Focusing Radially Polarized Light by a Concentrically Corrugated Silver Film without a Hole

Piotr Wróbel, Jacek Pniewski, Tomasz J. Antosiewicz, and Tomasz Szoplik
Phys. Rev. Lett. 102, 183902 – Published 8 May 2009

Abstract

We report a phenomenon of focusing a radially polarized beam from the visible range by a silver film with no hole on the optical axis and double-sided concentric corrugations. The axes of symmetry of grooves and the illuminating beam coincide. An Ag lens of 100 nm thickness, five grooves, of which the outermost has 5μm diameter, at λ=400nm transmits 22% of electric energy and focuses light into a 0.2λ2 spot area at a focal length close to 2λ, while at λ=500nm the results are 11%, 0.16λ2 and λ, respectively. This Ag lens focuses without contribution of evanescent waves a far-field source into a far-field spot. The nanolens acts like a refractive optical system of high numerical aperture close to unity.

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  • Received 15 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.183902

©2009 American Physical Society

Authors & Affiliations

Piotr Wróbel*, Jacek Pniewski, Tomasz J. Antosiewicz, and Tomasz Szoplik

  • Faculty of Physics, University of Warsaw, Pasteura 7, 02-093 Warsaw, Poland

  • *Corresponding author. piotr.wrobel@igf.fuw.edu.pl

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Vol. 102, Iss. 18 — 8 May 2009

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