Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.optcom.2009.08.058
Title: Bessel beams: Effects of polarization
Authors: Sheppard, C.J.R. 
Rehman, S. 
Balla, N.K.
Yew, E.Y.S. 
Teng, T.W. 
Keywords: Bessel beams
Focal spot
Polarization
Issue Date: 15-Dec-2009
Source: Sheppard, C.J.R., Rehman, S., Balla, N.K., Yew, E.Y.S., Teng, T.W. (2009-12-15). Bessel beams: Effects of polarization. Optics Communications 282 (24) : 4647-4656. ScholarBank@NUS Repository. https://doi.org/10.1016/j.optcom.2009.08.058
Abstract: An approximation to a Bessel beam produced by tightly focusing linearly polarized light is known to produce a smaller central lobe than focusing plane polarized light. This is because the plane polarized wave gives a broad central lobe caused mainly by a parasitic longitudinal field component. It is known that this problem can be overcome by focusing radially polarized light. Here we demonstrate that other polarization distributions based on a linear combination of transverse electric (TE1) and transverse magnetic (TM1) fields can give a beam even narrower than for the radially polarized case. Special cases of this combination are identified, corresponding to the smallest width (TE1), and the maximum peak intensity compared with the side lobes (electric dipole polarization). Axially-symmetric forms can be generated by illumination with elliptically polarized light. A particular case is azimuthal polarization with a phase singularity, which is equivalent to TE1. For a semi-angular aperture of 60°, the TE1 case gives a central lobe width 9% narrower than for radially polarized illumination, while for plane polarized illumination it is 12% wider than the radially polarized case. © 2009 Elsevier B.V. All rights reserved.
Source Title: Optics Communications
URI: http://scholarbank.nus.edu.sg/handle/10635/66941
ISSN: 00304018
DOI: 10.1016/j.optcom.2009.08.058
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