论文标题
通过无衍射和矢量梁激发表面等离子体极化子
Excitation of Surface Plasmon Polaritons by Diffraction-Free and Vector Beams
论文作者
论文摘要
传统上，表面等离子体极化子（spps）是通过聚焦横向磁性（TM）高斯束的瑞利范围内的平面波激发的。在这里，我们研究并确认了SPPS与二维高斯和Bessel-Gauss波浪包之间的耦合，以及一维轻质纸和时空波小包。我们用空间变化的极化状态编码传入的波前，然后将相应的径向和方位角矢量梁谱的TM分量融合在一起，以确认SPP极化相关和空间模式的选择性。我们的结果不需要通过定期波纹金属表面进行材料优化或多维限制，以在更大的范围内实现耦合。因此，概述了远程生物传感器和全光集成等离激元电路的发展的关键但通常被忽视的路径。
Surface plasmon polaritons (SPPs) are traditionally excited by plane waves within the Rayleigh range of a focused transverse magnetic (TM) Gaussian beam. Here, we investigate and confirm the coupling between SPPs and two-dimensional Gaussian and Bessel-Gauss wave packets, as well as one-dimensional light sheets and space-time wave packets. We encode the incoming wavefronts with spatially varying states of polarization then couple the respective TM components of radial and azimuthal vector beam profiles to confirm SPP polarization-correlation and spatial-mode selectivity. Our results do not require material optimization or multi-dimensional confinement via periodically corrugated metal surfaces to achieve coupling at greater extents. Hereby, outlining a pivotal, yet commonly overlooked, path towards the development of long-range biosensors and all-optical integrated plasmonic circuits.
