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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 8 — Aug. 1, 2006
  • pp: 1712–1717

Longitudinally modulated nematic bandgap structure

Hakob Sarkissian, Boris Ya. Zeldovich, and Nelson Tabiryan  »View Author Affiliations

JOSA B, Vol. 23, Issue 8, pp. 1712-1717 (2006)

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We discuss a planar nematic liquid-crystal structure with the director periodically twisted in the light propagation direction (periodically twisted nematic) as a medium, which exhibits bandgap and strong reflection for any polarization at normal incidence. This is in contrast to the cholesteric liquid crystals, which reflect only one of the two circular polarizations. The size of the bandgap depends on the modulation profile and amplitude, and its maximal magnitude is smaller, but of the same order as the bandgap of cholesterics with similar material parameters (refractive indices and pitch). The second-order bandgap reflection exhibits polarization universality only for large enough modulation.

© 2006 Optical Society of America

OCIS Codes
(160.3710) Materials : Liquid crystals
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Photonic Crystals

Original Manuscript: January 13, 2006
Revised Manuscript: March 14, 2006
Manuscript Accepted: March 20, 2006

Hakob Sarkissian, Boris Ya. Zeldovich, and Nelson Tabiryan, "Longitudinally modulated nematic bandgap structure," J. Opt. Soc. Am. B 23, 1712-1717 (2006)

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