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Dichroic directional excitation of surface plasmon based on an integer-programming model

机译:基于整数编程模型的表面等离子体激元的二向定向激发

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摘要

A silver film perforated with two subwavelength uniform slits is proposed for dichroic directional excitation of surface plasmon polaritons (SPPs). Under backside oblique illumination, the SPPs for two work wavelengths can propagate along the two opposite directions or in the same direction. Based on SPP interference, an integer-programming model is established for dichroic directional excitation of SPPs. The branch and bound method is introduced to find the optimal solutions for the integer-programming model, and therefore, the parameters of the structure and illumination angles can be obtained. The field distribution of the structure is investigated by using the finite-difference time-domain method (FDTD) to verify our design. Our theoretical model can achieve dichroic directional excitation of SPPs, simultaneously. (C) 2015 Optical Society of America
机译:提出了一种带有两个亚波长均匀狭缝的银膜,用于表面等离激元极化子(SPPs)的二向色性激发。在背面倾斜照明下,两个工作波长的SPP可以沿两个相反的方向或相同的方向传播。基于SPP干扰,建立了SPP二向色性激励的整数规划模型。通过引入分支定界法来寻找整数规划模型的最优解,从而可以得到结构参数和照明角度。通过使用时域有限差分法(FDTD)研究结构的场分布,以验证我们的设计。我们的理论模型可以同时实现SPP的二向色定向激励。 (C)2015年美国眼镜学会

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