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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 10 — Apr. 1, 2010
  • pp: 1720–1727

Study of azo dye surface command photoalignment material for photonics applications

Sarik R. Nersisyan, Nelson V. Tabiryan, Diane M. Steeves, Brian R. Kimball, Vladimir G. Chigrinov, and Hoi Sing Kwok  »View Author Affiliations


Applied Optics, Vol. 49, Issue 10, pp. 1720-1727 (2010)
http://dx.doi.org/10.1364/AO.49.001720


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Abstract

We provide detailed quantitative characterization of sulfonic bisazodye SD1 as a photoalignment material for photonics applications. The reversibility of photoalignment was tested for transformations between planar and 90 ° twist orientation states in a liquid crystal (LC) cell using polarized UV light. No degradation was observed for 100 cycles of transformations. A given twist angle of the LC orientation was obtained in a single step, as well as in a sequence of gradually increasing angles. A hysteresis is revealed in the latter case for planar–twist–planar cycles. The material was used for obtaining patterned orientation of a LC polymer providing similarly good quality photoalignment for UV as well as visible light. High efficiency large area and high spatial frequency optical axis gratings (or, polarization gratings) were demonstrated on a polycarbonate substrate. We show the opportunity of obtaining photoalignment in a multilayer system with single exposure to a polarized light. Finally, we provide evidence of a positive feedback in the dynamics of photoalignment due to the orientational effect of an increasing number of aligned molecules.

© 2010 Optical Society of America

OCIS Codes
(160.0160) Materials : Materials
(160.3710) Materials : Liquid crystals
(160.5335) Materials : Photosensitive materials

ToC Category:
Materials

History
Original Manuscript: November 11, 2009
Manuscript Accepted: February 20, 2010
Published: March 23, 2010

Citation
Sarik R. Nersisyan, Nelson V. Tabiryan, Diane M. Steeves, Brian R. Kimball, Vladimir G. Chigrinov, and Hoi Sing Kwok, "Study of azo dye surface command photoalignment material for photonics applications," Appl. Opt. 49, 1720-1727 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-10-1720

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