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2 Opto-Electronics Review

2 2009

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Liquid-crystalline properties of 4-alkyl-, 4-alkyloxy and 4-halogene-4'-hydroxyazobenzene alkyloates

Trzaska J., Galewski Z.

Opto-Electronics Review

2009

Vol. 17, No. 2

129-139

Twenty one esters, 4-alkyl-, 4-alkyloxy-, 4-nitro- and 4-halogene-4'-hydroxyazobenzne alkyloates have been synthesised. Basing on the DSC calorimetry and polarizing microscopy liquid- crystalline polymorphism was investigated. Five types of mesophases were identified: nematic, smectics A, C, F and unknown X (probably G).

Investigations of dynamic photorefractivity regime by optical polarizing microscopy

Agashkov A. V., Kovalev A. A., Parka J.

Opto-Electronics Review

2009

Vol. 17, No. 2

99-104

We present a technique, based on optical polarizing microscopy, and results of direct observation of the optical interference field effect on the transient domains excited by ac electric field in a nematic planar cell with photosensitive aligning layers. The light source used in a microscope operated in DC mode as well as in triggered pulse one. Obtained microscopic snapshots of transient domain structure confirmed our assumption of the transient domains reordering (trapping) by the low intensity optical interference field.