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Abstract:
We conduct the numerical and experimental study of sharp focusing of a linearly polarized asymmetric Bessel beam with topological charge n = 3 and a crescent-shaped transverse intensity pattern. Using the Debye integral, we show that in the focal plane of a high NA aplanatic lens (NA = 0.9 – 0.95) the intensity distribution is also crescent-shaped.  Using the FDTD method it is shown that a binary zone plate with NA = 0.995 also forms a crescent-shaped focal spot that is rotated around the optical axis. An asymmetric Bessel beam was generated using a spatial light modulator (SLM) and focused using an immersion objective with NA = 1.25. A crescent-shaped intensity pattern formed in the focal plane was rotated by 90 degrees relative to the SLM-aided crescent.

Keywords:
optical vortices; propagation; modes.

Citation:
Kotlyar VV, Stafeev SS, Porfirev AP. Sharp focusing of linearly polarized asymmetric Bessel beam. Computer Optics 2015; 39(1): 36-44. DOI: 10.18287/0134-2452-2015-39-1-36-44.

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