【作者】 方明； 李翔； 沙威； 黄志祥； 吴先良；

【Author】 Ming fang;xiang li;wei e.I.Sha;zhixiang huang;xianliang wu;Key Laboratory of Intelligent Computing and Signal Processing of Anhui University;Department of Electrical and Electronic Engineering the University of Hong Kong;

【机构】 安徽大学电子信息工程学院； 香港大学电机电子工程系；

【摘要】 由于量子效应的存在,纳米尺度结构所具有的特性很难完全基于经典力学来解释,其光学特性也难以采用经典方法得到。随着时域有限差分方法的发展,其在光学领域中的应用变得越来越广泛。论文基于时域有限差分方法研究了典型纳米结构的非局域光学特性,得到了不同纳米尺度结构的局域和非局域性光学特性存在的条件,分析了结构形状对其消光截面特性的影响。计算与分析结果表明随着纳米结构尺寸的减小及形状的突变,结构的非局域性越明显。我们的理论及结果可为实际小尺度纳米器件的设计提供参考依据。更多还原

【Abstract】 Due to the existing of quantum effect, characteristics of nanostructure are difficult to be understood solely by classical mechanics. The optical characteristics of nanostructure cannot be described by classical methods also. With the development of finite-difference time-domain(FDTD) method, its application in the field of optics becomes very diverse. In this paper, using FDTD method, we study nonlocal optical properties of typical nanostructures. Both the local and nonlocal optical characteristics under different-sized nanostructures conditions and the influence of nanostructure geometries on extinction cross section are analyzed. Numerical results show that nanostructures, with the decreased size and suddenly-changed shapes, have more pronounced non-locality. Our theory and results could provide a guideline for practical designs of nanoscale devices.更多还原