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. 2016 Feb 26;5(2):e16034. doi: 10.1038/lsa.2016.34

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Copyright © 2016 Changchun Institute of Optics, Fine Mechanics and Physics

This work is licensed under a Creative Commons Attribution 4.0 Unported License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permissionfromthe license holder to reproduce thematerial.To viewa copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) SEM micrograph of three-period nanostructures to synthesize the PAB, which is a special case of the PWB under paraxial approximation. x₀=0.5 μm, r₀=15 μm, and b=0.02. (b) NSOM measurement results of near-field electric field intensity distribution. (c) Zoom-in view of the blue box area in (b). For quantitative comparison and comprehensive evaluation of the beam properties, we give the line-to-line intensity distributions from 0 to 5 µm in a step of 1 µm obtained from the analytical formula, NSOM measurement, and FDTD calculation in (d), (e), and (f), respectively.