Laser manipulation and characterization of liquid crystal droplets

被引:2
|
作者
Murazawa, Naoki [1 ]
Juodkazis, Saulius
Misawa, Hiroaki
机构
[1] JST, CREST, CRIS Bldg,North 21 West 10, Sapporo, Hokkaido 0010021, Japan
来源
OPTICAL TRAPPING AND OPTICAL MICROMANIPULATION III | 2006年 / 6326卷
关键词
laser trapping/manipulation; laser-tweezers; two- and three-photon absorption; molecular reordering; liquid crystals;
D O I
10.1117/12.685058
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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 similar to 60 MW/cm(2) intensity.
引用
收藏
页数:9
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