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Transport properties of optical fibres with high numerical apertures
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SYSNO ASEP 0535619 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Transport properties of optical fibres with high numerical apertures Author(s) Tyc, Tomáš (UPT-D) ORCID
Simpson, Stephen Hugh (UPT-D) RID, SAI
Čižmár, Tomáš (UPT-D) RID, ORCID, SAINumber of authors 3 Article number 112970Y Source Title Complex Light and Optical Forces XIV 2020. Proceedings of SPIE, 11297. - Bellingham : SPIE, 2020 - ISSN 0277-786X - ISBN 978-151063357-5 Number of pages 8 s. Publication form Print - P Action Complex Light and Optical Forces 2020 /14./ Event date 04.02.2020 - 05.02.2020 VEvent location San Francisco Country US - United States Event type WRD Language eng - English Country US - United States Keywords optical fibre ; polarization ; spin-orbit coupling Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects EF15_003/0000476 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LO1212 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UPT-D - RVO:68081731 UT WOS 000552296600015 EID SCOPUS 85082708144 Annotation We theoretically examine the transport properties of non-ideal optical fibres with high numerical aperture. Using a simple spectral method, we derive the modes in perturbed or non-ideal fibres from the numerically evaluated modes of circularly symmetric fibres. We then consider the propagation through the fibre of Gaussian spots, projected onto the distal fibre end. The incident spots are of uniform, arbitrary polarization and positioned at any point on the fibre facet. We then evaluate the effect of propagation through the fibre in terms of various indices. In particular, we consider the motion of the centre of energy, the average polarization state and the average spin and orbital angular momentum. The study includes both step index and graded index optical fibres with symmetric and chiral deformations. We observe a fundamental difference between propagation in step index and graded index optical fibres: in the latter case, the centre of energy converges to the fibre axis as the light propagated along the fibre and in the former it moves erratically about the transverse plane. In addition, we find that circular polarization states are preserved for cylindrically symmetric fibres, of arbitrarily high numerical aperture. However, this property is destroyed by relatively weak deformations of the fibre.We theoretically examine the transport properties of non-ideal optical fibres with high numerical aperture. Using a simple spectral method, we derive the modes in perturbed or non-ideal fibres from the numerically evaluated modes of circularly symmetric fibres. We then consider the propagation through the fibre of Gaussian spots, projected onto the distal fibre end. The incident spots are of uniform, arbitrary polarization and positioned at any point on the fibre facet. We then evaluate the effect of propagation through the fibre in terms of various indices. In particular, we consider the motion of the centre of energy, the average polarization state and the average spin and orbital angular momentum. The study includes both step index and graded index optical fibres with symmetric and chiral deformations. We observe a fundamental difference between propagation in step index and graded index optical fibres: in the latter case, the centre of energy converges to the fibre axis as the light propagated along the fibre and in the former it moves erratically about the transverse plane. In addition, we find that circular polarization states are preserved for cylindrically symmetric fibres, of arbitrarily high numerical aperture. However, this property is destroyed by relatively weak deformations of the fibre. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2021
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