Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions

Abstract A polarization microscopy method to investigate the orientational structures and boojums formed in the chiral and achiral nematic layers under conical (tilted) boundary conditions has been developed. Oblique light incidence on nematic layer is used, due to which the phase difference between...

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Autor principal:	Mikhail N. Krakhalev
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3ec38599558942e8bc9b81d966123481
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spelling	oai:doaj.org-article:3ec38599558942e8bc9b81d9661234812021-12-02T17:51:12ZOblique light incidence method to study topological defects in nematic layers with conical boundary conditions10.1038/s41598-021-96784-92045-2322https://doaj.org/article/3ec38599558942e8bc9b81d9661234812021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96784-9https://doaj.org/toc/2045-2322Abstract A polarization microscopy method to investigate the orientational structures and boojums formed in the chiral and achiral nematic layers under conical (tilted) boundary conditions has been developed. Oblique light incidence on nematic layer is used, due to which the phase difference between the ordinary and extraordinary waves depends on the director’s azimuthal angle. The phase difference gets maximal when the director azimuthal angle of achiral nematic $$\varphi (x,y) = 0$$ φ ( x , y ) = 0 and an azimuthal angle at the center of the chiral nematic layer $$\varphi _0(x,y) = 0$$ φ 0 ( x , y ) = 0 independently of the total twist angle $$\varphi _{TOTAL}$$ φ TOTAL . It has been found that the $$m=+1$$ m = + 1 boojums with the phase $$\xi = \pm 90^\circ$$ ξ = ± 90 ∘ and $$\xi = (-90^\circ + \varphi _{TOTAL}/2)$$ ξ = ( - 90 ∘ + φ TOTAL / 2 ) are formed in achiral and chiral nematics, respectively, at the director tilt angle $$\theta _{d/2} \cong 40^\circ$$ θ d / 2 ≅ 40 ∘ at the interface. In addition, the defectless structure of chiral nematic with the periodically variable azimuthal director angle on the substrates has been studied.Mikhail N. KrakhalevNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mikhail N. Krakhalev Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions
description	Abstract A polarization microscopy method to investigate the orientational structures and boojums formed in the chiral and achiral nematic layers under conical (tilted) boundary conditions has been developed. Oblique light incidence on nematic layer is used, due to which the phase difference between the ordinary and extraordinary waves depends on the director’s azimuthal angle. The phase difference gets maximal when the director azimuthal angle of achiral nematic $$\varphi (x,y) = 0$$ φ ( x , y ) = 0 and an azimuthal angle at the center of the chiral nematic layer $$\varphi _0(x,y) = 0$$ φ 0 ( x , y ) = 0 independently of the total twist angle $$\varphi _{TOTAL}$$ φ TOTAL . It has been found that the $$m=+1$$ m = + 1 boojums with the phase $$\xi = \pm 90^\circ$$ ξ = ± 90 ∘ and $$\xi = (-90^\circ + \varphi _{TOTAL}/2)$$ ξ = ( - 90 ∘ + φ TOTAL / 2 ) are formed in achiral and chiral nematics, respectively, at the director tilt angle $$\theta _{d/2} \cong 40^\circ$$ θ d / 2 ≅ 40 ∘ at the interface. In addition, the defectless structure of chiral nematic with the periodically variable azimuthal director angle on the substrates has been studied.
format	article
author	Mikhail N. Krakhalev
author_facet	Mikhail N. Krakhalev
author_sort	Mikhail N. Krakhalev
title	Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions
title_short	Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions
title_full	Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions
title_fullStr	Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions
title_full_unstemmed	Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions
title_sort	oblique light incidence method to study topological defects in nematic layers with conical boundary conditions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3ec38599558942e8bc9b81d966123481
work_keys_str_mv	AT mikhailnkrakhalev obliquelightincidencemethodtostudytopologicaldefectsinnematiclayerswithconicalboundaryconditions
_version_	1718379280325410816

Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions

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