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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(FDTD)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FDTD方法研究了典型二维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.
Due to the existence of quantum effect, the properties of nanoscale structures are difficult to explain completely based on classical mechanics, and its optical properties are hard to be obtained by classical methods. With the development of FDTD method, Has become more and more widely.According to the FDTD method, the nonlocal optical properties of typical two-dimensional nanostructures are studied and the existence conditions of the local and non-local optical properties of different nanoscale structures are obtained. The structure Shape on its extinction cross-section characteristics.The results of calculation and analysis show that with the decrease of the size of the nanostructures and the abrupt change of shape, the non-localized structure becomes more obvious.Our theory and results can be used to design the actual small-scale nanodevices Provide a reference basis.