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Inversion of the longitudinal component of spin angular momentum in the focus of a left-handed circularly polarized beam
A.G. Nalimov 1,2, E.S. Kozlova 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

 PDF, 1048 kB

DOI: 10.18287/2412-6179-CO-761

Pages: 699-706.

Full text of article: Russian language.

Abstract:
It has been shown theoretically and numerically that in the sharp focus of a circularly polarized optical vortex, the longitudinal component of the spin angular momentum vector is inverted. Moreover, if the input light to the optical system is left-hand circularly polarized, it has been shown to be right-hand polarized in the focus near the optical axis. Since this effect occurs near the focus where a backward energy flow takes place, such an inversion of the spin angular momentum can be used to detect the backward energy flow.

Keywords:
spin angular momentum, right-hand circular polarization, optical vortex, backward energy flow, optical torque.

Citation:
Nalimov AG, Kozlova ES. Inversion of the longitudinal component of spin angular momentum in the focus of a left-handed circularly polarized beam. Computer Optics 2020; 44(5): 699-706. DOI: 10.18287/2412-6179-CO-761.

Acknowledgements:
The work was partly funded by the Russian Foundation for Basic Research under grant #18-29-20003 (Section "Spin angular momentum in the focus of a circularly polarized optical vortex with topological charge 2"), the Russian Science Foundation under grant #18-19-00595 ("Spin angular momentum in the focus of a circularly polarized Gaussian beam" and "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" and "Conclusion").

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