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Proceedings Article

Effects of eliminating the chain extender and varying the grating periodicity on the morphology of holographically written Bragg gratings

[+] Author Affiliations
Timothy J. Bunning

Science Applications International (USA)

Lalgudi V. Natarajan, Vincent P. Tondiglia, Richard L. Sutherland

Science Applications International Corp. (USA)

Robert Haaga, W. Wade Adams

Air Force Wright Lab. (USA)

Proc. SPIE 2651, Liquid Crystal Materials, Devices, and Applications IV, 44 (March 11, 1996); doi:10.1117/12.235361
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From Conference Volume 2651

  • Liquid Crystal Materials, Devices, and Applications IV
  • Ranganathan Shashidhar
  • San Jose, CA | January 28, 1996

abstract

Experimental variables affecting the morphology of holographically written Bragg gratings in polymer dispersed liquid crystalline composite systems are discussed. The spatial anisotropic photo-crosslinking of a multifunctional acrylate monomer results in periodic regions of phase separated LC droplets. These films have many electro-optic applications owing to the fact their refractive index profiles can be modulated. Low-voltage high resolution scanning electron microscopy (LVHRSEM) was used to investigate the morphology of these films due to the very small LC domain sizes formed. Specifically, the morphology is discussed in terms of the rates of LC diffusion parallel to the grating vector, and the relative rates of nucleation and subsequent gelation. Using micrographs, the effect of writing intensity, LC content, and chain extender concentration is examined first in uniformly illuminated (flood lit) samples and then in transmission gratings. Elimination of the chain extender increases the gelation time relative to the nucleation time resulting in larger LC domains. The effect of increasing the Bragg spacing on the phase separation behavior is also examined.

© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Timothy J. Bunning ; Lalgudi V. Natarajan ; Vincent P. Tondiglia ; Richard L. Sutherland ; Robert Haaga, et al.
"Effects of eliminating the chain extender and varying the grating periodicity on the morphology of holographically written Bragg gratings", Proc. SPIE 2651, Liquid Crystal Materials, Devices, and Applications IV, 44 (March 11, 1996); doi:10.1117/12.235361; http://dx.doi.org/10.1117/12.235361


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