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Proceedings Paper

Laser manipulation and characterization of liquid crystal droplets
Author(s): Naoki Murazawa; Saulius Juodkazis; Hiroaki Misawa
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Paper Abstract

We demonstrate laser manipulation of different nematic and smectic liquid crystal droplets in heavy water. Peculiarities of laser trapping and manipulation depending on the molecular structure of liquid crystal are discussed. Possibility of molecular reordering inside the tweezed droplet is demonstrated. This phenomenon can be used to induce the birefringence and to manipulate droplets, which have a small birefringence, e.g., a radial droplet of negligible birefringence can be turned into a birefringent one at high laser trapping power. This is a demonstration of the optical nonlinear effect being responsible for a micro-mechanical phenomenon such as spinning of the droplet in a circularly polarized laser tweezers. Three-photon absorption of MBAPB dye at 1064 nm wavelength is demonstrated inside the liquid crystal droplet at comparatively low ~60 MW/cm2 intensity.

Paper Details

Date Published: 11 September 2006
PDF: 9 pages
Proc. SPIE 6326, Optical Trapping and Optical Micromanipulation III, 632630 (11 September 2006); doi: 10.1117/12.685058
Show Author Affiliations
Naoki Murazawa, CREST-JST (Japan)
Hokkaido Univ. (Japan)
Saulius Juodkazis, CREST-JST (Japan)
Hokkaido Univ. (Japan)
Hiroaki Misawa, CREST-JST (Japan)
Hokkaido Univ. (Japan)

Published in SPIE Proceedings Vol. 6326:
Optical Trapping and Optical Micromanipulation III
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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