Laser trapping-induced reconfiguration of individual smectic liquid crystal micro-droplet showing size-dependent dynamics

Anwar Usman; Wei-Yi Chiang; Takayuki Uwada; Hiroshi Masuhara

doi:10.1117/12.906305

10 February 2012 Laser trapping-induced reconfiguration of individual smectic liquid crystal micro-droplet showing size-dependent dynamics

Anwar Usman, Wei-Yi Chiang, Takayuki Uwada, Hiroshi Masuhara

Author Affiliations +

Proceedings Volume 8274, Complex Light and Optical Forces VI; 82740L (2012) https://doi.org/10.1117/12.906305
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

We present laser trapping behavior of individual smectic 4'-n-pentyl-4-cyanobiphenyl liquid crystalline micro-droplet dispersed in heavy water; in particular, laser trapping-induced molecular reconfiguration of the optically trapped droplet when the laser trapping power is above a definite threshold. The reconfiguration undergoes throughout the inside of the droplets even though their size is larger than the focal spot, and the threshold laser power depends on the droplet size. We propose that the reconfiguration mechanism involves optical reorientation at the focal volume competing with the droplet-liquid interfacial anchoring effect, leading to symmetry breaking throughout the inside of the optically confined droplet. With this mechanism, we qualitatively described the existence of the threshold power and the dependence of the threshold upon the droplet size.

Citation Download Citation

Anwar Usman, Wei-Yi Chiang, Takayuki Uwada, and Hiroshi Masuhara "Laser trapping-induced reconfiguration of individual smectic liquid crystal micro-droplet showing size-dependent dynamics", Proc. SPIE 8274, Complex Light and Optical Forces VI, 82740L (10 February 2012); https://doi.org/10.1117/12.906305

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