Rotation of two-petal laser beams in the near field of a spiral microaxicon
Stafeev S.S., O'Faolain L., Kotlyar M.V.

 

Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Samara, Russia,
Samara National Research University, Samara, Russia,
Cork Institute of Technology, Ireland

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Abstract:
Using a spiral microaxicon with the topological charge 2 and NA = 0.6 operating at a 532-nm wavelength and fabricated by electron-beam lithography, we experimentally demonstrate the rotation of a two-petal laser beam in the near field (several micrometers away from the axicon surface). The estimated rotation rate is 55 °/mm and linearly dependent on the on-axis distance, with the theoretical rotation rate being 53 °/mm. The experimentally measured rotation rate is found to be linear and coincident with the simulation results only on the on-axis segment from 1.5 to 3 mm. The experimentally measured rotation rate is 66 °/mm on the initial on-axis segment from 0 to 1.5 mm and 34 °/mm on the final segment of the beam path from 3 to 4.5 mm. The experimentally achieved rotation rate is higher than rotation rates of similar two-petal laser beams reported to date.

Keywords:
binary optics, near field microscopy, optical vortex, rotating beams.

Citation:
Stafeev SS, O'Faolain L, Kotlyar MV. Rotation of two-petal laser beams in the near field of a spiral microaxicon. Computer Optics 2018; 42 (3): 385-391. DOI: 10.18287/2412-6179-2018-42-3-385-391.

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