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Linear to circular polarization conversion in the sharp focus of an optical vortex
A.G. Nalimov 1,2, S.S. Stafeev 1,2
1 IPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS,
443001, Samara, Russia, Molodogvardeyskaya 151,
2 Samara National Research University, 443086, Samara, Russia, Moskovskoye Shosse 34
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Full text of article: Russian language.
We have shown that when sharply focusing a linearly polarized optical vortex with topological charge 2, in the near-axis region of the focal plane, not only does a reverse energy flow (the negative on-axis projection of the Poynting vector) occur, but also the right-handed circular polariza-tion of light. Moreover, due to spin-orbital angular momentum conversion, the on-axis polarization vector and the transverse energy flow rotate around the optical axis in the same direction (counter-clockwise). If an absorbing spherical microparticle is put in the focus on the optical axis, it will rotate around the axis and around its center of mass counterclockwise. Numerical simulation results confirms the theoretical predictions.
polarization conversion, optical torque, optical tweezers, Maxwell stress tensor, rotation.
Nalimov AG, Stafeev SS. Linear to circular polarization conversion in the sharp focus of an optical vortex. Computer Optics 2021; 45(1): 13-18. DOI: 10.18287/2412-6179-CO-778.
The work was partly funded by the Russian Foundation for Basic Research under grant # 18-29-20003 ("Energy flow and SAM in the focus"), the Russian Science Foundation under grant # 18-19-00595 ("Simulation"), and by the RF Ministry of Science and Higher Education within a state contract with the "Crystallography and Photonics" Research Center of the RAS ("Introduction", "Conclusion").
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