中国物理B ›› 2011, Vol. 20 ›› Issue (8): 87302-087302.doi: 10.1088/1674-1056/20/8/087302
谢素霞1, 周昕1, 付少丽2, 徐海清2, 夏辉2, 李宏建3
Fu Shao-Li(付少丽)a), Li Hong-Jian(李宏建) a)b), Xie Su-Xia(谢素霞)b), Zhou Xin(周昕)b), Xu Hai-Qing(徐海清)a), and Xia Hui(夏辉)a)†
摘要: We theoretically investigate the influence of the shape of nanoholes on plasmonic behaviours in coupled elliptical metallic nanotube arrays by the finite-difference time-domain (FDTD) method. We study the structure in two cases: one for the array aligned along the minor axis and the other for the array aligned along the major axis. It is found that the optical properties and plasmonic effects can be tuned by the effective surface charges as a result of the variation in the minor axis length. Based on the localized nature of electric field distributions, we also clearly show that the presence of localized plasmon resonant modes originates from multipolar plasmon polaritons and a large magnitude of opposing surface charges build up in the gap between adjacent nanotubes.
中图分类号: (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))