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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Stephen A. Burns
  • Vol. 22, Iss. 12 — Dec. 1, 2005
  • pp: 2818–2826

Optical properties of electrohydrodynamic convection patterns: rigorous and approximate methods

Christian Bohley, Jana Heuer, and Ralf Stannarius  »View Author Affiliations


JOSA A, Vol. 22, Issue 12, pp. 2818-2826 (2005)
http://dx.doi.org/10.1364/JOSAA.22.002818


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Abstract

We analyze the optical behavior of two-dimensionally periodic structures that occur in electrohydrodynamic convection (EHC) patterns in nematic sandwich cells. These structures are anisotropic, locally uniaxial, and periodic on the scale of micrometers. For the first time, the optics of these structures is investigated with a rigorous method. The method used for the description of the electromagnetic waves interacting with EHC director patterns is a numerical approach that discretizes directly the Maxwell equations. It works as a space-grid–time-domain method and computes electric and magnetic fields in time steps. This so-called finite-difference–time-domain (FDTD) method is able to generate the fields with arbitrary accuracy. We compare this rigorous method with earlier attempts based on ray-tracing and analytical approximations. Results of optical studies of EHC structures made earlier based on ray-tracing methods are confirmed for thin cells, when the spatial periods of the pattern are sufficiently large. For the treatment of small-scale convection structures, the FDTD method is without alternatives.

© 2005 Optical Society of America

OCIS Codes
(230.1950) Optical devices : Diffraction gratings
(260.0260) Physical optics : Physical optics
(260.1180) Physical optics : Crystal optics

ToC Category:
Physical Optics

History
Original Manuscript: April 4, 2005
Manuscript Accepted: May 7, 2005
Published: December 1, 2005

Citation
Christian Bohley, Jana Heuer, and Ralf Stannarius, "Optical properties of electrohydrodynamic convection patterns: rigorous and approximate methods," J. Opt. Soc. Am. A 22, 2818-2826 (2005)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-22-12-2818

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