Investigation of enhancement of photoinduced reorientation of liquid-crystal molecules in the presence of azo-dye and gold nanoparticlesP. Karpinski and A. Miniewicz
Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology - Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland, EU
received 25 September 2009; accepted in final form 13 November 2009; published December 2009
published online 11 December 2009
The optical-Kerr-effect configuration is used to study the enhancement of photo-induced molecular reorientation in a twisted nematic liquid crystal due to the presence of metal nanoparticles. The system consisting of a liquid crystal with photoisomerizable dye Disperse Orange 3 shows an enhancement of the Kerr-like response at 532 nm excitation light when doped with 15 nm in size gold nanoparticles. A simple theoretical model predicting the behavior and magnitude of the expected response has been formulated. The contribution of localized surface plasmon of gold nanoparticles to light-induced torque is discussed.
61.30.-v - Liquid crystals.
42.65.-k - Nonlinear optics.
77.84.Nh - Liquids, emulsions, and suspensions; liquid crystals.
© EPLA 2009