combine computational methods with analytical models and techniques to ascertain the effective constitutive parameters. The time-consuming and computationally intensive numerical simulations will be assisted by the use of both equivalent boundary condition models and the implementation of parallel computational algorithms in order to produce results which are both meaningful and temporally tractable. Once the effective descriptors are known they will be applied to a wide range of problems such as optical fibers, devices and waveguides in the optical frequency bands and absorbers and micropatch antenna substrates at microwave frequencies. Finally, experimental measurements will be performed to both validate these methods and results, and to evaluate the accuracy of the macroscopic models.

最近，工业和学术研究人员对复杂的复合材料产生了浓厚的兴趣，因为它们可以表现出不同寻常的，并且当设计得当时，有益的电磁特性。这方面的一个例子是一种手性或光学活性的材料，从宏观上看，它是随机嵌入宿主介质中的大量微小的手状内含物。本研究项目的目标是发展一种确定性能力，用于宏观表征自然发生和人工创造的手性材料。这种能力在这些材料的设计中至关重要，以优化其有益的电磁特性。该研究倡议奖项目将通过一项综合研究计划来解决这一问题，该计划将结合计算方法与分析模型和技术来确定有效本构参数。等效边界条件模型的使用和并行计算算法的实现将有助于耗时且计算量大的数值模拟产生既有意义又暂时可处理的结果。一旦有效描述符被知道，它们将被应用于广泛的问题，如光纤，光学频带的器件和波导以及微波频率的吸收器和微贴片天线基板。最后，将进行实验测量来验证这些方法和结果，并评估宏观模型的准确性。