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Proceedings Paper

Complex field-induced nematic defect structures in Laguerre-Gaussian optical tweezers
Author(s): Slobodan Žumer; Tine Porenta; Miha Ravnik
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Paper Abstract

Complex optical field-induced defect structures are presented in nematic and chiral nematic liquid crystals, as imprinted by Laguerre–Gaussian (LG) laser beams. Our modeling study is based on the phenomenological free energy approach, which dielectrically couples the nematic optical axis with the polarization of the LG beams. The symmetry of the presented structures proves to be conditioned by the beam helical indices. The beam intensity, strength of the nematic elastic constant, and local intensity-induced control of the nematic order via absorption of the light are demonstrated as possible mechanisms for producing, imprinting, and tuning of the field-induced complex defect structures in achiral and chiral nematics.

Paper Details

Date Published: 11 October 2012
PDF: 7 pages
Proc. SPIE 8475, Liquid Crystals XVI, 84750V (11 October 2012); doi: 10.1117/12.930450
Show Author Affiliations
Slobodan Žumer, Univ. of Ljubljana (Slovenia)
Jozef Stefan Institute (Slovenia)
Ctr. of Excellence NAMASTE (Slovenia)
Tine Porenta, Univ. of Ljubljana (Slovenia)
Miha Ravnik, Univ. of Ljubljana (Slovenia)
Ctr. of Excellence NAMASTE (Slovenia)

Published in SPIE Proceedings Vol. 8475:
Liquid Crystals XVI
Iam Choon Khoo, Editor(s)

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