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Lasing in a hybrid-aligned cholesteric

1Nastishin Yu.A., 2Dudok T.H., 1Hrabchak V.I., 3Lychkovskyy E., 1Yakovlev M.Yu.,  1Vankevych  P.I., 4Meyer C. and 5Pansu B.

1Hetman Petro Sahaidachnyi National Army Academy, 32 Heroes of Maidan Street, 79012 Lviv, Ukraine
2Vlokh Institute of Physical Optics, 23 Dragomanov Street, 79005 Lviv, Ukraine
3Lviv Danylo Halytsky National Medical University, 69 Pekarska Street, 79010 Lviv, Ukraine
4Laboratoire de Physique des Systemes Complexes, Universite de Picardie, Jules Verne, 33 rue Saint-Leu, 80039 Amiens, France
5Laboratoire de Physique de Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Orsay F-91405, France

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Abstract. Optically pumped laser generation at a long-wavelength edge of cholesteric photonic bandgap is detected in a dye-doped cholesteric cell with a hybrid alignment, where long axes of cholesteric molecules are parallel to one of the substrates and perpendicular to the opposite substrate in its close vicinity. The hybrid director alignment in the cell is confirmed by polarization optical microscopy observations in both reflection and transmission modes.

Keywords: lasing in liquid crystals, photonic bandgap, polarization optical microscopy, liquid crystal textures, hybrid director alignment

PACS: 42.55.Zz 
UDC: 538.958+681.7.069.24
Ukr. J. Phys. Opt. 18 121-130
doi: 10.3116/16091833/18/3/121/2017
Received: 26.05.2017

Анотація. Зареєстровано лазерну генерацію на довгохвильовому краю фотонної щілини холестерика при оптичному нагнітанні легованої барвником холестеричної комірки, яка задає гібридну орієнтацію так, що молекули холестерика паралельні до підкладки поблизу однієї з підкладок, але перпендикулярні поблизу іншої підкладки. Гібридну орієнтацію в комірці підтверджено спостереженнями в поляризаційному оптичному мікроскопі в режимах пропускання та відбивання
 
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