Plasmonic polarization multiplexers are becoming increasingly significant for the development of high-speed plasmonic interconnection with broad bandwidth. Here, we demonstrate that the symmetrical double-groove structure can act as a polarization multiplexer for broadband femtosecond surface plasmon polaritons (SPPs) by investigating the mode distributions with photoemission electron microscopy (PEEM). Experimental results show that the mode distribution of the SPPs field from the excitation of the double-groove structure is symmetrical when irradiated with p-polarized light, whereas the mode shows an anti-symmetric field distribution as a staggered, herringbone shape with s-polarized light excitation. Furthermore, the SPPs field distribution shows an asymmetrical mode when the double-groove is excited with a left or right-handed circular femtosecond laser pulse. The resulting PEEM images are supported by FDTD simulations. The proposed multiplexer is a promising building block for highly integrated optoelectronic integrated circuits.

中文翻译：

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对称双槽结构作为宽带等离子体偏振复用器

等离子体偏振复用器对于具有宽带宽的高速等离子体互连的开发变得越来越重要。在这里，我们通过使用光电电子显微镜 (PEEM) 研究模式分布，证明对称双槽结构可以充当宽带飞秒表面等离子体激元 (SPP) 的偏振复用器。实验结果表明，当用 p 偏振光照射时，双槽结构激发产生的 SPPs 场的模式分布是对称的，而模式则显示出反对称场分布，为具有 s 偏振的交错人字形形状。光激发。此外，当用左旋或右旋圆形飞秒激光脉冲激发双槽时，SPPs 场分布显示出不对称模式。FDTD 模拟支持生成的 PEEM 图像。所提出的多路复用器是高度集成的光电集成电路的有前途的构建块。