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Journal of Atomic and Molecular Physics
Volume 2013 (2013), Article ID 451715, 4 pages
http://dx.doi.org/10.1155/2013/451715
Research Article

Generation of Multiple Focal Hole Segments Using Double-Ring Shaped Azimuthally Polarized Beam

1Department of Physics, Periyar University, Salem, Tamilnadu 636 011, India
2Department of Physics, Chikkanna Government Arts College, Trippur, Tamilnadu 641 602, India
3Department of Physical Optics, Institute of Applied Optics, 04894 Warsaw, Poland
4National Institute of Telecommunications, 04894 Warsaw, Poland

Received 17 July 2012; Revised 4 January 2013; Accepted 18 February 2013

Academic Editor: Mark D. Havey

Copyright © 2013 K. Lalithambigai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigated the focusing properties of a double-ring-shaped azimuthally polarized beam tightly focused with a high NA lens and a binary phase filter. We observe that by using 3 belts and 5 belts binary phase filters novel focal patterns including splitting of focal rings and multiring focus are obtained. We also found that a suitably designed phase structure can shift the focal rings along optical axis. The author expects such investigation is worthwhile for optical manipulation and material processing technologies.