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. 2018 Sep 12;7:65. doi: 10.1038/s41377-018-0059-0

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Combined Fourier polarimetry and holography setup, consisting of a transmission microscope, two polarimeters and a reference beam. The microscope contains a 4f-telescope for spatial filtering of light from a single antenna. b Principle of plasmonic bullseye/spiral nanostructure. Light impinging from the glass side excites the single hole in a thick metal film. SPPs launched by the hole at the air side scatter out at the spiral corrugation. The red arrows denote the directions of the SPP and free-space electric fields. c SEM micrograph of a m = −5 spiral antenna