21 April 2016 Behavior of asymmetric Bessel beam in focal plane of high numerical aperture objective
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Abstract
Tight focusing of a linearly-polarized asymmetric Bessel beam, which has a crescent profile, was investigated numerically and experimentally. FDTD calculations show that a binary zone plate of numerical aperture NA = 0.995 forms a crescent in the focal plane, which is rotated clockwise around the optical axis, moving away from the focal plane. Using the Debye formulae it was shown that a direction of polarization of incident light has a significant influence on intensity distribution in focal plane. The crescent in the focal plane was also observed experimentally by focusing of the asymmetric Bessel beam using an immersive objective (NA = 1.25).
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Sergey S. Stafeev, Victor V. Kotlyar, Alexey P. Porfirev, "Behavior of asymmetric Bessel beam in focal plane of high numerical aperture objective ", Proc. SPIE 9917, Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS), 991736 (21 April 2016); doi: 10.1117/12.2229749; https://doi.org/10.1117/12.2229749
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