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27 September 2020
  » pubmed » pmid15525209

 Article overview

Laser trapping of small colloidal particles in a nematic liquid crystal: clouds and ghosts
I Musevic ; M Skarabot ; D Babic ; N Osterman ; I Poberaj ; V Nazarenko ; A Nych ;
Date 29 Oct 2004
Journal Phys Rev Lett, 93 (18), 187801
AbstractWe show that, contrary to intuition, small (< or =1 microm) transparent particles can be trapped and manipulated in a nematic liquid crystal using an intense laser beam, although their index of refraction is lower than both refractive indices of the surrounding birefringent fluid. Two mechanisms are identified that are responsible for this anomalous trapping: (i) surface-induced distortion of the birefringent media around the particle, creating a high-index "cloud" around the colloid, and (ii) laser-induced distortion or (partial) melting of a nematic, creating a ghost colloid.
Source PubMed, pmid15525209
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