Ukrainian Journal of Physical Optics


2024 Volume 25, Issue 1


ISSN 1609-1833 (Print)

COMPOSITE VORTEX BEAM GENERATION USING DICHROIC NEMATIC LIQUID CRYSTAL CELL WITH TOPOLOGICAL DEFECT

O.Krupych1,2, T.Dudok1, O.Mys1, M.Kostyrko1, I.Skab1, Yu.Nastishin3, T.Lavrut3, Yu.Chahan3, V.Nazarenko4, O.Kurochkin4 and R.Vlokh1

1Vlokh Institute of Physical Optics, 23 Dragomanov Str., 79005, Lviv, Ukraine
2Ivan Franko Lviv National University, Department of optoelectronics and information technologies, 107 Tarnavsy Str, 79012, Lviv, Ukraine
3Hetman Petro Sahaidachnyi National Army Academy, 32, Heroes of Maidan St., Lviv, 79026, Ukraine
4Institute of Physics of the National Academy of Sciences of Ukraine, 46 Nauky Aven., 03028, Kyiv, Ukraine

ABSTRACT

We demonstrate both theoretically and experimentally that a linearly polarized optical beam incident on a linearly dichroic nematic liquid crystal cell with a topological defect of the topological strength q and linear dichroism, transforms into a composite vector beam consisting of elementary vector beams with the polarization singularity orders m=2q and m=q. Consequently, it has been proved that due to the linear dichroism a liquid crystal defect of the topological strength q=1 transforms an incident circularly polarized beam into a composite vortex beam consisting of the double-charged vortex beam and vector-vortex beam with polarization order and topological charge that are equal to unity.

Keywords: composite vortex beam, composite vector beam, topological defect, dichroism, liquid crystals

UDC: 535.5

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    Теоретично та експериментально показано, що при падінні лінійно поляризованого оптичного пучка на рідкокристалічну комірку з топологічним дефектом з силою, рівною q та лінійним дихроїзмом, пучок, що виходить, містить композитний векторний пучок з елементарними векторними пучками з порядками поляризації m=2q і m=q. Таким чином, доведено, що при q=1 для падаючого циркулярно поляризованого пучка наявність дихроїзму приводить до появи композитного вихрового пучка, що складається з вихрового пучка з подвійним зарядом та векторно-вихрового пучка з порядком поляризації та топологічним зарядом, що дорівнюють одиниці.

    Ключові слова: composite vortex beam, composite vector beam, topological defect, dichroism, liquid crystals

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