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Analysis of the formation of a longitudinally polarized optical needle by a lens and axicon under tightly focused conditions

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Abstract

We analyze various techniques for producing a thin needle of light in which the electric field is longitudinally polarized. We consider the use of variously polarized laser beams tightly focused by a spherical lens or by large-aperture refractive or diffractive axicons. The simulations were performed using integral propagators and the numerical finite-element method. We show that a diffractive axicon is the best component for producing an elongated longitudinally polarized optical needle.

© 2016 Optical Society of America

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