二维典型纳米结构的非局域化光学特性研究

Study the nonlocal optical properties of typical two-dimensional nanostructures

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 the quantum effect, the characteristics of nanostructure is difficult to explain entirely based on classical mechanics method. With the development of the FDTD method, its application in the field of optics is becoming increasingly widespread. In this paper, based on finite difference time domain（FDTD） method to study the nonlocal optical properties of two-dimensional structures was applied directly. The existence conditions of local and nonlocal optical characteristics under different nanometer radius, the impact of structural shapes with their extinction cross section properties were also obtained. The numerical results clearly show that with the decrease of the nanometer structure size and the shape of the structure, the non-locality becomes more pronounced. Our theory and results can provide a reference for the practical design of new nanoscale devices.