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Topological defects of optical indicatrix orientation associated with the edge structural dislocations in crystals 

Savaryn V., Vasylkiv Yu., Skab I. and Vlokh R.

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Abstract. We have analyzed the effect of edge structural dislocations in solid-crystalline structures on the topology of optical indicatrix parameters. It has been found that consideration of strict boundary conditions leads to zeroing of the stress tensor components in the vicinity of dislocation core. Subsequently, piezooptically induced birefringence in the vicinity of the dislocation core conditions the appearance of optical vortices around this core. Basing on our analysis, we have demonstrated that, even with small Burgers vectors and intermediate values of piezooptic coefficients, the edge dislocation can be detected in the polarized light using optical microscopes

Keywords: crystalline structure, edge dislocations, optical indicatrix, topological defects

PACS: 42.50.Tx, 78.20.Fm, 42.50.-p, 78.20.hb, 61.50.-f, 61.72.Ff
UDC: 535.5+544.022.341.1
Ukr. J. Phys. Opt. 16 138-146
doi: 10.3116/16091833/16/3/138/2015
Received: 19.06.2015

Анотація. У роботі проаналізовано вплив крайових структурних дислокацій у кристалах на топологію параметрів оптичної індикатриси. Показано, що врахування строгих граничних умов приводить до занулення компонент тензора механічних напружень і, як наслідок, оптичного двопроменезаломлення в околі серцевини дислокації, забезпечуючи точні умови для генерації оптичних вихорів зі світловим кільцем навколо ядра дислокації. Продемонстровано, що навіть за умов малих векторів Бюргерса і проміжних значень п’єзооптичних коефіцієнтів крайові дислокації можна виявити в поляризованому світлі з використанням оптичного мікроскопа. 
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