Ukrainian Journal of Physical Optics


2025 Volume 26, Issue 1


ISSN 1816-2002 (Online), ISSN 1609-1833 (Print)

OPTICAL EDGE DISLOCATION GENERATED WITH THE NEMATIC θ-CELL

O. Krupych, T. Dudok, I. Skab, Yu. Nastishin, Z. Hrabchak, Ye. Ryzhov, O. Buluy, P. Zelenov, V. Nazarenko, O. Kurochkin and R. Vlokh

Author Information
1,2O. Krupych ORCID logo SCOPUS logo, 1T. Dudok ORCID logo SCOPUS logo, 1I. Skab ORCID logo SCOPUS logo, 3Yu. Nastishin ORCID logo SCOPUS logo, 3Z. Hrabchak ORCID logo, 3Ye. Ryzhov ORCID logo SCOPUS logo, 4O. Buluy ORCID logo SCOPUS logo, 4P. Zelenov ORCID logo, 4,5V. Nazarenko ORCID logo SCOPUS logo, 4,5O. Kurochkin ORCID logo SCOPUS logo, 1*R. Vlokh ORCID logo SCOPUS logo,
1Vlokh Institute of Physical Optics, Ivan Franko National University of Lviv, 23 Dragomanov Str., Lviv 79005, Ukraine
2Department of Optoelectronics and Information Technologies, Ivan Franko National University of Lviv, 107 Tarnavskogo Str., Lviv 79017, Ukraine
3Hetman Petro Sahaidachnyi National Army Academy, 32 Heroes of Maidan Str., Lviv 79012, Ukraine
4Institute of Physics, National Academy of Sciences of Ukraine, 46 Nauky Ave., Kyiv 03028, Ukraine
5Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
*Corresponding author: vlokh@ifo.lviv.ua

ABSTRACT

An optical edge dislocation is visualized as a shift of interference fringes in the Mach-Zehnder interferograms of the wavefront of a laser beam behind a nematic θ-cell with the circular and linear planar alignments of the nematic director on the opposite substrates. Using the approach of differential Jones matrices we establish that the half-period shift of the interference fringes addresses the π optical phase shift in the domains with the opposite handedness of the director twist on both sides of the nematic disclination separating these domains

Keywords: optical edge dislocation, optical vortex, nematic θ-cell, nematic q-plate, enantiomorphic domains, optical phase shift

UDC: 535.4, 535.5

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    На основі зміщення інтерференційних смуг на інтерферограмах Маха-Цендера нами виявлена крайова дислокація оптичного хвильового фронту лазерного пучка, який поширюється через нематичну θ–комірку з круговим і лінійним планарним розташуванням нематичного директора на протилежних підкладках. Використовуючи підхід диференціальних матриць Джонса, встановлено, що півперіодний зсув інтерференційних смуг відповідає зсуву фаз рівному π в областях із протилежним напрямком повороту директора, тобто по різні боки від нематичної дисклінації, що розділяє ці області. Ключові слова: крайова дислокація оптичного хвильвого фронту, оптичний вихор, нематична θ–комірка, нематична q-пластинка, енантіоморфні домени, зсув фаз

    Ключові слова: optical edge dislocation, optical vortex, nematic θ-cell, nematic q-plate, enantiomorphic domains, optical phase shift

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