Metamaterial（人工电磁超材料）是近年来电磁科学领域的热点研究话题。Metamaterial可具有超常的电磁特性，在红外及可见光频段具有广阔的应用前景。在本项目中，我们将通过研究metamaterial结构单元的微观模型，建立与完善光频段纳米结构metamaterial的有效介质理论；通过等效电路模型分析metamaterial电磁响应，并提出结构小型化的有效方案；运用metamaterial来设计具有超宽频带的光频段吸波结构和一些光学功能平面结构；利用metamaterial设计新颖的光学传导线和光学天线等。本项目的研究工作，可丰富metamaterial的内容，弥补现有有效介质理论的不足，为各类metamaterial纳米结构、光学器件的设计与制作提供依据，具有重要的科学研究意义。

As a hot topic in the electromagnetic(EM) community in recent years, the called metamaterial has attracted lots of people's attension. Due to their extraordinary EM properties,metamaterials are potentially applied to various fields in the infrared and optical range. However, those nano-sized optical metamaterials, are commonly low qualified, leading to a big sized unit cell and strong absorption to EM waves. In this proporal, we suggest the study on the physical mechanism and the novel applications, of the nano-structured metamaterials, based on the microscopic modeling and a new potential scheme. Firstly, we will investigate the microscopic electrodynamics inside a single metamaterial unit cell, to find out the phsics behind the metamaterials, as well as the corressponding closed form expressions for effective permittivity/permeability, in establishing and improving the effective theory. Second, we will survey the metamaterial's equal-potential phenomenon and its EM responses by means of Thevenin equivalents, and find out the way to reduce the dimension of metamaterial unit cells. Third, we will study the potential applications of metamaterials' equal-potential phenomenon and anomalous dispersion in the optical range, e.g. ultrwide-band absorptive nano-structured metamaterial planar structure and some other functional films inspired by nano-sized metamaterials. We will also conduct the application work on the design of optical planar antennas, and the realizatoin of a novel optical conducting cable, with implementation of the nano-structured metamaterials. The pioneer work listed above, could stimulate the design, fabrication and potential application of metamaterials in the optical frequency range, hence is of importance in this field.