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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 14 — Jul. 7, 2008
  • pp: 10617–10632

Realignment-enhanced coherent anti-Stokes Raman scattering and three-dimensional imaging in anisotropic fluids

Aliaksandr V. Kachynski, Andrey N. Kuzmin, Paras N. Prasad, and Ivan I. Smalyukh  »View Author Affiliations

Optics Express, Vol. 16, Issue 14, pp. 10617-10632 (2008)

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We apply coherent anti-Stokes Raman Scattering (CARS) microscopy to characterize director structures in liquid crystals. We demonstrate that the polarized CARS signal in these anisotropic fluids strongly depends on alignment of chemical bonds/molecules with respect to the collinear polarizations of Stokes and pump/probe excitation beams. This dependence allows for the visualization of the bond/molecular orientations via polarized detection of the CARS signal and thus for CARS polarization microscopy of liquid crystal director fields, as we demonstrate using structures in nematic, cholesteric, and smectic liquid crystals. On the other hand, laser-induced director realignment at powers above a well-defined threshold provides the capability for all-optical CARS signal enhancement in liquid crystals. Moreover, since the liquid crystalline alignment can be controlled by electric and magnetic fields, this demonstrates the feasibility of CARS signal modulation by applying external fields to these materials.

© 2008 Optical Society of America

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(160.3710) Materials : Liquid crystals
(180.6900) Microscopy : Three-dimensional microscopy
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering

ToC Category:

Original Manuscript: April 29, 2008
Revised Manuscript: June 9, 2008
Manuscript Accepted: June 11, 2008
Published: July 1, 2008

Virtual Issues
Vol. 3, Iss. 8 Virtual Journal for Biomedical Optics

Aliaksandr V. Kachynski, Andrey N. Kuzmin, Paras N. Prasad, and Ivan I. Smalyukh, "Realignment-enhanced coherent anti-Stokes Raman scattering and three-dimensional imaging in anisotropic fluids," Opt. Express 16, 10617-10632 (2008)

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