Chen Chengkun, Berini Pierre
School of Information Technology and Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa K1N 6N5 Ontario, Canada.
Opt Express. 2010 Apr 12;18(8):8006-18. doi: 10.1364/OE.18.008006.
Metal gratings for in-coupling a Gaussian beam incident from broadside to the long-range surface plasmon polariton (LRSPP) propagating in one direction along a membrane-supported Au slab bounded by air or water are proposed and modeled by the finite-difference time-domain method. Grating couplers for out-coupling the propagating LRSPP into free radiation directed along broadside are also investigated. Short grating designs consisting of a small number of Au bumps yield 15% to 20% in-coupling efficiencies, and about 60% out-coupling efficiencies. LRSPP back-reflections along the membrane waveguide caused by the out-coupling grating are also calculated and discussed.
提出了用于将从侧面入射的高斯光束耦合到沿由空气或水界定的膜支撑金平板在一个方向上传播的长程表面等离子体激元极化激元（LRSPP）的金属光栅，并通过时域有限差分法进行建模。还研究了用于将传播的LRSPP耦合到沿侧面定向的自由辐射中的光栅耦合器。由少量金凸块组成的短光栅设计产生15%至20%的内耦合效率和约60%的外耦合效率。还计算并讨论了由外耦合光栅引起的沿膜波导的LRSPP背反射。
