Sub-wavelength confinement of the orbital angular momentum of light probed by plasmonic nanorods resonances

被引：12
作者：
Carli, Marta [1 ]
Zilio, Pierfrancesco [1 ]
Garoli, Denis [1 ]
Giorgis, Valentina [2 ]
Romanato, Filippo [1 ,2 ]
机构：
[1] Univ Padua, Dept Phys & Astron, I-35131 Padua, Italy
[2] CNR IOM, Trieste, Italy
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 21期
关键词：
METASURFACES; LENSES;
D O I：
10.1364/OE.22.026302
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We discuss how the topological charge of an OAM-carrying plasmon (Plasmonic Vortex) can be probed by monitoring the near-field response of plasmonic nanostructures suitably arranged inside a Plasmonic Vortex Lens. The turning "on" or "off" of four gold nanorods, detected by a Scanning Near field Optical Microscope (SNOM), acts as a fingerprint of the OAM state of the PV at the nanoscale. Different configurations are studied numerically, the integrated structure is fabricated and near field characterization is performed for a particularly meaningful case. (C) 2014 Optical Society of America
引用
收藏
页码：26302 / 26311
页数：10
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