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

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationComplex Light and Optical Forces VI
DOIs
StatePublished - 2 Mar 2012
EventComplex Light and Optical Forces VI - San Francisco, CA, United States
Duration: 25 Jan 201226 Jan 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8274
ISSN (Print)0277-786X

Conference

ConferenceComplex Light and Optical Forces VI
CountryUnited States
CitySan Francisco, CA
Period25/01/1226/01/12

Keywords

  • 4′-n-pentyl-4-cyanobiphenyl
  • laser trapping
  • liquid crystal droplets
  • polarization optical microscopy
  • wide-field illumination

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