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Dinamična tekočekristalna celica za nadzor in oblikovanje disklinacijskih linij
ID Horvat, Martin (Author), ID Osterman, Natan (Mentor) More about this mentor... This link opens in a new window

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Abstract
Disklinacijske linije so enodimenzionalni topološki defekti v orientacijskem redu nematskih tekočih kristalov in so pomembna tema sodobne fizike mehke snovi. Zanimive so zaradi interakcije s koloidi in svetlobo, hkrati pa lahko služijo kot testni sistemi za topološke defekte v drugih vejah fizike. V tem magistrskem delu sem se osredotočil na razvoj eksperimentalnega sistema, v katerega z rotacijo površine tekočekristalne celice vnašam elastično energijo, kar povzroči deformacijo disklinacijske linije med površinskima defektoma. Uporabnost sistema sem nato demonstriral z eksperimentom z osnovnim Frank-Readovim izvorom s točkovnima defektoma s topološkim nabojem +1/2 in -1/2 ter z nadgrajenim izvorom s topološkima nabojema +1 in -1. Na koncu sem izvedel še eksperiment oblikovanja poljubne deformacije disklinacijske linije z rotacijo celice.

Language:Slovenian
Keywords:Frank-Readov izvor, topološki defekti, disklinacijska linija, dinamična celica, nematski tekoči kristali
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FMF - Faculty of Mathematics and Physics
Year:2026
PID:20.500.12556/RUL-187630 This link opens in a new window
COBISS.SI-ID:291328515 This link opens in a new window
Publication date in RUL:12.09.2026
Views:103
Downloads:34
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Secondary language

Language:English
Title:Dynamic liquid crystal cell for the control and shaping of disclination lines
Abstract:
Disclination lines are one-dimensional topological defects in the orientational order of nematic liquid crystals and represent an important topic in modern soft matter physics. They are of significant interest due to their interactions with colloids and light, while also serving as model systems for studying topological defects across other branches of physics. In this master's thesis, I focused on the development of an experimental system where elastic energy is injected into a liquid crystal cell via the rotation of its surfaces, resulting in the deformation of a disclination line between two surface defects. I demonstrated the utility of this system through an experiment featuring a basic Frank-Read source consisting of two point defects with topological charges +1/2 and -1/2, followed by an upgraded version with +1 and -1 topological charges. Finally, I performed an experiment demonstrating the generation of arbitrary disclination line deformations through controlled cell rotation.

Keywords:Frank-Read source, topological defects, disclination line, dynamic cell, nematic liquid crystals

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