The European Physical Journal E

, 35:33

Light-induced changes of the refractive indices in a colloid of gold nanoparticles in a nematic liquid crystal

  • D. Lysenko
  • E. Ouskova
  • S. Ksondzyk
  • V. Reshetnyak
  • L. Cseh
  • G. H. Mehl
  • Y. Reznikov
Regular Article

DOI: 10.1140/epje/i2012-12033-x

Cite this article as:
Lysenko, D., Ouskova, E., Ksondzyk, S. et al. Eur. Phys. J. E (2012) 35: 33. doi:10.1140/epje/i2012-12033-x

Abstract

It was shown that irradiation of a nematic liquid crystal doped with metal nanoparticles in the visible near the plasmon resonance band led to strong thermal changes of the refractive indices. The effect was studied by recording of dynamic optical gratings in the colloid. Nanoparticles “worked” as effective nano-heaters in a matrix causing the order parameter decrease around the particles. A large nonlinearity parameter (n2 ≈ 10-2 cm2/kW and fast response (≈ 0.7 ms), with no detectable particles’ aggregation and excellent photo- thermo-stability make these colloids potentially attractive nonlinear optical media. Application of a dynamic holography technique allowed measuring the coefficients of thermal conductivity of the liquid crystal along the director k|| = (0.4 ± 0.02) W m−1K−1 and perpendicular to the director k = (0.2 ± 0.01) W m−1K−1.

Keywords

Soft Matter: Liquid crystals

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • D. Lysenko
    • 1
  • E. Ouskova
    • 1
    • 2
  • S. Ksondzyk
    • 1
  • V. Reshetnyak
    • 3
  • L. Cseh
    • 4
  • G. H. Mehl
    • 4
  • Y. Reznikov
    • 1
  1. 1.Institute of PhysicsNational Academy of Sciences of UkraineKyivUkraine
  2. 2.Department of Applied PhysicsAalto University School of ScienceEspooFinland
  3. 3.National Taras ShevchenkoUniversity of KyivKyivUkraine
  4. 4.Department of ChemistryUniversity of HullHullUK