Polarization resolved light splitting of single plasmonic nanowire emission
Polarization resolved light splitting of single plasmonic nanowire emission
复制标题
单等离子体纳米线发射的偏振解析光分裂
DOI：
10.1117/12.2544180
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Li Zhipeng
中科院分区：
文献类型：
--
作者：
Yang Longkun;Li Pan;Li Zhipeng
金属纳米线是未来集成纳米光子器件和电路中不可或缺的功能元件。在这项工作中，通过偏振测量，我们揭示了从一个厚纳米线（D类似于300 nm）的传播表面等离子体激元发射分裂成两个部分：I-1和I-2，与偏振几乎垂直于各自的发射面。通过改变激发偏振态，可以进一步调节分光比（I-1/I-2）。这种单根粗纳米线中的分光机制是由于沿纳米线沿着传播的表面等离子体激元模式的干涉，其调制端面处的场分布。这些发现表明，具有明确定义的端面的单根厚银纳米线可以自然地提供多个外耦合通道，并用作简单的纳米级偏振分束器。这一工作为我们理解表面等离子体的传播和发射提供了新的思路，对波导设计和集成等离子体器件的发展具有重要意义。
Crystalline metallic nanowires have been indispensable "building-blocks" to construct functional elements for future integrated nano-photonic devices and circuits. In this work, by the polarization measurements, we reveal that the propagating surface plasmons emission from a thick nanowire (D similar to 300 nm) are splitted into two parts: I-1 and I-2, with the polarizations nearly perpendicular to the respective emitting facets. By changing excitation polarization, splitting ratio (I-1/I-2) can be further tuned. The light splitting mechanism in this single thick nanowire is due to the interference of propagating surface plasmons modes along the nanowire, which modulates field distribution at the end facets. These findings demonstrate that single thick silver nanowire with well-defined end facets can naturally provide multiple outcoupling channels and function as a simple nanoscale polarization beam splitter. This work sheds a new light on our understanding about surface plasmons propagation and emission, and would certainly benefit the development of waveguides design and integrated plasmonic devices.