Kato Keisuke, Ono Atsushi, Inami Wataru, Kawata Yoshimasa
Department of Mechanical Engineering, Shizuoka University, Naka, Hamamatsu, Japan.
Opt Express. 2010 Jun 21;18(13):13580-5. doi: 10.1364/OE.18.013580.
We propose an excitation method for the localization of photons at the apex of a metal coated axicon prism. The cone angle of the prism and the metallic film thickness are designed to match the excitation conditions for surface plasmons. The plasmons propagate along the sides of the prism and converge at its apex. The resulting nanofocusing was investigated by simulating the intensity distributions around the apex of the prism using a finite-difference time-domain algorithm. For incident radial polarization, a localized and field enhanced spot is generated by the constructive interference of surface plasmons.
我们提出了一种用于在金属包覆轴棱锥棱镜顶点处定位光子的激发方法。设计棱镜的锥角和金属膜厚度以匹配表面等离子体激元的激发条件。等离子体激元沿棱镜的侧面传播并在其顶点处汇聚。通过使用时域有限差分算法模拟棱镜顶点周围的强度分布，研究了由此产生的纳米聚焦现象。对于入射的径向偏振光，表面等离子体激元的相长干涉会产生一个局域化且场增强的光斑。
