Yin Leilei, Vlasko-Vlasov Vitali K, Pearson John, Hiller Jon M, Hua Jiong, Welp Ulrich, Brown Dennis E, Kimball Clyde W
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Nano Lett. 2005 Jul;5(7):1399-402. doi: 10.1021/nl050723m.
The constructive interference of surface plasmon polaritons (SPP) launched by nanometric holes allows us to focus SPP into a spot of high near-field intensity having subwavelength width. Near-field scanning optical microscopy is used to map the local SPP intensity. The resulting SPP patterns and their polarization dependence are accurately described in model calculations based on a dipolar model for the SPP emission at each hole. Furthermore, we show that the high SPP intensity in the focal spot can be launched and propagated on a Ag strip guide with a 250 x 50 nm2 cross section, thus overcoming the diffraction limit of conventional optics. The combination of focusing arrays and nano-waveguides may serve as a basic element in planar nano-photonic circuits.
由纳米孔发射的表面等离激元极化激元（SPP）的相长干涉，使我们能够将SPP聚焦到一个具有亚波长宽度的高近场强度光斑中。利用近场扫描光学显微镜对局部SPP强度进行映射。基于每个孔处SPP发射的偶极子模型的模型计算，准确描述了所得的SPP图案及其偏振依赖性。此外，我们表明，焦斑中的高SPP强度可以在横截面为250×50 nm2的银带波导上发射和传播，从而克服了传统光学的衍射极限。聚焦阵列和纳米波导的组合可作为平面纳米光子电路中的基本元件。
