利用径向偏振光照射的等离子体透镜实现纳米聚焦的演示。

Demonstration of nanofocusing by the use of plasmonic lens illuminated with radially polarized light.

作者信息

Lerman Gilad M, Yanai Avner, Levy Uriel

机构信息

Department of Applied Physics, The Benin School of Engineering and Computer Science, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.

出版信息

Nano Lett. 2009 May;9(5):2139-43. doi: 10.1021/nl900694r.

DOI:10.1021/nl900694r

PMID:19391611

Abstract

We experimentally demonstrate the focusing of surface plasmon polaritons by a plasmonic lens illuminated with radially polarized light. The field distribution is characterized by near-field scanning optical microscope. A sharp focal spot corresponding to a zero-order Bessel function is observed. For comparison, the plasmonic lens is also measured with linearly polarized light illumination, resulting in two separated lobes. Finally, we verify that the focal spot maintains its width along the optical axis of the plasmonic lens. The results demonstrate the advantage of using radially polarized light for nanofocusing applications involving surface plasmon polaritons.

摘要

我们通过用径向偏振光照射的等离子体透镜，实验证明了表面等离激元极化激元的聚焦。用场分布通过近场扫描光学显微镜进行表征。观察到对应于零阶贝塞尔函数的尖锐焦点。作为对比，还用线偏振光照射对该等离子体透镜进行了测量，结果产生了两个分开的瓣。最后，我们验证了焦点沿等离子体透镜的光轴保持其宽度。结果证明了在涉及表面等离激元极化激元的纳米聚焦应用中使用径向偏振光的优势。