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arXiv 0906.2089physics.optics
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小金属丝表面等离子激元的反向入射激发

Oblique-incidence excitation of surface plasmon polaritons on small metal wires

Arian Kriesch

摘要:

本文报道了小直径圆柱形金属丝表面等离子激元的实验研究。应用一种新的技术,这是由该小组开发的和最近报道的,单线和线阵列样品的金(Au)和银(Ag)的小直径400 nm < D < 3 μ m和高纵横比≤ 75000的光子晶体光纤和单孔毛细管。此外,Au和Ag的有效块体金属线通过混合技术产生,包括用于13 μ m至50 μ m之间的大量不同直径的光纤锥形化和磁控管溅射沉积。测量的吸收,对应于激发的SPP模式实现了一种新的基于角度计的实验装置,在一个单一波长的斜入射激光束散射。研制了一种能同时测量不同入射角下s偏振和p偏振的散射振幅的装置。为了比较,离散SPP模式和它们的激发角的色散模型推导。计算结果是第一次比较与理论方法的电磁散射理论的圆柱体,即计算模拟Mie散射和麦克斯韦方程组的圆柱SPP的精确解。该模型的有效性被证明为更大的入射角。首次斜入射检查SPP的金属丝,这一尺寸范围的报告。在低入射角下,实验结果与散射理论的数值计算结果吻合较好。

英文摘要:

This work reports on the experimental investigation of surface plasmon polaritons (SPP) on cylindrical wires of small diameters. Applying a new technique that was developed by this group and recently reported, single wire and wire array samples of gold (Au) and silver (Ag) with small diameters 400nm < D < 3 mum and high aspect ratios <= 75000 in photonic crystal fibers and single hole capillaries are fabricated. Additionally, effective bulk metal wires of Au and Ag are created by a hybrid technique, including fiber tapering and magnetron sputter deposition for a large number of different diameters between 13 mum to 50 mum. The measurement of the absorption, corresponding to the excitation of SPP modes is realized with a new goniometer-based experimental setup for oblique incidence laser beam scattering at a single wavelength. A device is developed that allows a simultaneous measurement of the scattering amplitude in s- and p-polarization under varied incident angle. For comparison, a model for the dispersion of discrete SPP modes and their angles of excitation is derived. The computed results are for the first time compared with a theoretical approach to electromagnetic scattering theory for cylinders, that is calculated analogue to Mie scattering and to an exact solution of Maxwell's equations for cylindrical SPP. The validity of the model is proved for higher incident angles. The first oblique incidence examination of SPP on metal wires for this size range is reported. The experimental results for low incident angles show good accordance to the numerical results from scattering theory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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